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AP-The Nation's Weather

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Posted: Monday, June 30, 2014 4:08 pm

A strong low pressure system is inching across the northern tier of the country today, focusing over the upper Mississippi Valley and the western Great Lakes. A cold frontal boundary associated with this system is extending across the Great Basin, the central Rockies, the central Plains and the upper Midwest. As warm, humid air collides with this frontal boundary, strong to severe thunderstorms will develop across the nation's midsection. Severe thunderstorms will be possible across northern Texas, southeast Colorado, northern Oklahoma, Kansas, Arkansas, Iowa, Illinois, southern Wisconsin, northwest Indiana and southwest Michigan. These thunderstorms will be capable of producing large hail, dangerous straight line winds and isolated tornadoes. In addition, heavy rain associated with these thunderstorms could lead to flash flooding across the upper Mississippi Valley. Scattered showers and thunderstorms will also be possible over the northern Plains.

Meanwhile, an area of low pressure is inching southward along the coasts of Georgia and Florida today. This system will bring very stormy weather to the southeast, and will have a high, 60% chance to develop into a tropical cyclone. Disorganized showers and thunderstorms will also be possible across the Ohio Valley and parts of the Northeast.

Out West, a ridge of high pressure over the eastern Pacific will keep conditions mostly clear across the West Coast. Temperatures will approach 110 degrees across the Desert Southwest today.

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