Brett Anderson

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Extreme Flood Situation Unfolding in SW Alberta

June 20, 2013; 3:40 PM ET

Currently monitoring the heavy rainfall and flood situation across southwestern Alberta. Over 150 mm (that's 6 inches) of rain has already fallen in the mountains, with slightly less in the foothills as a potent storm over northwestern Montana tracks northeastward.

New YouTube video showing the raging waters threatening homes in Canmore, Alberta, today.

Even Bow Valley has been hit hard with the heavy rain with 124 mm as of last hour.

I can easily see another 25-50 mm or more of rain in areas especially to the SW of Calgary into Friday. The rain should begin to taper off Friday afternoon as the storm weakens and the easterly flow diminishes.

Major roads have been washed out, and rivers are flowing well out of their banks creating a dangerous situation, especially for areas just to the southwest and west of Calgary and into the mountains.

This storm is producing a deep, easterly flow in the atmosphere which is forcing warm, moist air into the higher elevations. As this air gets lifted it cools then condenses out as heavy rain.

The storm is tracking a little slow than what we though a couple days ago, but it looks like the track was on target along with the placement of heaviest rainfall.

I have been monitoring the Alberta Gov't site for emergency evacuations and you can follow these right here.

Links to Incredible images from Twitter users are below.........

Highway 1A washed out east of Exshaw this morning... which reminds me of our trip to Lake Louise a dozen years ago when the Trans Canada was cut off by a tremendous slide of mud and water from a heavy thunderstorms. We were on the highway about 40 km away when it happened.

The change in Cougar Creek near Canmore from yesterday to today. Incredible erosion! Check it out right here.

Raging Cougar Creek damaging homes... tons of debris in the water...

image

Nice house along the Cougar Creek in serious trouble...

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For more on this extreme flooding event you can follow this news story on AccuWeather.com.

The views expressed are those of the author and not necessarily those of AccuWeather, Inc. or AccuWeather.com

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About This Blog

Brett Anderson
Brett Anderson covers both short-term and long-term weather and storm forecasts for Canada in this blog for AccuWeather.com.