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Updated: 11:45 AM GMT on August 05, 2015
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Weather Underground Forecast for Wednesday, August 05, 2015

A cold front will extend from the Mid-Atlantic to the central Plains on Wednesday, while high pressure builds across the Southwest.

A cold frontal boundary will stretch westward over the Mid-Atlantic, the Tennessee Valley, the middle Mississippi Valley and the central Plains. As this frontal boundary dips southeastward, it will collide with warm, muggy air from the Gulf of Mexico. This interaction will ignite rain and thunderstorms along and near the cold front. Severe thunderstorms will be possible in eastern Kansas, northeast Oklahoma, Missouri and northern Arkansas. These thunderstorms will be capable of producing large hail, dangerous straight line winds and isolated tornadoes. In addition, heavy rain will bring threats of flash flooding to southern Missouri, northern Arkansas, southwest Illinois and western Kentucky.

Showers and thunderstorms will persist across the Gulf Coast and the Southeast on Wednesday due to daytime heating and moisture from the Gulf of Mexico.

Meanwhile, a large area of low pressure will take shape over the upper Intermountain West and the northern Plains. This area of low pressure will usher rain and thunderstorms across a handful of states stretching from the Pacific Northwest to the upper Mississippi Valley. A ridge of high pressure will remain in place over the Southwest, keeping conditions warm and dry across the region. Temperatures will exceed 110 degrees across portions of the Desert Southwest.

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