
Midsummer cooldown set to chill Alberta, snowflakes possible
A short-lived chill will descend on parts of Alberta this week
Change is coming, Alberta. Once we get through a severe thunderstorm threat on Sunday, temperatures are going to dive heading into the start of the new workweek.
Folks across southern Alberta can expect temperatures 10 or more degrees below seasonal for the middle of July—all the more impressive given that warmer temperatures will bathe northern portions of the province.
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Sunday severe weather potential
The final day of the Stampede will see a threat for strong to severe thunderstorms develop across the southern foothills.

A low-pressure system will drag a cold front into the region, which could spark some storms around and south of Calgary.
The strongest of these storms could produce large hail, strong wind gusts, and heavy rainfall.
Temperatures dive on Monday and Tuesday
Moisture spilling over the mountains from British Columbia will fuel a round of widespread and steady rainfall across southern Alberta and across the Rockies for our day on Monday. Some embedded thunderstorms are also possible.

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As a cold front dips across the region, freezing levels are expected to drop to around 2500 m, which could lead to some conversational snow at higher elevations. Onlookers vacationing around Jasper National Park may experience some snowfall from this system.
The same front bringing sporadic snow to the mountains will send temperatures plummeting at lower elevations across southern Alberta. Expect readings to come in 10 or more degrees below seasonal.

Calgary is looking at a high temperature of just 14°C on Monday, an overnight low of 9°C by Tuesday morning, followed by a daytime high on Tuesday only reaching 16°C.
The same high-pressure system responsible for dragging the cold air south will funnel warm air through B.C. toward northern Alberta, allowing Grande Prairie to come in at a comfortable 25°C on Tuesday.
While it’ll be chilly enough to need a jacket, this is far from the coldest we’ve been in July across the region. Calgary’s coldest July day on record occurred on July 3, 1884, when the high temperature only reached 7.3°C. Banff’s coldest-ever July day was July 3, 1999, with a daytime reading of just 4.9°C.
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