One word. Brrrr. This week, an Arctic air mass is heading south through the central U.S., bringing some seriously cold weather, with record-breaking low temps likely. Expect sub-freezing temperatures to stretch all the way down to the Gulf Coast. On top of that, heavy snow is moving from the Rockies today, heading across the central Plains, Ozarks, Tennessee Valley, North Carolina, and into the southern Mid-Atlantic states by Wednesday.
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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.