Northern Ontario: Thunderstorm Outlook for Monday, July 19, 2021

Forecast Discussion

Widespread thunderstorm activity is expected to develop across Northern Ontario during the afternoon on Monday. There is the potential for a few of these storms to become severe for locations such as Thunder Bay, Kapuskasing and Timmins. The main risks with these storms will be large hail, damaging wind gusts and flash flooding. An even stronger risk for severe storms exists through parts of Northeastern Ontario along the Quebec border including Timmins, Cochrane, Temiskaming Shores and Kapuskasing.

In this area, one or two tornadoes can’t be ruled out in addition to the damaging wind gusts and large hail. The latest models show a few isolated supercells developing near Kapuskasing during the late evening and track southeastward through the aforementioned region before crossing into Quebec. The storm threat will come to an end just after midnight.