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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This week kicks off with widespread showers and a few storms pushing across the Mid-South to the Mid-Atlantic, bringing the potential for heavy rain and some localized flooding. Temperatures will trend cooler across much of the central and eastern U.S., while the Pacific Northwest faces another round of rain and high-elevation snow. Meanwhile, a dangerous Category 5 Hurricane Melissa is set to cross Jamaica and Cuba, posing serious hazards in the Caribbean.