A dynamic weather pattern will dominate the U.S. this week. Scattered showers and lake-effect thunderstorms will linger across the Great Lakes, while breezy, cooler air spreads into the Northeast. The Southern Plains face a growing flood risk by Friday as heavy rain and storms roll in from Oklahoma to Louisiana. Meanwhile, Tropical Storm Melissa has formed in the Caribbean, with potential impacts for Haiti and Jamaica by late week—though the track remains highly uncertain. Out West, a shift toward colder weather will bring rain to the Pacific Northwest and snow to the Rockies by the weekend. And in southern Texas, unseasonable heat continues with record highs and heightened fire weather concerns. Across Canada, areas of strong wind for the West along with heavy precitation from British Columbia to the mountainous areas of Alberta. Pockets of heavy moisture will hit sections of Ontario and Quebec.
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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.