Northern Ontario: Thunderstorm Outlook for Tuesday, August 10, 2021

Forecast Discussion

There is the potential for some quite severe storms for parts of Northwestern Ontario during the afternoon and evening on Tuesday. The main risk zone includes Atikokan to Sioux Lookout, Armstrong, Fort Hope and Lansdown House. These storms could produce damaging wind gusts up to 100km/h, large hail and heavy downpours. One or two tornadoes can’t be ruled out either with the strongest storms. Surrounding regions could see non-severe and a few isolated severe storms including Dryden and Geraldton. There is also an isolated severe risk for the North Bay region up into Temiskaming Shores. The storm risk will come to an end by midnight as the storms fizzle out.