Sunday looks to be a stormy day across the southern Prairies, with a threat for severe thunderstorms spanning the Highway 1 corridor from Calgary to Winnipeg. Another system arriving on Monday will bring significant and widespread heavy rainfall to the region, with an extended period of very heavy rain possible in Alberta through midweek. More on what you can expect in the days to come, below.
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SUNDAY: SEVERE STORMS POSSIBLE FROM CALGARY TO WINNIPEG
A widespread risk for thunderstorms will span the Prairies for our day on Sunday.
There should be enough energy present for some thunderstorms to reach severe limits across southern portions of Alberta, Saskatchewan, and Manitoba, including the entire Highway 1 corridor between Calgary and Winnipeg.
The strongest thunderstorms in this region could produce large hail and strong wind gusts. Some rotation can’t be ruled out.
Beyond Sunday’s storm threat, we have to start looking ahead to the next major storm system arriving early next week.
MONDAY THROUGH WEDNESDAY: MAJOR SYSTEM APPROACHES THE WEST
Special weather statements are in effect for the Alberta foothills, including the city of Calgary, ahead of the significant storm taking aim at the Prairies this weekend.
“A long duration rainfall event will impact the eastern slopes of the Rockies on Monday and Tuesday,” Environment and Climate Change Canada (ECCC) said in its statement. “Monitor your local forecasts and warnings for the most up to date information.”
A low-pressure system will cross the border on Monday and meander over the central Prairies for several days. This low will lead to copious amounts of rainfall for some areas, with the greatest rainfall totals likely targeting the southern Alberta foothills.
Persistent upsloping winds will fuel drenching rains beginning Monday and lasting into Wednesday for some areas. We can expect significant rainfall totals as a result of this prolonged rain event. Stay alert for the potential for flooding in some areas.
This region certainly could use the rain—we’re mired in exceptional drought conditions across the western Prairies—but too much rain all at once isn’t quite the answer.
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The approaching system will also send temperatures falling well below seasonal for the middle of June. After a seasonable weekend, daytime highs in Calgary will fall into the mid-teens through the middle of the week.
Cooler temperatures will allow hefty snowfall totals to fall at higher elevations, with locations above 1200-1300 m at risk for seeing accumulating snow for the duration of the storm.
Thumbnail courtesy of Roly, taken in Granum, Alta.
Stay tuned to The Weather Network for the latest updates on conditions across the Prairies.