An Atmospheric River is set to bring heavy rain to the coast and mountain snow to the Pacific Northwest and Northern California on Wednesday. Meanwhile, showers and thunderstorms will roll through the Lower Ohio, Tennessee, and Mississippi Valleys, bringing some heavy rain. There’s a chance of scattered flash flooding, especially in Louisiana and Mississippi. Across the central U.S. and Gulf Coast, temperatures will stay above average, while the Northeast and the West will see cooler air moving in.
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A big split in the weather pattern will drive the story over the next week. Early-season heat will continue across parts of the Southwest, Plains, and Mississippi Valley, with some areas running more like late spring than late March. At the same time, a strong cold front will sweep across the northern half of the country, bringing rounds of rain, some mountain and northern-tier snow, a chance for strong thunderstorms, and a sharp return to cooler air for the East. By early next week, warmth expands again from the West into the Plains, while increasing Pacific moisture may begin pushing back into the Southwest.