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Tuesday, Aug 14, 2012 8:45 AM UTC

The nation’s weather

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Topics: From the Wires,

Weather Underground Forecast for Tuesday, August 14, 2012.

Active weather will move from the Eastern Valleys and toward the East Coast on Tuesday. A low pressure system advances northeastward up the Ohio River Valley toward the Northeastern US. A cold front associated with this system will extend down the East Coast, kicking up scattered showers and thunderstorms from the Northeast through the Gulf states. The tail end of this front will extend southwestward and linger over Texas. Moisture from the Gulf of Mexico and Atlantic Ocean will feed energy into this frontal boundary. There is a slight chance that these storms will turn severe across parts of the Northeast and the Mid-Atlantic states. Expect periods of heavy rainfall with gusty winds and possibly large hail in these areas.

Behind this system, another cold front will drop across the Northern US, pulling cooler air in from Canada. This will maintain slightly cooler and more comfortable temperatures across the Midwest and Great Lakes. Further west, a trough of low pressure moves off the Northern Rockies and into the Northern Plains. This will bring a slight chance of showers and thunderstorms to the Dakotas and Central Plains, moving into the Upper Midwest in the evening hours.

Meanwhile, the West Coast will see the beginning of a gradual cooling trend as a ridge of high pressure starts to weaken and a low pressure off the coast edges eastward. Coastal areas will be cloudy and cooler, while inland areas will remain hot and sunny. Temperatures in the Lower 48 states Monday have ranged from a morning low of 32 degrees at Stanley, Idaho to a high of 114 degrees at Thermal, Calif.

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