A powerful winter pattern is unfolding across the U.S. this week, with heavy snow blanketing the Cascades and northern Rockies, a swath of freezing rain and snow from the Great Lakes to coastal Maine, and record warmth building across the Central and Eastern U.S. The end of the week brings another potent storm system—with the potential for flooding rain in the Tennessee Valley and accumulating snow into the Upper Midwest.
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An active and impactful weather pattern is setting up across much of North America through next week. Multiple rounds of severe thunderstorms are expected from the eastern Canadian Prairies, U.S. Plains into the Mississippi Valley, bringing the risk of damaging winds, large hail, and tornadoes. Heavy rainfall may lead to localized flooding from the Northern Plains to the Southeast, while wildfire concerns continue across the Four Corners region. At the same time, summer heat is building, with the East experiencing its hottest temperatures of the season late this week before above-average warmth expands westward during the weekend.