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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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.