Northern Ontario: Thunderstorm Outlook for Tuesday, June 8, 2021

Forecast Discussion

Thunderstorms related to severe weather on late Monday across Minnesota are expected to reach the international border around Fort Frances overnight and into Tuesday morning. By the time the storms reach Ontario they’ll be quite weak so severe weather is unlikely. The main risks with these storms are some strong wind gusts, heavy rainfall and lots of lightning. They will quickly die out over Lake Superior during the late morning. Another round of storms should develop later in the day through the afternoon and evening hours east of Lake Superior in southern parts of Northeastern Ontario. One or two of these storms could bring some severe weather including damaging wind gusts, sizable hail and heavy rainfall. Flash flooding will be a major concern since these storms will be moving slowly and could easily dump 50-100mm over a location within a few hours. The storm threat will come to an end after sunset.