Santa Ana winds fuel critical fire weather conditions in Southern California. Record highs, then widespread heavy rain and severe thunderstorm threats, will impact the East Coast through New England into tonight. A surge of arctic air will hit Saskatchewan, Manitoba, Ontario, the Northern Plains and Midwest, producing lake-effect snow downwind of the Great Lakes and rain/snow for eastern Canada from today through Saturday. Here are other items to keep track of in this week’s Weather Watch.
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A big split in the weather pattern will drive the story over the next week. Early-season heat will continue across parts of the Southwest, Plains, and Mississippi Valley, with some areas running more like late spring than late March. At the same time, a strong cold front will sweep across the northern half of the country, bringing rounds of rain, some mountain and northern-tier snow, a chance for strong thunderstorms, and a sharp return to cooler air for the East. By early next week, warmth expands again from the West into the Plains, while increasing Pacific moisture may begin pushing back into the Southwest.