The system began to affect southern Alberta on Friday night. One person was killed when heavy rain caused flash floods in Calgary.
By Saturday, it looked more like January than August on some highways around southern Saskatchewan as severe thunderstorms dumped heavy hail on the region.
An eyewitness said the hail was so thick, it was like driving through deep water. Numerous drivers opted to pull over and wait out the storm.
One cell showed signs of rotation, prompting Environment Canada to issue tornado warnings for Yellowgrass and Weyburn. A funnel cloud was sighted in Weyburn and winds gusted up to 95 km/h, knocking down numerous trees.
Fortunately, the storms mostly missed Regina, meaning outdoor performances scheduled for the Queen City Ex were able to go ahead as planned. Fans of Canadian rockers April Wine were undaunted by the scattered showers that moved through the area.
Rain was heavier northeast of the city, causing localized flooding in some residential neighbourhoods as sewers struggled to keep up with the deluge.
On Sunday night, a tornado touchdown was reported near Oak Lake, Manitoba, about 30 km west of Brandon. An RCMP official witnessed the twister, which prompted Environment Canada to issue a tornado warning for the area.
Environment Canada says the tornado touched down for about 30 seconds and no damage was reported.
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With files from Andrea Stockton