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Updated: 12:00 PM GMT on May 30, 2015
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Weather Underground Forecast for Saturday, May 30, 2015

A cold front will slide across the eastern half of the country on Saturday, while an area of low pressure will affect the Northwest.

A cold frontal boundary will extend south southwestward over the central Great Lakes, the upper Midwest and the middle Mississippi Valley. As this frontal boundary transitions eastward, it will collide with warm, muggy air streaming northward from the Gulf of Mexico. Widespread showers and thunderstorms will develop to the east of this frontal boundary over the upper Midwest, the Northeast, the Deep South and the lower Mississippi Valley. Heavy rain associated with these thunderstorms will bring threats of flash flooding to a handful of states. Flash flooding will be possible in northeast Louisiana, northwest Mississippi, eastern Arkansas, western Tennessee, western Kentucky, northeast Kentucky, Ohio, West Virginia, western Maryland, Pennsylvania and southwest New York. To the west of the frontal boundary, temperatures will struggle to climb above the 50s, especially across the upper Midwest. In addition, an easterly wave of low pressure will bring rain and thunderstorms to South Carolina, southeast Georgia and Florida on Saturday.

Out west, an area of low pressure will sink south southeastward over the Pacific Northwest and the upper Intermountain West. This system will generate isolated showers and thunderstorms across the Pacific Northwest, the eastern Great Basin and the Rockies. Meanwhile, a warming trend will continue across the Desert Southwest, where temperatures are expected to climb into the triple digits. Temperatures will also jump into the 90s from central California to southern Oregon.

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