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Weather Underground Forecast for Saturday, September 20, 2014
An area of low pressure will move across the Great Lakes on Saturday, while tropical moisture will linger over the southern Plains.
A low pressure system will move eastward across the northern Great Lakes on Saturday. This system will usher wet weather across parts of the northern Plains, the upper Midwest, the Great Lakes and the Northeast. Additionally, a cold frontal boundary will extend south southwestward over the upper Mississippi Valley, the central Plains and the southern high Plains. Strong to severe thunderstorms will develop ahead of this frontal boundary over a handful of states. Severe thunderstorms will be possible over eastern Iowa, northern Illinois, southeast Wisconsin, northern Indian and southwest Michigan. These thunderstorms will be capable of producing large hail, dangerous straight line winds and isolated tornadoes.
To the south, tropical moisture associated with the remnants of Odile will continue to linger over parts of New Mexico and Texas. Heavy rain will bring a chance of flash flooding to portions of northern Texas. Scattered showers and thunderstorms will also be possible across the Southwest and the Great Basin. High pressure will keep conditions mostly clear across the upper Intermountain West, the Pacific Northwest and the West Coast.
The tail end of a cold front will shift across the Southeast and the Mid-Atlantic, producing isolated thunderstorms from the eastern Gulf Coast to the Carolinas on Saturday.