NORTHERN ONTARIO: Thunderstorm Forecast for Friday, September 1, 2023

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Thunderstorms are currently not expected across Northern Ontario on Friday.

NORTHERN ONTARIO: Thunderstorm Forecast for Wednesday, August 30, 2023

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Thunderstorms are currently not expected across Northern Ontario on Wednesday.

NORTHERN ONTARIO: Thunderstorm Forecast for Tuesday, August 29, 2023

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Thunderstorms are currently not expected across Northern Ontario on Tuesday.

NORTHERN ONTARIO: Thunderstorm Forecast for Monday, August 28, 2023

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Thunderstorms are currently not expected across Northern Ontario on Monday.

NORTHERN ONTARIO: Thunderstorm Forecast for Sunday, August 27, 2023

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Thunderstorms are currently not expected across Northern Ontario on Sunday.

NORTHERN ONTARIO: Thunderstorm Forecast for Friday, August 25, 2023

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Thunderstorms are currently not expected across Northern Ontario on Friday.

NORTHERN ONTARIO: Thunderstorm Forecast for Thursday, August 24, 2023

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Thunderstorms are currently not expected across Northern Ontario on Thursday.

NORTHERN ONTARIO: Thunderstorm Forecast for Wednesday, August 23, 2023

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Thunderstorms are currently not expected across Northern Ontario on Wednesday.

NORTHERN ONTARIO: Thunderstorm Forecast for Tuesday, August 22, 2023

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Thunderstorms are currently not expected across Northern Ontario on Tuesday.

NORTHERN ONTARIO: Thunderstorm Forecast for Monday, August 21, 2023

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Thunderstorms are currently not expected across Northern Ontario on Monday.

NORTHERN ONTARIO: Thunderstorm Forecast for Sunday, August 20, 2023

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Thunderstorms are currently not expected across Northern Ontario on Sunday.

NORTHERN ONTARIO: Thunderstorm Forecast for Saturday, August 19, 2023

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Thunderstorms are currently not expected across Northern Ontario on Saturday.

NORTHERN ONTARIO: Thunderstorm Forecast for Friday, August 18, 2023

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Thunderstorms are currently not expected across Northern Ontario on Friday.

NORTHERN ONTARIO: Thunderstorm Forecast for Thursday, August 17, 2023

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Read more in our full forecast here.

NORTHERN ONTARIO: Thunderstorm Forecast for Wednesday, August 16, 2023

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The risk of severe weather is set to make a return to Northern Ontario on Wednesday, marked by the anticipated formation of a potent line of storms during the late afternoon. A robust environment is expected to develop ahead of the line of storms, providing substantial energy as it traverses Northwestern Ontario. This environment could lead to various severe hazards, including the likelihood of a couple of tornadoes, hail of golf ball size, and gusts of wind surpassing 110 km/h.

As of the latest data, the onset of storm initiation is projected somewhere in the region between the Manitoba border and the Dryden area. The initiation is estimated to unfold during the time frame of 2 - 5 PM. During this period, the tornado and hail risk is expected to be at its maximum. These isolated discrete cells have the potential to grow into rotating supercells, heightening the risk of tornadoes and large hail.

As the late afternoon approaches, these isolated storms are forecasted to merge together, culminating in the formation of a squall line extending from Atikokan to Armstrong. The main storm concern will shift towards widespread damaging wind gusts, surpassing speeds of 90 km/h. While the possibility of large hail and tornadoes remains, their overall likelihood is anticipated to wane as the merge occurs.

The line is anticipated to reach the Thunder Bay area by early evening. At this point, the precise severity of the storm threat becomes less certain, so we have placed them in between the slight and strong risk on our map. However, Thunder Bay is likely to see strong storms either way.

NORTHERN ONTARIO: Thunderstorm Forecast for Tuesday, August 15, 2023

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Thunderstorms are currently not expected across Northern Ontario on Tuesday.

NORTHERN ONTARIO: Thunderstorm Forecast for Monday, August 14, 2023

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Thunderstorms are currently not expected across Northern Ontario on Monday.

NORTHERN ONTARIO: Thunderstorm Forecast for Sunday, August 13, 2023

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Thunderstorms are currently not expected across Northern Ontario on Sunday.

NORTHERN ONTARIO: Thunderstorm Forecast for Saturday, August 12, 2023

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Thunderstorms are currently not expected across Northern Ontario on Saturday.

NORTHERN ONTARIO: Thunderstorm Forecast for Friday, August 11, 2023

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Thunderstorms are currently not expected across Northern Ontario on Friday.