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The risk will span all three Prairie provinces on both Wednesday and Thursday, with the chance for heavy rain, strong winds, and very large hail where storms develop.
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The risk pops up as heat warnings continue to cover much of the region, as well, with Environment and Climate Change Canada advising folks to take precautions to protect themselves, their families and their neighbours.
The heat will relax somewhat and shift east late week, with a shot of much cooler weather expected for northern areas late week, and into the weekend across the south. This will be followed by more heat for next week.
Heat continues as storm threat increases for Wednesday and Thursday
Wednesday will see widespread, 30-degree daytime highs. That's after several communities broke new daytime high temperature records to start the week on Monday.
Temperatures will be 10-13°C above normal across most of the province of Alberta on Wednesday. Through the day, dew points will approach the upper teens, making the air mass uncharacteristically muggy with humidex values tipping into the upper 30s.