A cold frontal system will move across the Plains and the Midwest on Tuesday, while a warming trend occurs over the West Coast.
A low pressure system will shift eastward across the northern Plains and the upper Mississippi Valley. This system will usher showers and thunderstorms across the region on Tuesday. A cold frontal boundary associated with this system will stretch south southwestward from the upper Mississippi Valley to the Four Corners. Numerous clusters of rain and thunderstorms will fire up along and near this frontal boundary. Locally heavy rain is expected for parts of the upper Midwest, the Mississippi Valley and the southern Plains. Prolonged heavy rain will bring threats of flash flooding to northwest Michigan, Wisconsin, southeast Minnesota, northwest Illinois, eastern Iowa, southwest Missouri, southeast Kansas, northwest Arkansas, Oklahoma and Texas. A ridge of high pressure will park itself over the West Coast. This high pressure system will keep most areas west of the Continental Divide dry on Tuesday. Afternoon temperatures will spike 10 to 20 degrees above normal.
Back east, showers and thunderstorms will wind down as a cold front moves over the western Atlantic. The remnant low associated with Tropical Storm Bonnie will keep stormy weather in the picture for the Southeast. Flash flooding will remain a threat for eastern North Carolina.
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