High River, a town in southwestern Alberta, found itself engulfed in raging floodwaters, and more than half the town’s residents had to be rescued from their rooftops.
Environment Canada – the Canadian weather service – says some areas have received over 100 mm (3.9″) of rain since Wednesday night due to a stubborn low pressure system. The agency has issued rainfall warnings for three regions in southwestern Alberta, including Banff National Park, and up to another 40 mm (1.5″) is forecast through tomorrow.
In a tweet, Rob Davis – a meteorologist with The Weather Network – wrote that the Bow River was flowing through Calgary at an all-time record of 1300 cubic meters per second.
Calgary has received 120.6 mm (4.7″) of rain this month, which is about 51 percent above its June average. Higher elevation areas were in the bulls-eye for rain yesterday, with some places southeast of Calgary recording over 130 mm (5.1″) in 24 hours (see map).
A remote controlled tricopter captures dramatic flood in Okotoks, Alberta via YouTube
The trough bringing cool, unsettled weather to western Canada comes at the same time an expansive ridge of high pressure has brought record heat to Alaska and the Canadian Arctic.
Fortunately, the sudden deluge will begin to subside over the weekend, giving flood-stricken areas a chance to clean up from the damage.