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[July 13, 2011]  (AP)  Widespread showers and thunderstorms will persist in multiple areas of the United States on Wednesday, while the Mid-Atlantic and Ohio Valley will see slightly cooler temperatures.

A low pressure system over Montana will push a frontal boundary through the northern Plains, kicking up showers and thunderstorms. In addition, low pressure spinning over Kansas will continue to bring widespread showers and thunderstorms to the central Plains and mid-Mississippi Valley. This system will be associated with strong winds, heavy rain and possible hail.

At the same time, low pressure off the coast of Maine will push a cold front through the Ohio Valley and Mid-Atlantic states, cooling temperatures by about 10 degrees. This cold front will also trigger thunderstorms over parts of the Tennessee Valley and Mid-Atlantic.

Meanwhile, high pressure will build over the Great Lakes, bringing sunny and dry conditions through most of the Northeast.

To the south, warm, moist air from the Gulf of Mexico will continue to be pushed onshore, triggering storm systems over the South and southern Florida. The South and Southeast will continue to see hot and humid weather, with high temperatures near 100 degrees and heat indexes up to 115 degrees.

In the West, monsoon moisture will persist for the Southwest, triggering scattered showers over most of the Four Corners. In addition, the rotation of a low pressure system over British Colombia will push moderate to light rainfall across the Pacific Northwest and Intermountain West. However, California and Nevada will see mostly sunny and dry conditions, with low clouds and fog along the California coastline.

Temperatures in the Lower 48 states Tuesday ranged from a morning low of 32 degrees at Truckee-Tahoe, Calif., to a high of 105 degrees at Houston.

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[Associated Press article from Weather Underground]

Copyright 2011 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

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