Oct 25, 2010

Major Storm Hits Midwest Tonight

A strong low pressure area now over the Northern Plains is forecast to deepen to 959 mb over International Falls by 0Z Wed (7PM Tuesday CDT), possibly producing a derecho which will start across Iowa/Illinois tonight, and blizzard conditions in North Dakota.This storm has already prompted high wind watches and warnings (brown) from the Dakotas to Ohio, storm warnings (purple) for Lakes Superior and Michigan, winter storm warnings (pink) for most of western Colorado, and freeze warnings for the northwest Texas Panhandle:Temperatures across eastern Iowa and Northern Illinois may actually rise overnight tonight. The NAM forecast sounding for Davenport shows very strong low level unidirectional wind shear, and surface-based instability even at 12Z, suggesting a high potential for damaging wind.

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