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    Senior Member JohnDoe2's Avatar
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    Lethal blend of weather, geography caused Colo. floods

    Lethal blend of weather, geography caused Colo. floods

    Doyle Rice, USA TODAY 11:08 a.m. EDT September 15, 2013

    Boulder picked up almost nine times its average September monthly rainfall in about four days.


    Monsoon moisture flowing into Colorado from the south spawned the rain and thunderstorms that inundated the state this week.(Photo: National Weather Service)

    Story Highlights

    • Flash floods have hit Colorado several times in the state's history
    • Monsoon moisture from the south helped fuel this week's storms
    • Boulder is Colorado's most at risk city for floods.

      Colorado is no stranger to devastating and deadly flash floods, due to a lethal combination of geography and meteorology. When unusually heavy rain falls across the region, narrow canyons and steep mountains help funnel raging torrents of water down into the heavily populated foothills to the west and north of Denver.
    • One of them, the notorious "Big Thompson" flash flood of July 1976, killed at least 144 people north of Boulder. It caused "the worst natural disaster, in terms of documented lives lost, in Colorado state history," according to Boulder's Flood Safety Education Project website.
    • Boulder, specifically, is considered to be Colorado's "most at risk" city in terms of potential flood damage, notes Weather Underground weather historian Christopher Burt. This is because it rests against the mouth of a canyon (the Boulder Canyon) from which a creek (the Boulder Creek) bisects the heart of the town.
    • This week's rains and floods in Colorado were the result of a strong, slow-moving storm at upper levels of the atmosphere located to the west of the state, according to meteorologist Jeff Masters with the Weather Underground. The storm got trapped to the south of an unusually strong ridge of high pressure parked over Western Canada, he says.
    • The circulation around the storm tapped a plume of extremely moist, monsoonal air from Mexico that pushed up against the mountains and fell as rain on the already saturated ground, soaked from rain earlier in the week, Masters adds.
    • How much rain? From the afternoon of Sept. 9 through midday on Sept. 13, 14.62 inches of rain fell in Boulder. Average September rainfall in Boulder is only 1.63 inches, according to Weather Channel meteorologist Jon Erdman, adding that Boulder picked up almost nine times its average September monthly rainfall in almost four days.
    • Finally, winds 15,000 feet above the ground were generally blowing from southeast to northwest and were light, Erdman says. This allowed the rain and thunderstorms to linger over the foothills and Front Range urban corridor.
    • "This is a classic scenario for major flooding in northern Colorado," he says.

    • http://www.usatoday.com/story/weather/2013/09/15/colorado-floods-weather/2816051/
    Last edited by JohnDoe2; 09-15-2013 at 11:42 AM.
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    Senior Member JohnDoe2's Avatar
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    NPR

    See realtime coverage
    Suspected death toll rises from Colorado floods as nearly 500 unaccounted for
    CNN - ‎16 minutes ago‎
    Boulder, Colorado (CNN) -- "Mother Nature is not cooperating." That was the message Sunday from frustrated authorities battling even more bad weather in flood-hit Colorado. . .
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    Senior Member JohnDoe2's Avatar
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    ABC News



    See realtime coverage
    NWS says flooding historically 'significant'
    Boulder County Business Report - ‎1 hour ago‎
    BOULDER - Is this week's flooding in Boulder County a 100-year event? Five hundred? One thousand? Jim Keeney, weather program manager for the National Weather Service's central region, said the NWS hasn't made a determination because flooding is ...
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