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Updated: 9:00 AM GMT on July 29, 2015
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Weather Underground Forecast for Wednesday, July 29, 2015

A trough of low pressure will move over the upper Midwest, while a ridge of high pressure will build across the southern Plains .

An area of low pressure will shift eastward over the northern Plains and the upper Midwest. This system will bring gusty winds, as well as rain and thunderstorms to region on Wednesday. In addition, temperatures will be 10 to 20 degrees below normal across the north central portion of the country. A cold frontal boundary associated with this system will extend southwestward over the midwest and the Plains. As this frontal boundary transitions eastward, it will initiate a line of showers and thunderstorms. Just to the south of this system, a ridge of high pressure will linger over the southern Plains and the lower Mississippi Valley. This high pressure system will act as a pinwheel, ushering monsoonal moisture over the Southwest and the southern high Plains. Daytime heating and monsoonal moisture will aid in the development of showers and thunderstorms from southern California to the southern high Plains. Flash flooding will be possible in northern New Mexico, southeast Colorado, northwest Texas and western Oklahoma on Wednesday. In addition, high pressure over the eastern Pacific will bring above normal temperatures to the Desert Southwest and the Great Basin.

Meanwhile, an area of low pressure will deteriorate over the southeastern corner of the country, but will continue to be the focal point for rain and thunderstorms over the southern Mid-Atlantic and the Southeast. Warm, humid conditions will persist across the southern and central Plains, the middle and lower Mississippi Valley and the Deep South.

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