Alberta is headed for a weather tailspin with a dramatic drop in temperatures, heavy rain, and even some high-elevation snow along the foothills. Winter storm watches and rainfall warnings are in place for the regions that will be impacted by the system. Severe thunderstorms could occur in parts of Alberta and central Saskatchewan. Details and timing, below.
Visit our Complete Guide to Summer 2021 for an in-depth look at the Summer Forecast, tips to plan for it and much more!
SEASON REWIND WITH THUNDERSTORMS, TEMPERATURE DROP, HIGH-ELEVATION SNOW
A broad trough continues to be situated over the western Prairies, giving way to widespread scattered showers and thunderstorms. Across the south, storms off the southern foothills on Monday, expected to remain non-severe in nature, including the Calgary area.
Severe storms could occur along the Alberta/Saskatchewan border.
Conditions will take a surprising twist: Temperatures will take a considerable nosedive by Monday morning in Alberta, dropping down to the single digits across the province.
The 30-degree heat, however, will return to southern Saskatchewan and Manitoba.
An upper disturbance will move across the region and will force incoming moisture up the foothills including the mountain parks like Jasper, where terrain-driven snowfall will occur. There is still some uncertainty in the total amount of snowfall expected.
"Rapidly accumulating snow could make travel difficult over some locations. Visibility may be suddenly reduced at times in heavy snow," Environment Canada warns.
The system will bring heavy rainfall to areas east of the slopes. This is where rainfall warnings are in place and lash flooding is quite possible with up to 80 mm of rain or more.
"Heavy downpours can cause flash floods and water pooling on roads. Don't approach washouts near rivers, creeks and culverts," Environment Canada says in the warning.
Both the snow and rain are expected to linger in some areas until Tuesday morning.
The jet stream pattern will also become favourable for more widespread unsettled weather this week, with forecasters watching a potentially significant system during the second half of the week.
It could bring widespread heavy rain and thunderstorms, though it's still too early for exact details on that setup and what areas will see the heaviest rain.
Stay tuned to The Weather Network for the latest forecast updates.