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Snow west of Calgary Tuesday morning with frost advisories possible again overnight

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As expected, cooler overnight temperatures in the region prompted frost advisories overnight and brought snow to areas west of Calgary.

Precipitation attached to a frontal system continued to produce rain early Tuesday with temperatures (mostly tied to elevation) dictating the rain vs. snow presentation at the surface.

As of 6:30 a.m, communities like Banff and Crowsnest Pass were reporting temperatures of 0 C and it was -2 C in Jasper.

Overnight cooling from Tuesday to Wednesday could mean a similar start on Wednesday with frost possible and mixed precipitation in higher elevation or low-lying areas.

This cooler weather in our area is one of the contributing factors for the heat dome across Central Canada and the Northeastern United States.

An Omega block is funneling warm air in from the Gulf and around a larger high pressure system. On either side there are anchoring lows – including the ones drawing colder air in to southern Alberta.

This block is not as balanced as the one that impacted the Prairies in 2021, so it is expected to break down and move east.

When that happens (later Wednesday) southern Alberta will see a return to warmer weather with daytime highs and overnight lows trending above seasonal until early next week.

For Tuesday, there is a slight chance of scattered showers or some isolated thunderstorms throughout the region – including in Calgary. But the chance of any severe development remains unlikely.

Sunshine will return starting on Wednesday, and outside of a slight chance of rain on Friday – should stick around for the next five to seven days.

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