Spooky Snow May Make an Appearance in Parts of Ontario to Kick Off Halloween Week

/

NOTE: YOU CAN CLICK ON THE MAP TO OPEN A ZOOMABLE IMAGE

The month of October has mostly brought calm and mild conditions to Ontario, with temperatures occasionally climbing above seasonal averages and minimal precipitation. But as we approach the final days leading up to Halloween, colder air is making a return, setting the stage for a possible wintry “trick” in parts of the region.

GOOGLE AD (NOT ENDORSED BY INSTANT WEATHER)

This past week, temperatures in some areas reached the upper teens and even low 20s, but now a noticeable chill has settled in. Many spots across Southern and Northern Ontario are already experiencing single-digit highs as the warm air retreats.

As the weekend progresses, the cold will only deepen, with Sunday morning expected to bring temperatures near or just below freezing across the province. Afternoon highs will provide little relief, as most places in Central and Eastern Ontario will likely struggle to rise out of the single digits.

GOOGLE AD (NOT ENDORSED BY INSTANT WEATHER)

A Weak Weather System and a Chance of Snow

PRECIPITATION TYPE FOR SUNDAY EVENING - MAP FROM WEATHERBELL

On Sunday, a weak weather system will begin to make its way into Northeastern Ontario and eventually move toward Central Ontario by the afternoon. This will likely bring some light rain showers to areas like Sault Ste. Marie, Sudbury, North Bay, and Muskoka. As colder air continues to push southward after sunset, temperatures will drop quickly, setting the stage for a possible transition from rain to wet snow in the evening.

While surface temperatures are expected to stay just above freezing until after midnight, colder air moving in aloft may allow the rain to change to snow as the night progresses. Precipitation will gradually spread southeastward, reaching Bancroft, Kingston, and possibly the Ottawa area.

There is some uncertainty about whether Ottawa itself will see any snowflakes, as models suggest that a dry air pocket may limit snowfall, keeping the bulk of moisture just to the south.

GOOGLE AD (NOT ENDORSED BY INSTANT WEATHER)

Potential for Accumulation and a Hard Freeze

ESTIMATED MINIMUM TEMPERATURE ON MONDAY MORNING - MAP FROM WEATHERBELL

Temperatures will continue to drop overnight, leading to what is referred to as a “hard freeze” in areas like Sudbury, North Bay, Algonquin Park, and the Ottawa Valley. During a hard freeze, temperatures remain several degrees below freezing for extended periods, which could kill sensitive plants.

The drop in temperature may also allow for some light snow accumulation, with a dusting of 2-3 cm possible by Monday morning in some areas. Though not a significant amount, it could be enough to create slippery conditions on roads, making for a potentially slow and hazardous Monday morning commute.

Light flurries may linger across parts of Central and Eastern Ontario into late Monday morning, gradually tapering off around noon. With temperatures hovering close to the freezing mark throughout the day, any snow that does manage to accumulate will likely melt slowly. Motorists should remain cautious, as wet or slushy conditions could persist longer than usual.

GOOGLE AD (NOT ENDORSED BY INSTANT WEATHER)

Midweek Warm-Up on the Horizon

ESTIMATED DAYTIME HIGH TEMPERATURE ON WEDNESDAY - MAP FROM WEATHERBELL

For those hoping for a break from the cold, a warm-up is expected by midweek. By Tuesday, daytime highs in parts of Southwestern Ontario could rebound into the low to mid-20s, with the warmer air spreading to Central and Eastern Ontario by Wednesday.

However, the return of milder weather may be accompanied by some wet conditions. A fast-moving weather system is forecast to pass through Southern Ontario on Tuesday, bringing the potential for 15-30 mm of rainfall across Central and Eastern Ontario between late Tuesday and Wednesday.

While the exact track remains uncertain, some models suggest the rain may shift further north, potentially impacting the area differently than initially expected.

GOOGLE AD (NOT ENDORSED BY INSTANT WEATHER)

What’s in Store for Halloween?

ESTIMATED TEMPERATURE FOR HALLOWEEN AT 8 PM - MAP FROM WEATHERBELL

With Halloween fast approaching, many Ontarians are wondering what the weather will be like for Trick-or-Treating. As of now, forecasts indicate a chance of widespread rain across much of Southern Ontario during the afternoon, possibly lingering into the evening. Afternoon temperatures are expected to start in the mid to upper teens, but a cooling trend may bring them down to the low teens or even upper single digits by the time Trick-or-Treaters hit the streets.

There is still some disagreement among models regarding the exact timing of the rain. While it seems the heaviest precipitation may fall earlier in the day, there is a chance that skies could clear in time for the evening festivities, especially in Southwestern Ontario. Meanwhile, Eastern Ontario may be among the last regions to see any potential clearing.

Stay tuned as more details emerge in the days leading up to Halloween, and be prepared for whatever weather “tricks” or “treats” may come your way!

Trick-or-Treat: A Potential Spooky ‘Headless’ Comet Could Be Visible Across Canada Around Halloween

/

It's been a spectacular year for skywatchers across Canada, with events like solar eclipses, supermoons, and vibrant northern lights lighting up the night. Now, it looks like we might be in for another treat—a "headless" comet could make an appearance just in time for Halloween.

GOOGLE AD (NOT ENDORSED BY INSTANT WEATHER)

October seems to be the month of comets, with Comet Tsuchinshan-ATLAS gracing the early evening skies recently. Many stargazers caught glimpses of the comet, which was visible in the western sky just after sunset. Although it has since faded from naked-eye visibility, you can still catch it with a telescope, and it will remain somewhat visible into early November.

But the cosmic show isn’t over yet. A second comet, called Comet ATLAS (C/2024 S1), may arrive just in time for Halloween, and it comes with a spooky twist—it could appear "headless." The comet’s name might sound familiar because it was discovered by the same ATLAS asteroid tracking system, known for spotting objects that could potentially impact Earth.

GOOGLE AD (NOT ENDORSED BY INSTANT WEATHER)

The main difference between this upcoming comet and the earlier one lies in its path. While the first comet passed safely between Earth and the Sun, around 40 million miles from the Sun, this new comet will come much closer, potentially within 700,000 miles of the Sun's surface. Because of this close approach, scientists predict that the comet’s head—its bright core—might disintegrate due to the Sun's intense heat, leaving just a faint, trailing tail visible from Earth.

To understand what makes a comet appear "headless," it's important to know a bit about its structure. Comets are made up of a nucleus, or core, composed of rock, dust, and frozen gases. When they approach the Sun, the heat causes the frozen gases to vaporize, forming a glowing coma around the nucleus and a tail that extends away from the Sun. If the nucleus disintegrates, the glowing head might vanish, leaving behind only a ghostly tail, hence the term "headless comet."

GOOGLE AD (NOT ENDORSED BY INSTANT WEATHER)

ESTIMATED BRIGHTNESS OF COMET - SOURCE: sKYWALK.SPACE

The exact visibility of this comet remains uncertain. It will come closest to Earth on October 24th as it travels toward the Sun, reaching its closest point to the Sun, known as perihelion, on October 28th. There’s even a chance it could be bright enough to see during the day, potentially appearing as bright as Venus from 7:12 AM to 8:06 AM (ET) in the east-southeastern sky.

However, those in the Northern Hemisphere may struggle to spot it due to its position low in the sky near the Sun, making it difficult to see without obstruction from sunlight or clouds.

GOOGLE AD (NOT ENDORSED BY INSTANT WEATHER)

NASA offers some tips for spotting the comet during this close approach. To view it safely, you should block the Sun with an object such as a building or tree, then scan the lower left of the Sun's position in the sky. Be cautious and never use binoculars or telescopes, as accidentally focusing on the Sun can cause serious eye damage.

If the comet survives its close encounter with the Sun, it could become visible in the night sky around Halloween. This would provide skywatchers with a unique opportunity to see a potentially "headless" comet, with a long, wispy tail but no visible nucleus. The darkness of the moonless night sky could offer ideal conditions for observing this unusual celestial visitor, making it a fitting cosmic event for the spooky season.

GOOGLE AD (NOT ENDORSED BY INSTANT WEATHER)

There is always the possibility that the comet disintegrates completely, leaving nothing visible to the naked eye. But if it endures, it will gradually fade after November 1st, requiring binoculars or a telescope for further observation. Unlike earlier this month, when a supermoon washed out the sky, the absence of a full moon could make for an even more impressive show, assuming the comet survives.

Stay tuned for updates as we keep an eye on this intriguing comet.

Why the Northern Lights Are Appearing More Frequently: NASA and NOAA Confirm Solar Maximum

/

Visible light images from NASA’s Solar Dynamics Observatory highlight the appearance of the Sun at solar minimum (left, Dec. 2019) versus solar maximum (right, August 2024). During solar minimum, the Sun is often spotless. Sunspots are associated with solar activity, and are used to track solar cycle progress. Credit: NASA/SDO

During a recent teleconference, experts from NASA, NOAA, and the International Solar Cycle Prediction Panel confirmed that the Sun has entered its solar maximum, a period of heightened solar activity expected to last through the next year.

The solar cycle reaches this peak roughly every 11 years, during which the Sun shifts from a relatively calm state to a much more active phase characterized by increased magnetic activity and a higher number of sunspots. These sunspots, which are cooler areas on the Sun’s surface caused by intense magnetic fields, can trigger powerful solar eruptions that significantly impact space weather.

This surge in solar activity doesn’t just make for an interesting spectacle; it can also have practical consequences on Earth. Solar flares and eruptions during this time can interfere with communications, disrupt GPS signals, and even affect power grids. They can also pose potential hazards to satellites and astronauts in orbit.

But for skywatchers, there is an upside: the solar maximum period also brings more frequent and spectacular aurora displays. The increased solar storms energize the Earth’s magnetosphere, producing stunning Northern Lights that light up the night sky.

GOOGLE AD (NOT ENDORSED BY INSTANT WEATHER)

The Solar Cycle 25 forecast, produced by the Solar Cycle 25 Prediction Panel, which is co-chaired by NASA and NOAA. Sunspot number is an indicator of solar cycle strength - the higher the sunspot number, the stronger the cycle. Credit: NOAA’s Space Weather Prediction Center

This past May, a powerful series of solar flares and coronal mass ejections (CMEs) resulted in one of the most intense geomagnetic storms seen in decades, setting the stage for breathtaking aurora displays visible across Canada. For many, it was a rare opportunity to experience the vivid greens, reds, and purples dancing across the sky.

If you didn’t catch those May displays or other recent aurora events, there’s no need to worry. With the Sun currently in its solar maximum, NASA and NOAA anticipate ongoing solar and geomagnetic storms in the coming months, which means there will be many more chances to witness the auroras.

Although the Sun is already in an active phase, pinpointing the exact peak of this cycle will take time as scientists closely monitor the number and intensity of sunspots and solar eruptions.

GOOGLE AD (NOT ENDORSED BY INSTANT WEATHER)

Exciting research efforts are also underway to better understand the Sun's behavior during this dynamic period. NASA is preparing for a major milestone in solar exploration, with the Parker Solar Probe set to make its closest approach to the Sun in December 2024. This mission, along with other initiatives, aims to deepen our knowledge of space weather and its effects on our planet.

Here at Instant Weather, we’re committed to keeping you informed about significant solar activity and providing timely alerts for aurora viewing opportunities across Canada. As the Sun continues to show off during this solar maximum, be sure to stay tuned for updates and get ready for more spectacular light shows in the sky.

First Significant Snowfall of the Season Expected Across Alberta to Start the Week

/

NOTE: YOU CAN CLICK ON THE MAP TO OPEN A ZOOMABLE IMAGE

On the heels of some mild temperatures for the past week, a drastic cool down is already on its way courtesy of a strong cold front. Precipitation is expected along this cold front and unfortunately, the temperatures will dip low enough across much of Central and Southern Alberta for some of that precipitation to fall as snow, hitting the region in two rounds.

GOOGLE AD (NOT ENDORSED BY INSTANT WEATHER)

The cold front has already started to make its way through Alberta from the north, bringing single digit temperatures to areas north of Red Deer and a large band of precipitation behind it spanning the width of the province. Most of this precipitation has been falling as rain, but to the west, through Grande Cache and Grande Prairie, there has been light snow. The rain will transition to snow moving eastwards this evening and overnight as the temperatures continue to fall and a low pressure centre moves in from the west, pushing the front and its associated precipitation towards Saskatchewan.

South of this first round of snowfall, conditions will stay dry until late Monday morning when additional precipitation will push its way into the region from British Columbia, crossing eastward across Alberta through the afternoon and evening. With the passage of the expected low pressure centre and a second cold front, temperatures will actually drop throughout the day so a large swath of Southern Alberta will see precipitation start off as rain, but transition to snow later in the afternoon as the temperature continues to drop. The exception to this will be in the Rockies, where the precipitation is expected to fall predominantly as snow, leading to upwards of 20cm of snowfall accumulation.

Forecasting the exact amount of snowfall for this event has been tough because the temperatures will not fall too far below 0°C, only a few degrees in most places. Furthermore, the ground is still warm across much of the province, meaning that overall accumulation should be limited to just a few centimetres beyond the mountains. Despite this, roadways could still become slick, so make sure to exercise caution when travelling over the next couple of days.

After a Slow Start, Fall Colours Now Entering Peak Across Southern Ontario

/

NOTE: YOU CAN CLICK ON THE MAP TO OPEN A ZOOMABLE IMAGE

An unusually warm start to autumn across Southern Ontario has delayed the typical fall colour transformation, leaving many waiting longer than usual for those vibrant displays. In our last update from early October, peak colours had only been reached in Central Ontario and parts of Eastern Ontario, several weeks later than usual.

However, the colder weather that settled in over the past few weeks has helped speed up the transformation across the region. As we head into the weekend, most areas in Southern Ontario are now approaching or experiencing peak colour change.

GOOGLE AD (NOT ENDORSED BY INSTANT WEATHER)

For provincial parks that reached their peak earlier this month—such as Algonquin Park, Arrowhead, and Bonnechere—the best days have likely passed, with reports indicating that fewer than 40% of the leaves remain on the trees.

Note: The above map is extrapolated using data from OntarioParks.ca, but some parks may not have updated their latest report yet. As such, the actual colour change in your area may be further along than currently reported.

Keep in mind that many parks have closed for the season after Thanksgiving, which explains why some areas lack data in our latest updated map.

Currently, the following parks are experiencing peak fall colours:

  • Arrowhead: 100% colour change | 40% leaf fall

  • Balsam Lake: 60% colour change | 30% leaf fall

  • Batchawana Bay: 90% colour change | 40% leaf fall

  • Bon Echo: 80% colour change | 50% leaf fall

  • Bronte Creek: 50% colour change | 20% leaf fall

  • French River: 80% colour change | 50% leaf fall

  • Killarney: 80% colour change | 40% leaf fall

  • Killbear: 60% colour change | 30% leaf fall

  • MacGregor Point: 60% colour change | 40% leaf fall

  • Mark S. Burnham: 50% colour change | 40% leaf fall

  • Mono Cliffs: 60% colour change | 20% leaf fall

  • Oxtongue River-Ragged Falls: 100% colour change | 40% leaf fall

  • Sauble Falls: 100% colour change | 40% leaf fall

  • The Massasauga: 90% colour change | 20% leaf fall

The last regions still waiting to reach peak colours are in Deep Southwestern Ontario, along the Lake Erie shoreline, and in parts of the Golden Horseshoe. Parks in these areas, including Pinery, Wheatley, Rondeau, Turkey Point, Darlington, Presqu'ile, and Sandbanks, are reporting between 30-40% colour change. It's likely that these parks will reach peak colours by next weekend.

Remember that peak fall colours typically last for about a week or two, but this can vary based on weather conditions. The peak period ends once more than 50% of the leaves have fallen, which can happen quickly after a strong windstorm. So, make the most of the season and get out there while the colours are at their brightest!

Toronto’s Storm of the Century: Remembering Hurricane Hazel 70 Years Later

/

Overhead view of Raymore drive in Toronto following hurricane hazel, courtesy of Toronto and Region Conservation Authority.

It was on this day 70 years ago, in 1954, that the now infamous Hurricane Hazel hit Southern Ontario and caused catastrophic damage to Toronto. It is considered the area’s worst natural disaster and has shaped development for years to come. The storm produced winds up to 124km/h and dumped over 200mm of rain in just 24 hours; left 81 people dead and over 4000 families homeless, 1868 of those families in Toronto; and caused over $135 million in damages in Ontario ($1.5 billion by today’s standards). Hazel changed the way conservation authorities operate across Ontario and those impacts are still felt to this day.

GOOGLE AD (NOT ENDORSED BY INSTANT WEATHER)

Hurricane Hazel's Path, October 14-15, 1954, Courtesy of the National Weather Service.

Hurricane Hazel was first identified on October 5, 1954 by a Hurricane Hunters aircraft from Puerto Rico which located it just east of the island nation of Grenada in the West Indies. The plane estimated that the storm was already a Category 2 hurricane with winds estimated at 160km/h, but this value was more recently revised to 105km/h, making Hazel a Tropical Storm at the time, during reanalysis of former hurricane seasons by NOAA. Hazel intensified following the Hurricane Hunters mission and it made its first landfall over Grenada on the evening of the 5th as a Category 1 hurricane with winds estimated at 120km/h.

From there, Hazel tracked west-northwestward off the northern coast of Venezuela for the next few days, gaining strength along the way. Late on October 9th, Hazel gained Major Hurricane status with winds estimated at 195km/h. The next day, the storm made a sharp turn and started churning northeastward, where it eventually made two separate landfalls on Haiti’s west coast, initially over the Tiberon Peninsula as a Category 3 with winds estimated at 195km/h in the pre-dawn hours on the 12th and then as a Category 2 with estimated winds of 160km/h later that same evening over the northern peninsula. Hurricane Hazel killed up to 1000 people in Haiti and devastated the economy, destroying 40% of the nation’s coffee trees and 50% of the cacao crop.

Following its second landfall in Haiti, Hurricane Hazel curled northwestward and made its fourth total landfall in Inagua, an island in the Bahamas, less than 18 hours later on the morning of the 13th. The storm maintained its Category 2 strength between the two landfall occurrences, hitting the Bahamas with winds estimated at 160km/h.

Beyond the Bahamas, Hazel gained speed and reintensified, becoming a Category 4 hurricane on the evening of October 14th. Just before noon on October 15th, Hazel made its fifth and final landfall near the border of North Carolina and South Carolina as a Category 4 hurricane with sustained winds of 215km/h and gusts up to 240km/h. Hazel quickly transitioned to a post-tropical cyclone, but it maintained hurricane-force winds as it quickly pushed through D.C., Pennsylvania, New York, and towards the Canadian border. The storm killed 95 Americans and caused over $1.5 billion of damage by today’s standards.

GOOGLE AD (NOT ENDORSED BY INSTANT WEATHER)

Surface Chart from 8:3pm ET showing the location of Hazel over Southern Ontario, Courtesy of the National Weather Service.

As Hazel made its way northward through the States, Canadian authorities began issuing warnings to the general public, but most people didn’t know how to prepare for a hurricane. The storm began to weaken over the Allegheny Mountains in West Virginia and meteorologists expected it to dissipate, however the opposite happened. Instead, Hazel encountered a low-pressure system over western New York and intensified just before it crossed into the Niagara Peninsula.

Hurricane Hazel was a post-tropical Category 1 storm that brought severe wind gusts of up to 124km/h to a large portion of Southern Ontario on October 15th, but the winds were not the main concern from the storm. By the evening rush hour, the winds began to die down, but according to Chief Meteorologist Brian Turnbull, the worst of the storm was yet to come. The days leading up to Hazel’s arrival were quite wet so when the heavy rainfall began in the late afternoon, it didn’t take long for flooding to begin. Significant deforestation and development on the saturated flood plains across Toronto could not contain the over 200mm of rain that fell in 24 hours which resulted in many rivers overtopping their banks, with water levels rising by up to 8 metres. The Humber River, in particular, became a deadly torrent through the city, washing away roads, bridges, and entire homes. Overall, the storm dumped 181.6 billion litres of rain on the City of Toronto.

In total, 81 people lost their lives from Hurricane Hazel, mostly in the west end of Toronto. Across Southern Ontario, approximately 4000 families lost their homes, 1868 of which were in Toronto. Raymore Drive was hit particularly hard with 14 homes being washed away, killing 35 people. Fortunately, the death toll could have been much worse if not for the heroics displayed by many police officers, firefighters, and ordinary citizens who worked tirelessly trying to save those who became stranded. Sadly, five firefighters lost their lives when trying to rescue trapped motorists.

The effects of Hurricane Hazel were felt beyond Toronto. Significant flooding was experienced in communities as far west as London and north to Georgian Bay as the storm progressed northwards to James Bay, where it eventually dissipated.

Members of the Harbour Patrol Rescue a man from the Don River, courtesy of the Canadian Encyclopedia.

GOOGLE AD (NOT ENDORSED BY INSTANT WEATHER)

In the aftermath of Hurricane Hazel, many changes were made to conservation authorities across Ontario, especially in the Greater Toronto Area.

An intensive plan was put in place by conservation authorities, along with both the municipal and provincial governments, for flood control and water conservation in order to limit loss of life and property from future extreme weather events. As part of this plan, flood control facilities were inspected, upgraded, or built alongside additional dams and reservoirs to control and monitor water levels. A flood forecasting and warning system was also a large component to the plan.

An amendment was made to the Conservation Authorities Act that allowed individual conservation authorities to obtain and control vulnerable areas to be used for conservation and recreation. As a result, many homes were cleared from low-lying areas and greenbelts were created within watersheds. This included the expropriation of most remaining properties on Raymore Drive by the Metro Toronto and Region Conservation Authority which was turned into parkland, now called Raymore Park.

As we look back on the anniversary of this tragic event, we want to remember those that were lost and all of the efforts that have been put in place since to prepare for future extreme weather events. The City of Toronto has seen many flooding events since Hurricane Hazel, and it will continue to do so for many year. However, major floods in 2013 and more recently in 2024 show that more work still needs to be done.

The G. Ross Lord Dam, One of the Many Flood Control Measures in Place Across Toronto, Courtesy of the Toronto and Region Conservation Authority.

Sources:

https://www.aoml.noaa.gov/hrd/hurdat/hurdat2.html

https://www.heritage-matters.ca/articles/hurricane-hazel-50-years-later

https://www.heritagetrust.on.ca/pages/programs/provincial-plaque-program/provincial-plaque-background-papers/hurricane-hazel

https://www.hurricanehazel.ca/ssi/evolution_flood_control.shtml

https://www.thecanadianencyclopedia.ca/en/article/toronto-feature-hurricane-hazel

https://www.thecanadianencyclopedia.ca/en/article/hurricane-hazel

https://www.trca.ca/news/hurricane-hazel-70-years/

https://www.weather.gov/mhx/Oct151954EventReview

Post-Thanksgiving Cool Down to Bring Season’s First Flurries to Parts of Southern Ontario on Tuesday

/

NOTE: YOU CAN CLICK ON THE MAP TO OPEN A ZOOMABLE IMAGE

The chill is definitely in the air following the Thanksgiving long weekend across Ontario, with overnight lows hovering around the freezing mark in many areas over the past few days.

This is a sharp change from the mild autumn weather we experienced throughout September, which has led to a noticeable delay in the changing of the leaves. While the trees are still taking their time to show off their fall colors, other signs of the season are on the way over the next few days.

Most notably, the combination of colder air and the warm waters of the Great Lakes will create ideal conditions for lake-effect precipitation to develop off Lake Huron and Georgian Bay.

While most areas will see lake-effect rain, it could get cold enough along the higher elevations of the Dundalk Highlands, south of Georgian Bay, for some wet flurries to appear on Tuesday.

GOOGLE AD (NOT ENDORSED BY INSTANT WEATHER)

Additional precipitation is expected to move into Northeastern and Central Ontario by late Tuesday. As temperatures approach the freezing mark, some areas may see a transition to wet snow. However, significant accumulation is not expected, as the snow will likely melt almost immediately due to the warm ground, which remains above freezing.

For those who miss the milder weather, there’s no need to worry—there’s a warm-up on the way as we head into the weekend and early next week. Some areas could see daytime highs reaching the upper teens or even low twenties, which is well above the seasonal average for this time of year.

PRECIPITATION TYPE DURING THE DAY ON TUESDAY - MAP FROM WEATHERBELL

On Tuesday morning, most places will wake up to temperatures near the freezing mark, but daytime highs are expected to gradually rise into the mid to upper single digits. The higher elevations around Orangeville and Shelburne may struggle to climb above freezing, holding onto near-freezing temperatures throughout the day.

Lake-effect rain is expected to continue south of Georgian Bay throughout Tuesday, and some wet snow could mix in over the Dundalk Highlands during the day. This potential for flurries will be highly localized to the higher elevations between Owen Sound and Orangeville, while areas outside this region are likely to avoid the season’s first snowfall for now.

With temperatures hovering near or just above the freezing mark, significant accumulation is unlikely, as most of the snow will melt upon contact with the ground. However, there is a chance of a few wet, slushy centimeters in very localized areas.

GOOGLE AD (NOT ENDORSED BY INSTANT WEATHER)

PRECIPITATION TYPE DURING TUESDAY night - MAP FROM WEATHERBELL

As we move into the evening and overnight hours, temperatures will again drop to near the freezing mark across Central, Eastern, and Northeastern Ontario. With scattered showers arriving from the north and east, there is a possibility that some of this precipitation could fall as wet flurries overnight and into early Wednesday morning.

Accumulation will remain a challenge due to the relatively warm ground. However, those in Huntsville, Algonquin Park, and the Ottawa Valley might catch a glimpse of their first snowflakes of the season. The chance of snow will diminish by late Wednesday morning as lake-effect precipitation weakens and any lingering showers move out of the region.

As mentioned earlier, we’re expecting a gradual warm-up for the rest of the week, though the mornings will still start off chilly, with temperatures in the single digits. The real warming trend will kick off on Friday, with temperatures climbing into the upper teens and possibly even approaching the low twenties in Southwestern Ontario and around the Golden Horseshoe.

This milder weather is expected to continue through the weekend and into early next week.

Storm of the Century for Tampa and Central Florida; Catastrophic Hurricane Milton Will Make Landfall Tonight

/

Satellite Image of Hurricane Milton from October 8th at 10:30PM EDT, Courtesy of Colorado State University.

Hurricane Milton managed to maintain its status as a Category 5 hurricane overnight and has since been downgraded to a still catastrophic Category 4. Milton has finally started to encounter some shear that began to change its structure and will cause the storm to weaken. The shear is expected to increase throughout the day, weakening the storm further, but it is still expected to be a powerful Category 3 hurricane upon landfall later tonight. Current projections have landfall occurring at around 1am with maximum sustained winds of 125 mph (201 km/h).

There have also been continued southward wobbles in Milton's track and this has pushed the potential landfall location further south. The margin of error is approximately 20 miles at this point, so the exact location of landfall is starting to become a bit clearer. Regardless of where the storm eventually makes landfall, the shear will cause the storm to grow and the devastating impacts will be widespread. This is the first hurricane to directly impact the Tampa area since 1921, making Hurricane Milton the storm of the century for the region.

GOOGLE AD (NOT ENDORSED BY INSTANT WEATHER)

Reflectivity from the Tampa Bay Radar Station on October 9th at 11:40AM EDT.

The eye of the hurricane is now visible on both Key West and Tampa Bay radars and we've already begun to see significant rainfall moving inland in Central Florida. Current rainfall totals for the Tampa area are in the 1-2 inch (25-50mm) range, but with the heaviest bands of rain just starting to come ashore, these numbers will jump.

Widespread flooding remains a major concern across central and northern portions of the Florida Peninsula, with localized rainfall totals potentially reaching 18 inches (457 mm). These heavy rains will push far inland and elevate the risk of flash flooding over a large part of the state, especially in low-lying areas and along rivers. The Weather Prediction Center (WPC) continues to forecast a High Risk (their highest level) for flash flooding across a large swath of Central Florida that includes Tampa and Orlando.

We've also seen several tornado warnings and confirmed tornadoes south of Lake Okeechobee. Tornadoes are a major threat when hurricanes approach shore from the many imbedded thunderstorms and the potential for more tornadoes will continue into the afternoon and expanding northward with the overall motion of the hurricane.

GOOGLE AD (NOT ENDORSED BY INSTANT WEATHER)

Tropical storm-force winds are started to make their way over land with the rain this morning and they will gradually spread further inland throughout the day as the storm makes its final approach and the increased shear causes the wind field to grow. The area of hurricane-force winds will also become larger, but since they are found closer to the eye, they won’t be felt inland until closer to landfall.

The continued southern shift that's been seen in Hurricane Milton's track has also shifted where the greatest storm surge is expected. The greatest peak storm surge of 10-15ft is now forecasted along the coast from Anna Maria Island to Boca Grande. The forecast for Tampa Bay has been downgraded to 8-12ft, but this is still a life-threatening amount of water.

With a little over 12 hours until landfall, there is very little time left for those in the path to make their final preparations. If you or your loved ones are in the storm’s potential path, it’s crucial to stay informed, heed evacuation orders if they are issued, and follow any directives from local emergency personnel. We will continue to provide updates throughout the day as Milton makes its final approach.

Peak Storm Surge Forecast in FLorida for Hurricane Milton, Courtesy of The National Hurricane Center.

Florida Braces for Catastrophic Landfall of Hurricane Milton; Potential to be the Most Destructive Hurricane on Record for the State

/

Satellite Image of Hurricane Milton from October 8th at 2:21PM EDT, Courtesy of National Hurricane Center.

Following its almost unprecedented intensification from a Tropical Storm to a Category 5 hurricane and becoming the 5th most intense Atlantic hurricane on record, Milton’s development was stunted overnight while undergoing an eyewall replacement cycle. During this, the inner structure of the storm changed significant, with the eye filling in and the wind field expanding. The peak winds fluctuated and Milton was downgraded to a Category 4 hurricane this morning.

With the eyewall replacement complete, the eye cleared and shrunk in size, marking the possibility it might regain some of its slight loss in strength and achieve Category 5 status once again. The latest Hurricane Hunter recon mission estimates that Milton is just shy of the threshold of becoming a Category 5 hurricane with maximum sustained winds of 155 mph (250 km/h). However, continued structural changes over the next 24 hours will result in further fluctuations in strength.

GOOGLE AD (NOT ENDORSED BY INSTANT WEATHER)

Forecast Track for Hurricane Milton, Courtesy of The National Hurricane Center.

Hurricane Milton continues its offshore passage of the Yucatan Peninsula, where it has brought significant damage to coastal areas. The storm has already made its predicted turn and begun moving northeastward into the heart of the Gulf, where it will increase its forward speed bringing it into Central Florida.

There has been very little change in the official forecast track from the National Hurricane Center (NHC), aside from the possibility that landfall might occur just south of Tampa Bay. This slight change is of little consequence because even at 24-36 hours out, the NHC forecasts have of a margin of error 60-70 miles so it is still difficult to pinpoint exactly where landfall will occur. Furthermore, Milton and its wind field are still projected to grow in size as the storm encounters vertical wind shear ahead of landfall. The area of hurricane and tropical storm-force winds is expected to double in size, spreading the threats of life-threatening surge, heavy rains, and destructive winds far beyond the forecast cone.

The NHC’s storm surge forecast for the Anclote River to Englewood, including Tampa Bay, has been increased to 10-15ft and could be double that from Hurricane Helene two weeks ago. With the area still recovering from storm surge damage that resulted from Helene, large piles of debris can be found all along the coast, posing a very unique threat. Not only will some of the debris get washed back inland with the storm surge, the hurricane-force winds could easily turn these remnants into dangerous projectiles when the storm hits.

GOOGLE AD (NOT ENDORSED BY INSTANT WEATHER)

In addition to the threat of storm surge and intense winds, central and northern portions of Florida Peninsula could see 5-12 inches (127-305 mm) of rainfall, with localized totals potentially reaching 18 inches (457 mm). These heavy rains will push far inland and elevate the risk of flash flooding over a large part of the state, especially in low-lying areas and along rivers. The Weather Prediction Center (WPC) has issued a High Risk (their highest level) for flash flooding across a large swath of Central Florida that includes Tampa and Orlando.

After landfall, Milton is expected to track across the Florida Peninsula and emerge into the Atlantic, where it will briefly remain a hurricane before transitioning into a post-tropical storm. However, the impacts to Florida and surrounding areas will be significant long before the storm weakens.

Flash Flood Forecast in Florida from Hurricane Milton, Courtesy of The National Hurricane Center.

Milton’s rapid intensification has been fuelled by its movement through an area of deep, warm waters, with sea surface temperatures exceeding 28°C, providing ample energy for the storm. Additionally, low wind shear in the region has allowed the hurricane to strengthen unhindered. Thankfully, we began to see that development stall overnight with the eyewall replacement cycle. As it continues to approach Florida, Milton is still expected to encounter an area of shear that will weaken it further, but it will still be a powerful hurricane at landfall. The NHC forecast maintains that it could make landfall as a Category 3 hurricane, with maximum sustained winds of 125 mph (201 km/h). However, they have stated that this projection is on the high end of model guidances so there is the possibility of an adjustment to this forecast in the next 24 hours.

GOOGLE AD (NOT ENDORSED BY INSTANT WEATHER)

The entire Florida Peninsula is now under a Tropical Storm or Hurricane Warning. Residents in the projected path are being urged to finalize their preparations while there is still time. Tropical storm-force winds are expected to arrive as early as tomorrow morning, with landfall projected overnight Wednesday. While uncertainty remains regarding Milton’s exact landfall location and strength, the potential for widespread heavy rainfall, destructive winds, and life-threatening storm surges is significant.

If you or your loved ones are in the storm’s potential path, it’s crucial to stay informed, heed evacuation orders if they are issued, and follow any directives from local emergency personnel. We will continue to provide updates as more information becomes available, so stay tuned. Your safety is the priority as Hurricane Milton approaches.

Forecast Track and Intensity of Hurricane Milton with Sea Surface Temperatures, courtesy of Tomer Burg.

Milton Rapidly Intensifies into Dangerous Category 5 Hurricane; Threatens to Slam into Tampa Bay, Florida on Wednesday

/

Satellite Image of Hurricane Milton from October 7th at 11:59am EDT, Courtesy of Colorado state university.

In a remarkable and alarming turn of events, Hurricane Milton has rapidly intensified from a Category 1 to a Category 5 hurricane within just 18 hours, marking one of the most rapid intensifications on record in the Atlantic. Only Hurricane Wilma intensified faster, strengthening in just 12 hours back in 2005. Such an extreme escalation underscores the potential danger of this storm as it continues to grow in strength.

Data gathered by Hurricane Hunter aircraft earlier this morning estimated that Milton’s maximum sustained winds were around 160 mph (257 km/h), making it the second hurricane this season to reach Category 5 intensity, following Hurricane Beryl in July. However, more recent data now indicates that Milton’s winds have increased even further to 175 mph (282 km/h), with a minimum central pressure of 911mb, making it the strongest Atlantic hurricane since Dorian in 2019. These numbers highlight just how powerful Milton has become in such a short span of time.

GOOGLE AD (NOT ENDORSED BY INSTANT WEATHER)

Forecast Track for Hurricane Milton, Courtesy of The National Hurricane Center.

Interestingly, Hurricane Milton did not follow its projected almost directly eastward path overnight. Instead, the storm has wobbled southeastward, bringing it much closer to the Northern Yucatan Peninsula than initially forecasted. As a result, Mexican authorities have issued Hurricane Warnings, anticipating hurricane-force winds to impact the region today. The shift in track has led to a stronger storm approaching the Yucatan, further complicating forecasts and increasing the potential for damage along the coast.

This unexpected change in Milton’s path has also influenced weather models and the official forecast track from the National Hurricane Center (NHC). Despite continued uncertainty regarding Milton’s precise path, the storm is now forecasted to make landfall further south than originally thought, with the Tampa Bay area now directly in its sights. The NHC predicts that Milton will curve northeastward later this afternoon, with an increase in forward speed, leading to a likely landfall on Wednesday evening.

Unfortunately, this is a worst-case scenario for Tampa Bay, as the region is still recovering from storm surge damage caused by Hurricane Helene less than two weeks ago. Now, with Milton’s stronger winds and greater storm surge, the area faces an even more dangerous situation. With plenty of loose debris still scattered along the coast, the hurricane-force winds could easily turn these remnants into dangerous projectiles when the storm hits. The NHC is currently forecasting storm surges of 8-12 feet from the Anclote River to Englewood, including Tampa Bay itself. Due to Milton’s angle of approach, the surge could be more severe than what was seen with Helene, posing an even greater threat to life and property.

In addition to storm surge concerns, much of the Florida Peninsula and the Florida Keys could see 5-10 inches (127-254 mm) of rainfall, with localized totals potentially reaching 15 inches (381 mm). These heavy rains elevate the risk of flash flooding, especially in low-lying areas and along rivers.

After landfall, Milton is expected to track across the Florida Peninsula and emerge into the Atlantic, where it will briefly remain a hurricane before transitioning into a post-tropical storm. However, the impacts to Florida and surrounding areas will be significant long before the storm weakens.

GOOGLE AD (NOT ENDORSED BY INSTANT WEATHER)

Peak Storm Surge Forecast in FLorida for Hurricane Milton, Courtesy of The National Hurricane Center.

Milton’s rapid intensification has been fuelled by its movement through an area of deep, warm waters, with sea surface temperatures exceeding 28°C, providing ample energy for the storm. Additionally, low wind shear in the region has allowed the hurricane to strengthen unhindered. However, as Milton moves further north, it is expected to encounter stronger wind shear, which should start to weaken the storm after about 24 hours as a Category 5 hurricane. Though this shear may reduce Milton’s intensity, it could also cause the storm to expand, spreading its damaging winds and heavy rains over a much larger area. The current NHC forecast suggests that Milton could make landfall as a Category 3 hurricane, with maximum sustained winds of 125 mph (201 km/h).

GOOGLE AD (NOT ENDORSED BY INSTANT WEATHER)

States of Emergency remain in place for much of Florida, with the exception of the Panhandle. Residents in the projected path are being urged to finalize their preparations while there is still time. Tropical storm-force winds are expected to arrive as early as overnight Tuesday and Wednesday morning, with landfall projected for Wednesday evening. While uncertainty remains regarding Milton’s exact landfall location and strength, the potential for widespread heavy rainfall, destructive winds, and life-threatening storm surges is significant.

If you or your loved ones are in the storm’s potential path, it’s crucial to stay informed, heed evacuation orders if they are issued, and follow any directives from local emergency personnel. We will continue to provide updates as more information becomes available, so stay tuned. Your safety is the priority as Hurricane Milton approaches.

Forecast Track and Intensity of Hurricane Milton with Sea Surface Temperatures, courtesy of Tomer Burg.

Florida Braces for Second Major Hurricane Hit in Less Than Two Weeks With Milton; Tampa Area Could See Life-Threatening Storm Surge

/

Forecast Track for Hurricane Milton, Courtesy of The National Hurricane Center.

After monitoring a disturbance in the Western Caribbean and Gulf of Mexico for over a week, the National Hurricane Center (NHC) confirmed the formation of Tropical Depression 14 in the Western Gulf, which quickly strengthened into Tropical Storm Milton by yesterday afternoon. Since then, Milton has continued to strengthen, with both satellite and aircraft reconnaissance data indicating a sharp increase in intensity. As of the latest update, Milton has been upgraded to a Category 1 hurricane, with maximum sustained winds of 80 mph (129 km/h).

What makes this storm particularly concerning is its projected path, which takes it directly toward the Tampa Bay area. If this forecast holds, Milton will be the first hurricane to make landfall in Tampa since 1996. However, what’s raising even more alarm is the potential for a greater storm surge in the Tampa area than what was seen with Hurricane Helene less than two weeks ago. Milton’s angle of approach is expected to produce a more severe storm surge in the region, which could compound the impact.

While the formation of hurricanes in the Western Gulf of Mexico isn’t particularly common, it’s certainly not unprecedented, especially given the exceptionally warm water temperatures the basin is currently experiencing. These conditions are ripe for storms like Milton to intensify quickly.

GOOGLE AD (NOT ENDORSED BY INSTANT WEATHER)

As of now, Hurricane Milton is forecasted to track almost due east today and tomorrow before turning northeast late on Monday. It will remain offshore of the Yucatan Peninsula, but close enough to prompt Tropical Storm Watches and Warnings in the region. The storm is expected to pick up speed on Tuesday and Wednesday, continuing along its northeastward track, as it heads toward Florida, with landfall anticipated late Wednesday morning or early afternoon.

There’s still significant uncertainty about the storm’s exact path, especially where it will ultimately make landfall in Florida. Current model forecasts, along with the official NHC projection, suggest that Milton will make landfall north of Tampa, near the Crystal River area. If this track holds, it may spare Tampa from the worst of Milton’s winds, but the region will still face heavy rainfall and significant storm surge. Early estimates suggest up to 6 inches (152 mm) of rain and a storm surge that could reach as high as 10 feet in Tampa Bay.

It’s important to note that track forecasts this far out still have a margin of error of around 100 miles, so these projections could change over the coming days. As more data comes in, the forecast will likely be refined.

Following making landfall, Milton is expect to cross the Florida Peninsula and into the Atlantic Ocean, where it will continue briefly as a hurricane before transitioning into a post-tropical storm.

Model Forecast Tracks for hurricane Milton, Courtesy of Tomer Burg.

Milton is currently moving through an area of warm, deep waters, with sea surface temperatures above 28°C, which are providing ample fuel for the storm’s rapid intensification. Additionally, there is very little wind shear in the area, allowing Milton to strengthen even faster. Meteorologists are drawing comparisons to the rapid intensification recently seen with Hurricane Helene.

By late Monday, Hurricane Milton is expected to become a Major Hurricane, reaching at least Category 3 status. There’s still some disagreement among weather models about how strong Milton will ultimately become. Regional hurricane models are predicting a more intense storm than global models, with some even forecasting Milton to briefly reach Category 5 strength. However, these models also show that the storm may weaken slightly before making landfall, thanks to increasing shear near the Florida coastline. This shear, while helping to weaken Milton, could also cause the storm to grow in size, spreading its impacts over a much larger area.

The current NHC forecast estimates Milton will make landfall as a Category 3 hurricane, with maximum sustained winds in excess of 111 mph (178 km/h). However, the NHC has acknowledged that their forecast may be conservative, given the model predictions.

GOOGLE AD (NOT ENDORSED BY INSTANT WEATHER)

In anticipation of Milton’s arrival, States of Emergency have already been declared across most of Florida, with the exception of the Panhandle. Residents in the projected path are being urged to begin making preparations, as storm surge and hurricane watches are expected to be issued later today and overnight. Emergency officials are warning that this could be Florida’s largest evacuation effort since 2017, with millions potentially in the storm’s path.

Hurricane Milton’s landfall is still a few days away, providing enough time for residents in the affected areas to make necessary preparations. While Milton’s exact track and strength at landfall remain uncertain, the threat of heavy rainfall, damaging winds, and life-threatening storm surges is significant.

If you or your loved ones are in the storm’s potential path, it’s crucial to stay informed, heed evacuation orders if they are issued, and follow any directives from local emergency personnel. We will continue to provide updates as more information becomes available, so stay tuned. Your safety is the priority as Hurricane Milton approaches.

Forecast Intensity from different models for hurricane Milton, courtesy of Tomer Burg.

Ontario’s Potential Last Severe Thunderstorm Risk of the Year on Sunday to Usher In a Chilly Start This Week

/

NOTE: YOU CAN CLICK ON THE MAP TO OPEN A ZOOMABLE IMAGE

Get ready, Ontario! While we've been enjoying a relatively mild start to fall, aside from a few exceptions, a significant change is on the horizon. As we head into the first weekend of October, it looks like Mother Nature is gearing up to bring in more seasonally appropriate weather. But, true to Ontario's reputation, it won’t happen quietly.

The weekend so far has seen relatively calm weather across Southern Ontario, with many areas enjoying pleasant temperatures in the mid to upper teens. This marks a shift from the consistent 20°C-plus days we experienced through much of September. While it's been nice, things are about to take a turn. We’re expecting a sudden surge of warmer air on Sunday, and that warm-up could set the stage for some potentially severe weather as we move into the morning and afternoon hours.

GOOGLE AD (NOT ENDORSED BY INSTANT WEATHER)

This brief October "heatwave" could push temperatures close to 20-25°C in Deep Southwestern Ontario and across the Golden Horseshoe. For those of you in Central and Eastern Ontario, however, don’t expect to feel much of this warmth. A stubborn pocket of cooler air is going to dig in, holding temperatures in the mid-teens across that region, keeping it much cooler than the rest of the province.

Unfortunately, this warm-up isn’t all sunshine. It will come hand-in-hand with some unsettled weather. A potentially strong line of thunderstorms is expected to cut across Southern Ontario on Sunday morning and afternoon. The latest data suggests that this line of storms could develop over Lake Huron by late morning and track eastward, making its way onshore just east of Lake Huron and Georgian Bay.

SIMULATED RADAR @ 12 PM ON SUNDAY - MAP FROM WEATHERBELL

There is still some uncertainty regarding the intensity of these storms. The early timing and limited warm air this far north may impact how severe the storms get. However, the atmosphere seems primed to support at least a marginal severe threat. We could see strong wind gusts, potentially reaching 90 km/h, and even hail up to quarter-size. There’s also a possibility that the risk level could be upgraded to slight by morning if conditions appear more favourable.

There is a low tornado risk—while it can’t be completely ruled out, the messy, linear storm structure might limit the chances of an isolated tornado forming. Still, it’s always better to stay cautious when severe weather is in the forecast.

GOOGLE AD (NOT ENDORSED BY INSTANT WEATHER)

This line of storms will continue pushing eastward through the Golden Horseshoe and areas east of Lake Simcoe by early to mid-afternoon. There’s potential for some intensification as the day progresses, or we could even see additional storms developing in the wake of the initial line. The zone between Bancroft, Peterborough, and Durham Region, and possibly stretching into Niagara, seems to have the highest risk for severe weather, should the conditions align more favourably.

By the late afternoon, the bulk of the storm activity will shift into the United States, where further severe weather could develop over Upstate New York and Pennsylvania. As a result, the storm threat across Southern Ontario should rapidly diminish by early evening. Given the time of year and the fact that cooler weather is set to follow, it’s quite possible that this could be our last widespread severe weather event of the season.

GOOGLE AD (NOT ENDORSED BY INSTANT WEATHER)

ESTIMATED TEMPERATURE @ 7 AM ON TUESDAY - MAP FROM WEATHERBELL

Speaking of cooler weather, expect a noticeable drop in temperatures as we start the new week. By Monday and Tuesday, much of Southern Ontario will feel the chill, with daytime highs struggling to climb into the mid-teens.

Central and Eastern Ontario could be even cooler, with some areas potentially stuck in single-digit highs. The nights will be even colder. On both Tuesday and Wednesday mornings, some regions in Central and Eastern Ontario could dip below 0°C, bringing a risk of frost for a large portion of Southern Ontario.

At this point, we’re not expecting s-word to enter the forecast this week at least in Southern Ontario, but the cold snap will certainly make it feel like fall has truly arrived. So, if you’ve been holding off on packing away your summer wardrobe, it might be time to start thinking about those cozy sweaters and heavier jackets.

GOOGLE AD (NOT ENDORSED BY INSTANT WEATHER)

LONG RANGE TEMPERATURE FORECAST FOR THANKSGIVING SUNDAY - NOTE: THIS WILL LIKELY CHANGE! (MAP FROM WEATHERBELL)

However, there might be some good news as we look ahead to the Thanksgiving long weekend. Early indications suggest a potential return of warmer air by next weekend, bringing with it another temperature boost. Some models hint at temperatures pushing 20°C once again in parts of Southern Ontario, which would be quite a surprise for Thanksgiving, given that we’ve seen flurries on the holiday in previous years!

It’s still too early to say for sure, though, as the forecast could change over the coming days. But for now, we’ll remain optimistic about the possibility of a pleasant, mild Thanksgiving weekend. As always, we’ll be monitoring the situation closely and will provide a more detailed Thanksgiving preview later this week.

Early October Windstorm Will Blow Across the Prairies This Weekend

/

NOTE: YOU CAN CLICK ON THE MAP TO OPEN A ZOOMABLE IMAGE

The first weekend of October is shaping up to feel like true fall across the Prairies, with a strong low-pressure system bringing powerful wind gusts of 70-100 km/h. These winds are set to begin later this afternoon and continue throughout the day on Saturday. The prolonged high winds will likely strip many trees of their remaining leaves and could pose a serious hazard to traffic, especially for transport trucks and trailers

GOOGLE AD (NOT ENDORSED BY INSTANT WEATHER)

The windstorm will kick off in the Alberta Foothills this afternoon, quickly spreading across Southern Alberta as the evening progresses. Expect pockets of gusts exceeding 90 km/h along the QE2 corridor south of Calgary and near the American border. These intense gusts won’t last long in Alberta, though, as the winds are expected to ease overnight.

The storm will move eastward into Saskatchewan through the evening and overnight hours. By morning, the low-pressure centre will stall and the winds will intensify, leading to widespread gusts approaching, and in some areas surpassing, 100 km/h across much of Southern Saskatchewan. These fierce winds will persist into the late afternoon and early evening.

The system will push into Manitoba by late Saturday morning, with strong winds continuing throughout the day before gradually subsiding. The strongest gusts, reaching over 90 km/h, are expected in the southwest corner of the province, but many parts of Southern Manitoba will still experience significant gusts.

Temperatures will cool down a bit following this windstorm, serving as just a taste of the fall storms we can expect as the season progresses.

Fall Colours Reach Peak in Parts of Southern Ontario Heading Into First Weekend of October

/

NOTE: YOU CAN CLICK ON THE MAP TO OPEN A ZOOMABLE IMAGE

Fall colours have been slow to arrive in parts of Southern Ontario due to a relatively mild September, but as we move into the first weekend of October, the transformation is starting to take hold. Several parks are now within their 'peak' fall colours range, providing excellent viewing opportunities.

The best spots to see the vibrant colours this weekend will be in Central and Eastern Ontario, as well as Bruce County along the Lake Huron shoreline. Many parks in these areas are showing between 40-50% colour change, with some even nearing full transformation!

GOOGLE AD (NOT ENDORSED BY INSTANT WEATHER)

Note: The above map is extrapolated using data from OntarioParks.ca, but some parks may not have updated their latest report yet. As such, the actual colour change in your area may be further along than currently reported.

All provincial parks in Southern Ontario are reporting at least 10% colour change, indicating that the seasonal shift is well underway. However, it could take another week or two for many areas to reach their 'peak.'

With Thanksgiving just around the corner, it’s likely that much of Southern Ontario will be hitting its peak fall colours, making it the perfect time to enjoy the beauty of the season during the long weekend.

For those wondering, 'peak' fall colours occur when at least 60% of the leaves have changed. Based on this, Algonquin and Mikisew Parks are officially in their peak, though this won’t last long. Mikisew is already reporting 70% of its leaves have fallen, so Algonquin might be a better option for now, with only 20% leaf fall reported.

GOOGLE AD (NOT ENDORSED BY INSTANT WEATHER)

Several provincial parks are currently showing between 40-50% colour change, mostly in Central and Eastern Ontario:

  • Arrowhead (50%)

  • Charleston Lake (50%)

  • Frontenac (50%)

  • MacGregor Point (50%)

  • Sturgeon Bay (40%)

  • Darlington (40%)

  • Turkey Point (40%)

  • Murphys Point (40%)

  • Bon Echo (40%)

  • Silent Lake (40%)

  • Driftwood (40%)

These parks are offering good chances to catch the fall display, and since the data can be a few days old, they may already be approaching peak colours by the weekend.

GOOGLE AD (NOT ENDORSED BY INSTANT WEATHER)

The remaining parks in Southern Ontario are reporting 20-30% colour change, especially around Lake Ontario and Southwestern Ontario near Lake Huron.

Parks like Pinery, Awenda, Presqu’ile, Forks of the Credit, and Port Burwell are still at about 10%, but with cooler fall weather settling in, this will likely change quickly in the coming days. The peak for these parks is expected to arrive in 10-15 days, just in time for Thanksgiving weekend or shortly after.

Stay tuned for more updates as we continue to track the progress of fall colours across Southern Ontario!

‘Strong’ Geomagnetic Storm Takes Aim at Earth; Northern Lights May Dazzle the Skies Across Canada on Thursday & Friday

/

NOTE: YOU CAN CLICK ON THE MAP TO OPEN A ZOOMABLE IMAGE

One of the most powerful solar flares in recent years erupted from the sun on Tuesday evening, classified as an X7.1 flare. Initially, it was unclear whether this flare had produced a coronal mass ejection (CME), which is a large expulsion of plasma and magnetic field from the sun’s corona.

GOOGLE AD (NOT ENDORSED BY INSTANT WEATHER)

However, data that came in later confirmed that a CME was indeed produced and, more importantly, appears to be Earth-directed. This means that the CME is expected to impact our planet, setting off the possibility of a ‘strong’ geomagnetic storm and potentially bringing the northern lights much farther south than usual across Canada to close out the week.

The exact timing of the CME's arrival, however, remains somewhat uncertain. Forecast models suggest it could arrive anywhere between late Thursday and early Saturday. The CME might even come in multiple waves, according to the latest data.

If this happens, we could be in for two consecutive nights of auroras lighting up the skies—if the conditions align perfectly! While the Northern Lights are never guaranteed, the next couple of nights offer a decent chance to catch a breathtaking display, depending on where you are located.

GOOGLE AD (NOT ENDORSED BY INSTANT WEATHER)

The Space Weather Prediction Center (SWPC) has issued a Geomagnetic Storm Watch, with the CME expected to reach Earth between Thursday and Saturday. Based on the latest observations, this CME could trigger G1 (minor) to G3 (strong) geomagnetic storm conditions.

The SWPC’s latest forecast predicts that a 'strong' (G3) geomagnetic storm may unfold late Thursday evening into the early overnight hours, followed by a potentially more prolonged geomagnetic storm ranging from ‘moderate’ (G2) to ‘strong’ (G3) on Friday night into Saturday morning.

GOOGLE AD (NOT ENDORSED BY INSTANT WEATHER)

A G2 to G3 storm is strong enough to make the northern lights visible across much of Canada, especially if conditions are just right. In the past, storms of this magnitude have allowed the auroras to be seen as far south as Southern Ontario, and in some cases, even into the northern United States. In fact, the SWPC notes the possibility of the auroras being visible as far south as parts of the lower Midwest and Oregon in the U.S.

That said, space weather forecasting comes with some inherent uncertainty. The exact timing of a CME’s arrival can vary, and its intensity is often unknown until a few hours before it strikes Earth. There is usually a 12- to 24-hour window for the CME’s arrival, which means that although the current forecast favours North American viewing on Thursday and Friday nights, the event could just as easily occur during daylight hours, rendering it invisible to viewers in North America and giving those in Europe a better chance at catching the show instead.

GOOGLE AD (NOT ENDORSED BY INSTANT WEATHER)

NOTE: YOU CAN CLICK ON THE MAP TO OPEN A ZOOMABLE IMAGE

Aside from timing, cloud cover will also be a crucial factor in determining whether you'll have a good view of the northern lights. As of now, fairly clear skies are expected across much of southern Canada on Thursday night. Specifically, areas of Atlantic Canada, Southern Quebec, and Southern Ontario are forecasted to have little to no cloud cover during the overnight hours, which is ideal for aurora viewing.

NOTE: YOU CAN CLICK ON THE MAP TO OPEN A ZOOMABLE IMAGE

Further north, however, there could be widespread cloud cover that might obstruct the view around James Bay in Northern Ontario and Quebec. Similarly, Northwestern Ontario could see some cloudiness, with the exception of a pocket near the International border around Thunder Bay.

In Southern Manitoba, skies look clear south of the Interlake region, though clouds will likely impact Northern Manitoba and Saskatchewan.

GOOGLE AD (NOT ENDORSED BY INSTANT WEATHER)

NOTE: YOU CAN CLICK ON THE MAP TO OPEN A ZOOMABLE IMAGE

For Western Canada, Southern Saskatchewan and Southeastern Alberta are expected to have the clearest conditions. Meanwhile, much of British Columbia, along with central and northern Alberta, could see cloud cover that may limit visibility.

Check out our free app, Instant Weather for a more in-depth cloud coverage forecast specific to your exact location.

If you’re planning to watch for the auroras, another factor working in your favour this time around is the moon phase. Unlike last month’s aurora event, the moon is currently near 0% full, as we’ve just had a new moon on Tuesday night. This means that there won’t be any moonlight competing with the northern lights, making it easier to spot even faint auroras.

GOOGLE AD (NOT ENDORSED BY INSTANT WEATHER)

NOTE: YOU CAN CLICK ON THE MAP TO OPEN A ZOOMABLE IMAGE

When it comes to where the northern lights might be visible, it all depends on the strength of the geomagnetic storm and how it interacts with Earth’s magnetic field. Historically, during a 'strong' (G3) storm, auroras are most visible across northern Canada, including Northern Quebec, Far Northern Ontario, the Prairies, and parts of British Columbia. In these regions, the northern lights could be visible overhead and bright enough to see with the naked eye.

In southern regions, including Northeastern Ontario (Sault Ste. Marie, Sudbury, and North Bay), as well as parts of Quebec, there’s a chance of seeing the auroras overhead or just above the horizon.

This could extend into northern parts of Southern Ontario, including Muskoka, Algonquin Park, and the Ottawa Valley. However, depending on the storm's strength, auroras may only be visible along the northern horizon, and you might need a camera to capture them, as they may not be strong enough for the naked eye.

GOOGLE AD (NOT ENDORSED BY INSTANT WEATHER)

For the rest of Southern Ontario and into Atlantic Canada, if the auroras appear, they will likely be on the northern horizon. Here, too, you may need a camera or smartphone to capture the lights, as they may be too faint to see without assistance.

Remember, light pollution can greatly impact your ability to see the northern lights, especially in urban areas. For the best viewing experience, it’s essential to get away from city lights. A resource like DarkSiteFinder can help you locate areas with low light pollution for optimal aurora viewing.

Northern Lights Timing

Many are accustomed to the precise scheduling of weather events, from thunderstorms and winter weather to solar eclipses, where timing is crucial. It’s understandable, then, that there’s a desire for a similar pinpoint timing for the best viewing of the aurora. However, the reality of predicting the best time to view the northern lights is not so straightforward.

Here’s the deal: Unlike weather events driven by terrestrial conditions, the aurora is influenced by solar activity, which is far less predictable. We can estimate that the northern lights are best viewed from just after sunset to just before sunrise, provided the skies are dark and clear. Beyond that, precise timing for peak aurora activity is challenging to forecast with current technology.

GOOGLE AD (NOT ENDORSED BY INSTANT WEATHER)

Space weather forecasting doesn't yet allow us to predict exactly when solar energy will impact Earth. We know it's coming, but how and when it interacts with our planet's magnetic field can vary. Often, we only have a few hours' notice before the solar energy is detected by satellites.

Furthermore, the intensity of the northern lights can fluctuate significantly over short periods. You might have noticed this variance if you've observed the lights before—periods of dim activity suddenly bursting into vibrant colors. This is due to the variable concentration of solar particles interacting with our atmosphere.

While we can inform you a few hours ahead when conditions are likely to be good, predicting the exact peak of aurora activity is akin to forecasting the peak of a meteor shower; we know the best night but not the best hour.

GOOGLE AD (NOT ENDORSED BY INSTANT WEATHER)

After Devastating the Southeastern United States, Is Helene Coming to Canada?

/

Satellite Image of tropical storm Helene from September 27th at 10:21am EDT, Courtesy of Colorado state university.

After making landfall as a major Category 4 Hurricane late last night and its subsequent path of destruction across Florida, Georgia, and the Carolinas, many in Ontario are wondering if we will feel the impacts of Helene closer to home over the weekend. Helene has since weakened to a tropical storm, but it remains a massive storm with far reaching impacts.

GOOGLE AD (NOT ENDORSED BY INSTANT WEATHER)

Helene has made its way well inland over the past 12 hours, with its low pressure centre currently situated over the Southern Appalachians. Despite still being located so far south, light cloud cover from the storm has made its way into Southwestern Ontario and the Niagara Region. This cloud cover has been responsible for a fabulous display of sun halos across the region this morning!

The storm will continue to gradually track to the northwest this afternoon before stalling out over the Tennessee Valley overnight, where it will encounter and merge with another low. The lack of motion in the storm will unfortunately bring even more rainfall and further exacerbate the extreme flooding and landslide situation already being seen throughout the Southern Appalachians and bring that into the Ohio and Tennessee Valleys.

In Ontario, the cloud cover from Helene will push deeper into the province this afternoon and light rain can be expected in Southwestern Ontario, from Windsor through London and into Niagara, beginning overnight tonight and continuing through the weekend. Much of the rest of Southern Ontario can expect a dreary weekend as the cloud cover settles in.

The storm will actually travel in a loop, known as the Fujiwhara Effect, while it merges with the second low and by Sunday, it is expected to finally start moving eastward towards the Atlantic and then northeastward along the Eastern Seaboard, where it expected to begin to dissipate.

Forecast Tracks from different models for Helene, Courtesy of Tomer Burg.

"Catastrophic and Potentially Unsurvivable" Major Hurricane Helene Set to Make Landfall in Florida Late Thursday

/

Satellite Image of Hurricane Helene from September 26th at 2:02Pm EDT, Courtesy of Tropical Tidbits.

Hurricane Helene continued its intensification overnight, strengthening to a Category 2 Hurricane this morning and then to a Category 3 Hurricane this afternoon, with a clearly formed eye and estimated sustained wind speeds of 120mph (195km/h). Tropical storm-force winds are already being felt across Southwest Florida along with storm surge causing inland flooding in coastal communities. The storm will continue to strengthen throughout the day and pick up speed as it makes its final approach for landfall along the Big Bend Coast as a Major Hurricane.

GOOGLE AD (NOT ENDORSED BY INSTANT WEATHER)

There has been little change to the forecast track from the National Hurricane Center (NHC) over the last 24 hours. Hurricane Helene made its projected north-northeastward turn and it will continue along that track before making a final turn northward this afternoon before landfall later this evening.

While the exact location of landfall remains unclear, it appears that will occur in Apalachee Bay. The NHC has stated that in comparison to previous hurricanes in the Gulf of Mexico in the past decades, Helene is on the larger size and as such, its impacts will be very widespread, especially on the east side of the eye. While the massive wind field will bring tropical storm-force winds across the entire state of Florida, hurricane-force winds will be within the eyewall, along the Big Bend Coast, arriving slightly ahead of landfall this evening. These devastating hurricane-force winds are expected to be at least 120mph (195km/h) sustained with even stronger gusts expected.

Inundating rainfall causing widespread flooding is also a major concern with Hurricane Helene across Florida with over 5 inches (127mm) of rain expected along the Big Bend Coast and 2 inches (51mm) along the rest of the Gulf Coast of Florida, with lesser amounts further inland. Rainfall totals in the Apalachicola region could easily exceed 8 inches (203mm).

Along with intense winds and flooding rainfall, the biggest threat will be, to quote the NHC “catastophic and potentially unsurvivable storm surge”, particularly for the Apalachee Bay. The storm surge has already started to appear throughout the entire Florida Gulf Coast and the water levels will continue to increase as Hurricane Helene makes its final approach. Peak storm surge levels exceeding 10ft are expected from Apalachicola to Chassahowitzka and up to 20ft is possible from Carrabelle to Suwannee River.

These factors all combined have prompted widespread Hurricane and Tropical Storm Warnings, evacuations, and States of Emergencies throughout the entire state of Florida and beyond.

Forecast Track for Hurricane Helene, Courtesy of The National Hurricane Center.

With the speed and strength that Hurricane Helene will continue to gain, its impacts will be felt deep inland into the Southern Appalachians with damaging winds and intense rainfall.

Tropical storm-force winds are expected throughout Georgia and into the higher terrains of the mountains which will easily bring down trees and power lines, resulting in widespread power outages, as well as damage to property.

The Blue Ridge Mountains and Piedmont Region of Northern Georgia, Eastern Tennessee, and the Western Carolinas are also possibly looking at receiving up to 15 inches (381mm) of rain by the end of the weekend as the storm is expected to stall beginning late Friday over the Tennessee Valley. This much rain will bring a high risk of urban and flash flooding and landslides across the region. Meteorologists have already started to compare this to the 1916 flooding event in the Asheville, South Carolina area and impacts are expected to be greater than those from Tropical Storm Fred in 2021 and Hurricanes Frances and Ivan in 2004.

GOOGLE AD (NOT ENDORSED BY INSTANT WEATHER)

Helene will remain in an ideal environment for continued strengthening as it makes its final approach before landfall. It’s still located in an area with relatively low shear, strong upper-level divergence, as well as 30°C sea surface temperatures and warmth that extends deep below the surface. These conditions will allow the storm to further intensify from its current strength to a like high-end Category 3 Hurricane with isolated Category 4 level wind gusts.

There is still a bit of time before the storm hits to take necessary precautions to protect life and property. If you or your loved ones are in the path of the storm, please heed all directives from emergency personnel and stay safe!

Forecast Track and Intensity of Hurricane helene with Sea Surface Temperatures, courtesy of Tomer Burg.

Rapid Intensification of Helene to a Major Hurricane Expected in the Gulf as it Approaches Florida

/

Satellite Image of Hurricane Helene from September 25th at 11:26Am EDT, Courtesy of Colorado State University.

Tropical Storm Helene became a Category 1 Hurricane this morning as it continues to track offshore of the Yucatan Peninsula with maximum flight-level wind gusts measured at 81 knots (93mph or 150km/h) by recon flights. Based on this data, it is estimated that the maximum surface winds are 70 knots (81mph or 130 km/h). This is only the beginning of the strengthening of this storm as it is expected to rapidly intensify over the next 24 hours into a major Category 3 Hurricane as it bears down on the Florida Panhandle and Big Bend Coast.

GOOGLE AD (NOT ENDORSED BY INSTANT WEATHER)

The latest forecast track from the National Hurricane Center (NHC) shows that Helene is expected to turn northward and then north-northeastward later today and it will maintain that track as it makes landfall in Florida as a Major Hurricane.

At this point, it is still a bit too early to predict the exact location that Helene will make landfall along the Florida coast, but given the sheer size of the storm, the impacts will be widespread across the state. The storm has a massive wind field and tropical storm-force winds are already pushing their way into the Keys. These strong winds will gradually make their presence known further northward throughout the evening and overnight tonight, reaching the Panhandle tomorrow morning. Winds will increase in strength as the storm makes its final approach, with devastating hurricane-force wind gusts up to 125mph (200 km/h) projected for areas closest to where the storm will make landfall.

Inundating rainfall causing widespread flooding is also a major concern with Hurricane Helene across Florida with over 5 inches (127mm) of rain expected along the coast and lesser amounts of under 2 inches (51mm) further inland. Rainfall totals could easily exceed 10 inches (254mm) throughout the Panhandle.

Along with intense winds and flooding rainfall, life-threatening storm surge is expected along the entire Gulf Coast of Florida and the Big Bend Coast could see water levels exceeding 10ft. These factors all combined have prompted widespread Hurricane and Tropical Storm Warnings, evacuations, and States of Emergencies in almost every county in the state.

Forecast Track for Hurricane Helene, Courtesy of The National Hurricane Center.

Beyond landfall, the storm is expected to pack quite a punch through the rest of the Southeast and into the Ohio Valley with intense winds and heavy rainfall.

The destructive wind gusts will push their way well inland into Southern Georgia and even as far north as the Southern Appalachians. These strong winds will easily bring down trees and power lines, resulting in widespread power outages, as well as damage to property.

The Blue Ridge Mountain and Piedmont Regions of Northern Georgia and the Western Carolinas are also possibly looking at receiving up 12 inches (305mm) of rain by the end of the weekend as the storm is expected to stall beginning late Friday. This much rain will bring the risk of flooding and landslides across the region.

GOOGLE AD (NOT ENDORSED BY INSTANT WEATHER)

Helene will remain in an ideal environment over the next 24 hours with sea surface temperatures above 30°C, relatively low shear, and strong upper-level divergence, all key for rapid intensification of a tropical storm/hurricane. There is a bit of uncertainty of exactly how strong Hurricane Helene will become, with some weather models suggesting it could reach Category 4 strength, however, it is increasingly likely that it will make landfall as a Category 3 Hurricane.

It is not too late to take necessary precautions to protect life and property ahead of this storm. If you or your loved ones are in the path of the storm, please heed all directives from emergency personnel and stay safe!

Forecast Track and Intensity of Hurricane helene with Sea Surface Temperatures, courtesy of Tomer Burg.

Isolated Storms Could Bring Tornado Risk to Central Ontario and GTA on Wednesday

/

NOTE: YOU CAN CLICK ON THE MAP TO OPEN A ZOOMABLE IMAGE

As we near the end of what has been a relatively quiet month for weather across Southern Ontario, we’ve been locked in a pattern of calm conditions and unseasonably warm temperatures. But now, as we enter the first week of autumn, a shift is on the horizon!

Rainy weather has returned across much of Southern Ontario over the past few days, and unsettled conditions are expected to continue into Wednesday. There’s also potential for severe weather during the late morning, extending into the afternoon.

GOOGLE AD (NOT ENDORSED BY INSTANT WEATHER)

RAINFALL WARNING (IN GREEN) ISSUED BY ENVIRONMENT cANADA

We’re already seeing pockets of heavy rain and thunderstorms overnight, which are expected to persist until sunrise. Environment Canada has issued rainfall warnings for some areas, where localized amounts of up to 50 mm are possible.

While it's uncertain, some models indicate a slight tornado risk in the morning, particularly around the Golden Horseshoe and Niagara Region. Though this is unlikely, it’s still worth noting.

The timing of when these overnight storms clear out will be key in determining the risk for later in the morning and afternoon. According to the latest models, most storms should dissipate by sunrise, allowing the atmosphere to become more unstable heading into the late morning.

GOOGLE AD (NOT ENDORSED BY INSTANT WEATHER)

From around 11 AM through early afternoon, conditions could become favorable for isolated thunderstorms. The strongest setup is expected around Lake Simcoe, extending into the Muskoka and Haliburton regions.

While most storms are expected to remain non-severe, there is a chance of isolated tornadoes, along with marginally severe wind gusts and hail up to the size of quarters.

GOOGLE AD (NOT ENDORSED BY INSTANT WEATHER)

The Greater Toronto Area and Niagara Region are under a marginal risk for severe weather, primarily due to the potential for an isolated tornado during the afternoon and early evening. This marginal tornado risk also extends into Algonquin Park and parts of southwestern Quebec.

It’s important to keep in mind that this forecast has a high bust potential—some models show little storm development during peak hours of instability. This forecast assumes storms will develop during the afternoon, but we may need to update and downgrade the risk in the morning if it looks less likely that storms will form.

First Day of Autumn Arrives as Central and Eastern Ontario Approaches Peak Fall Colours

/

NOTE: YOU CAN CLICK ON THE MAP TO OPEN A ZOOMABLE IMAGE

As we entered September, it seemed like Mother Nature was eager to shift from summer to fall, with temperatures dropping to near freezing and even some northern areas witnessing the first snowflakes of the season.

But since then, the weather has taken a complete 180. Over the past few weeks, Southern Ontario has experienced a consistent pattern of above-seasonal temperatures and minimal precipitation. This unusual warmth for this time of year has slowed down the transition to fall colours across the region.

With the Autumn Equinox taking place early Sunday morning, we are officially in autumn, both meteorologically and astronomically. As we move deeper into the season, we’re starting to see some notable shifts in fall foliage, especially in Central and Eastern Ontario, according to the latest data.

GOOGLE AD (NOT ENDORSED BY INSTANT WEATHER)

If you're looking to catch the fall colours this week, your best bet is to head to higher elevations in Central and Eastern Ontario. Provincial parks such as Mikisew, Algonquin, and Bon Echo are reporting that around 40% of the leaves have started their transformation. The higher elevations experience slightly cooler overnight temperatures, which accelerates the colour change compared to other areas.

Note: The above map is extrapolated using data from OntarioParks.ca, but some parks may not have updated their latest report yet. As such, the actual colour change in your area may be further along than currently reported.

The ‘peak’ fall colours occur when at least 60% of the leaves have changed. With these parks now at 40%, we’re likely just a week or two away from peak viewing, perhaps as early as next weekend.

We’re also seeing some colour change along the Bruce Peninsula and throughout many parks in Central and Eastern Ontario, where about 30% of leaves have started changing. This includes parks like Sauble Falls, Arrowhead, Sturgeon Bay, Silent Lake, Frontenac, and Murphys Point.

GOOGLE AD (NOT ENDORSED BY INSTANT WEATHER)

For the rest of Southern Ontario, there is some minor colour change being reported, with 10-20% of leaves beginning to turn. However, peak colours are still several weeks away in these areas.

An important note: The calm weather over the past few weeks has allowed trees to hold onto most of their leaves. Without any significant wind events, the leaf fall percentage is averaging around 10-20%. If these calm conditions continue, we should see a vibrant display of colours in the weeks ahead.

Looking at the medium to long range forecast, we’re expecting slightly above-seasonal temperatures to continue through the rest of September. This could mean peak fall colours might arrive later than usual this year, although it’s hard to say for certain. We do anticipate more active weather this week, with several rounds of heavy rain possible, which could potentially knock some leaves off the trees.