Northern Ontario: Fall Weather Hazards Outlook for Sunday, October 10, 2021

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Forecast Discussion

Heavy rain will work its way through parts of Northwestern Ontario with the heaviest totals found along the Internation border and the northwestern Lake Superior shoreline including Thunder Bay. Rainfall totals by the end of Sunday in this area are expected to range from 25-40mm with localized pockets picking up close to 50mm.

In addition to the rain, heavy fog will yet again be an issue overnight and into Sunday morning for much of the Lake Superior shoreline. If you’re travelling out on the roads before sunrise then be sure to drive cautiously as the fog can result in near-zero visibility. The fog will come to an end by the late morning hours after sunrise.

Northern Ontario: Fall Weather Hazards Outlook for Saturday, October 9, 2021

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Forecast Discussion

Heavy fog patches are expected to develop around Lake Superior during the early morning hours on Saturday. This could result in poor driving conditions due to near-zero visibility. Be sure to drive with caution. The fog will dissipate just after sunrise.

Southern Ontario: Fall Weather Hazards Outlook for Saturday, October 9, 2021

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Forecast Discussion

Heavy fog is possible throughout parts of Southwestern Ontario including Windsor, Sarnia, London and K/W during the early morning on Saturday. This may reduce visibility on the roads to near-zero before sunrise so be sure to travel with caution. As usual, the fog will burn off quickly after sunrise. Heavy rain is also expected during the day on Saturday with the heaviest rainfall accumulation around Lake Huron and Georgian Bay. Although with the highest rainfall totals topping out at around 10-15mm, it won’t come close to the 25mm threshold to include on the outlook map.

Northern Ontario: Fall Weather Hazards Outlook for Friday, October 8, 2021

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Forecast Discussion

Heavy fog is expected to develop around Lake Superior and into parts of Northeastern Ontario during the overnight and into Friday morning. This could cause reduced visibility on the roads and make for difficult travel conditions. The fog will dissipate after sunrise.

Southern Ontario: Fall Weather Hazards Outlook for Friday, October 8, 2021

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Forecast Discussion

Heavy fog has developed around the Hamilton/Niagara region this evening and is expected to further expand to encompass parts of Southwestern Ontario overnight and into Friday morning. Fog is also possible throughout Eastern Ontario during the early morning hours on Friday. This could cause reduced visibility on the roads and make for difficult travel conditions. The fog will dissipate after sunrise.

Southern Ontario: Thunderstorm Outlook for Tuesday, September 21, 2021

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Forecast Discussion

Heavy rainfall late in the day on Tuesday will move into parts of Southern Ontario mainly along the Lake Huron and Georgian Bay shorelines. There is the potential a few embedded thunderstorms may be present within this area of rainfall, but it’s very questionable. Due to the lack of intensity and coverage, we won’t issue an outlook for this risk.

Northern Ontario: Thunderstorm Outlook for Monday, September 20, 2021

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Forecast Discussion

Heavy rainfall will continue to affect Northwestern Ontario throughout the day on Monday. This area of rainfall will also have some embedded thunderstorm activity which should mainly remain non-severe with strong wind gusts and heavy rainfall as the main threats. The thunderstorm activity will slowly track to the east during the day and could also bring some thunderstorms to parts of Northeastern Ontario overnight into Tuesday - more details on this soon.

Northern Ontario: Thunderstorm Outlook for Sunday, September 19, 2021

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Forecast Discussion

Thunderstorms are expected to develop over Minnesota and track into Northwestern Ontario late in the day on Sunday. There is some uncertainty about the timing of when these storms will reach our side of the border which will determine the exact risk they will pose to the region. If they show up earlier, the environment would be favourable for a few of these storms to bring some severe threats including strong wind gusts, large hail and heavy rainfall. The tornado risk is fairly low, but can’t be completely ruled out. Storms will continue late in the evening and overnight with the isolated severe risk still present mainly due to some flash flooding concerns. More storms are possible on Monday across Northern Ontario.