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WESTERN CANADA | Thunderstorm Outlook

Severe storms organize in Alberta, heavy rain in the north


Digital writers
theweathernetwork.com

Monday, July 23, 2018, 11:41 AM - After a weekend packed with powerful thunderstorms on the Prairies, a tornado turned into a waterspout on Sunday in southern Manitoba. While the storms responsible for the tornadic event have cleared the region, another thunderstorm risk blooms over Alberta on Monday and settles into the southern half of the province, with hail and high winds being the primary concern. More on the timing and impact, below. 

Keep on top of active weather by visiting the ALERTS page.


WEATHER HIGHLIGHTS

  • Confirmed tornado at Lake of the Prairies in Manitoba on Sunday at 2:40 pm CT, lasting a few minutes, mainly over water
  • Thunderstorm risk on Monday for southern Alberta, risk for severe storms in the foothills and QEII corridor
  • Cooler than normal temperatures persist this week as an upper low looms overhead

THUNDERSTORM RISK RETURNS TO ALBERTA

A much quieter day across the Prairies on Monday, apart from Alberta as westerly flow aloft overrides east surface winds in the south, creating a moderate amount of shear (atmospheric spin) over the region, allowing for more organized convection and the risk for isolated severe storms.

Thunderstorms will initiate along the southern foothills into the early afternoon hours and trek eastward through the day, likely reaching the Calgary region in the mid to late afternoon. Strong wind gusts of 90 to 100 km/h are possible, along with small hail and heavy downpours. Isolated severe storms may develop in the region highlighted below, which includes the southern foothills and extends into the QEII.

The cluster of showers and embedded thunderstorms will expand east for the evening and overnight hours, crossing the Saskatchewan border.

WATCH BELOW: THUNDERSTORM TIMING IN ALBERTA


HEAVY RAIN CONTINUES FOR THE NORTH

Over 100 mm of rain fell in parts of northwestern Alberta, including Hendrickson Creek and over 80 mm in Grande Cache from Thursday to Saturday last week. The slow-moving low has since pulled out of Alberta, but will continue to spin and wring out over northern Saskatchewan and Manitoba through Wednesday. 

(ICYMI: Rare 'roll cloud' swoops through Alberta skies on Wednesday)

Check back for updates as we continue to monitor the forecast.

WEEKEND RECAP

A 'marathon of storms' began last week and peaked in intensity this weekend, with multiple reports of wind and hail damage and at least one confirmed tornado.

On Sunday afternoon around 2:40 pm local, a tornado touched down in southwestern Manitoba at Lake of the Prairies (west of Dauphin) and spent most of its lifetime over water. Luckily, no damage was reported and as a result, no rating for the twister was given.

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