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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January is closing out with no shortage of winter weather. Frigid temperatures will dominate the eastern U.S. for the rest of the week as another round of arctic air spills southward starting Friday. The cold could break more records as far south as Florida. Meanwhile, forecasters are closely tracking a potentially significant East Coast winter storm this weekend that could bring heavy snow, strong winds, and coastal flooding from the Carolinas to New England. Out West, a soggy pattern continues in the Pacific Northwest, with rounds of rain and mountain snow.