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 unusually early taste of summer is taking hold across the western U.S., with dangerous heat building through the Southwest and spreading into parts of the Plains over the next several days. While the biggest headline is the expanding heat, elevated to critical fire weather conditions will also raise concerns across the High Plains and southern Plains. Elsewhere, the Pacific Northwest stays wet for a bit longer, and the East remains stuck in a cooler, unsettled pattern with occasional rain and snow before conditions gradually settle.