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 series of Pacific storms is taking aim at the Northwest this week, delivering heavy rain, mountain snow, and gusty winds that could lead to flooding. While the West braces for more moisture, the Central and Western U.S. will bask in record-challenging warmth, with temperatures soaring 15 to 25 degrees above normal. Meanwhile, the chill that's gripped the Eastern U.S. finally begins to ease midweek, ushering in a brief break from the Arctic air. Flash freeze, snow, and wind will hit much of the Canadian Prairies, first with Alberta on Wednesday, then spreading eastward.