Much of the Lower 48 and Western Canada is kicking off the week with unseasonably warm weather, but a midweek storm system will flip the pattern—ushering in colder air and a round of wintry weather from Central to Eastern Canada, the Upper Midwest into the Great Lakes and Appalachians. While major snow looks limited, areas downwind of the Great Lakes could see more persistent lake-effect snow as the pattern turns colder.
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An active weather pattern is unfolding across much of the United States this week. Severe thunderstorms and flooding rains will develop from the Plains into the Midwest, while late-season snow and icy conditions affect parts of the Great Lakes and northern New England. Meanwhile, the Pacific Northwest faces heavy rain and mountain snow, and unusually warm spring temperatures continue across much of the East and Southwest.
Several storm systems will move across the country through mid-week and into the weekend, bringing a mix of severe storms, winter weather, heavy rain, and record-setting warmth depending on location.