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Weather Underground National Forecast for Tuesday, August 26, 2014

By: nationalsummary , 10:13 PM GMT on August 25, 2014

Weather Underground Forecast for Tuesday, August 26, 2014

A cold front will extend from the central Plains to the central Great Lakes on Tuesday, while a low pressure system will develop over the Great Basin.

An area of low pressure will move north northeastward over the Great Basin on Tuesday. This system will interact with monsoonal moisture over the region, which will initiate widespread thunderstorms over the Great Basin, the Desert Southwest and the Rockies. Heavy rain associated with these thunderstorms will bring a chance of flash flooding to Arizona, southwest Utah and southeast Nevada. A ridge of high pressure will remain parked over the eastern Pacific, keeping conditions mostly clear across the West Coast.

Meanwhile, a separate area of low pressure will continue to drift northeastward over central and eastern Canada. A cold frontal boundary associated with this system will extend southwestward over the central Great Lakes, the upper Midwest and the central Plains. An abundance of moisture will move northward from the Gulf of Mexico, which will collide with this frontal boundary to trigger numerous areas of thunderstorms. The strongest thunderstorms will focus over the nation’s midsection. Flash flooding will be possible over northeast Colorado, northwest Kansas, Nebraska and Iowa. Scattered showers and thunderstorms will also develop over parts of the Tennessee Valley and the Ohio Valley. The majority of the Southeast will avoid wet weather on Tuesday, although sea breeze induced thunderstorms are expected across Florida.

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8:13 AM GMT on August 27, 2014
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This is the blog for the United States' national forecast. These summaries are by Weather Underground forecasters and are updated twice each day.

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