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Imminent Flood Threat in the U.S. Midwest

Posted by feww on March 18, 2010


South and East Also at Risk: NOAA

At least a third of the contiguous United States has an above average flood risk in 2010

The highest flood threats are in the Dakotas, Minnesota and Iowa, including along the Red River Valley where crests could approach the record levels set in 2009.

Major flooding has begun and is forecast to continue through spring in parts of the Midwest according to NOAA’s National Weather Service. The South and East are also more susceptible to flooding as an El Niño influenced winter left the area soggier than usual.

US Flood Risk Map. Areas left blank on the map are at “average risk.” Sourec NOAA. Click image to enlarge.

The forecast of imminent Midwest flooding is  supported by a snowpack more extensive than in 2009, which contains more than 10 inches (25cm) of liquid water in some locations. Until early March, consistently cold temperatures limited snow melt and runoff. These conditions exist on top of: above normal streamflows; December precipitation that was up to four times above average; and the ground which is frozen to a depth as much as three feet below the surface, NOAA said. More …

Related Links:

Current NWS Weather Hazard Warnings (U.S.)

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