A cool and wet end to the week with scattered thunderstorms starting Thursday
Anchoring high pressure systems will hold that low in place and allow rain to be drawn in from the Pacific basin and wrap around the counter-clockwise rotation, pulling colder air in from the north.
Eventually, that system will start to track south and then east but before it does, heavy accumulations of rain are likely to fall west of the capital.
A cool and wet end to the week with scattered thunderstorms starting Thursday
Rainfall warnings (green), air quality statements (grey), and air quality warnings (purple) issued by Environment and Climate Change Canada on Thursday, Aug. 7, 2025.
Rainfall warnings have been issued by Environment and Climate Change Canada with the agency explaining between 50 to 75 millimetres is possible.
'Thunderstorms may help enhance rainfall totals in some locations this afternoon and evening,' with rain in that area expected to start to ease tonight and early Friday.
That system will edge along the foothills and through central and southern Alberta on Thursday, potentially bringing rain and thunderstorms as far south as Calgary.
Friday will include persistent rain across central and southern Alberta with between 5 to 10 millimetres possible for Calgary.
The daytime highs across the region will be below seasonal on Friday, but will warm up to seasonal values for Saturday and Sunday with more sunshine in the forecast.
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