A potent Pacific storm is bringing a wet and wintry start to the week for the western U.S., with Southern California and the Southern Rockies facing the risk of flash flooding. Heavy snow is piling up in the Sierra Nevada and will shift to the Northern Rockies by Wednesday. As the week continues, the storm moves east, bringing widespread rain to the Plains, Mid-South, and eventually the East Coast. Meanwhile, another storm system is set to push into the Pacific Northwest by late weekend, keeping the unsettled weather going into next week. Tropical Storm Lorenzo remains out in the Atlantic with no expected U.S. impact. Across Canada, heavy western moisture, including snow in the mountains. Elsewhere, semi-heavy moisture will move across the central and eastern Prairies toward Ontario. Also, widespread frost and freezing temperatures are possible for all provinces.
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A highly active weather pattern is setting up across the southern and central United States this week. The biggest concern is a prolonged flooding threat from South Texas through Louisiana and into portions of the Lower Mississippi Valley, where repeated rounds of tropical downpours could produce significant flash flooding. Meanwhile, a powerful storm system will bring the risk of severe thunderstorms from the Midwest into the Great Lakes and Ohio Valley on Wednesday, with damaging winds, large hail, and a few tornadoes possible. While heat eases somewhat across the West, temperatures will remain above average in parts of the Pacific Northwest and California before additional cooling arrives later this week.