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CTV News Winnipeg Skywatch Weather Blog - Thursday, July 2, 2020
After a brief break from the heat warnings on Canada Day, they are back in effect today for Winnipeg, southern and east-central Manitoba and northwestern Ontario.
An upper ridge has locked back on to the province with temperatures in the low 30s and dew points closing in on 20C. That's producing humidex values that feel even hottter, closer to 40. Not much relief is in sight for at least another couple of days.
Conditions are primed for convection, so it's no surprise severe thunderstorm watches have already been issued for parts of west-central and southwestern Manitoba this afternoon. Look for them to be extended further across the southwest throughout the day.
The initial area of concern is north of Dauphin and west of the north basin of Lake Winnipeg. Potentially severe thunderstorms could trigger there by mid-afternoon.
It's expected that thunderstorms could start later this afternoon in the southwest. Again, they could become severe. The main threats appear to be hail and strong winds, but significant rainfall or even a tornado are possible.
Weakening thunderstorms should move into the Red River Valley overnight ahead of another hot and humid day on Friday.