Heavy rain from an atmospheric river event brings 12 to 18 inches of rain to far northern California and southwest Oregon. Meanwhile, a storm system in the northern Plains will bring blizzard conditions to North Dakota and northwestern Minnesota. Heavy snow is expected to spread across parts of the central Appalachians starting Thursday, with another round of snowfall possible in Pennsylvania and nearby areas into Friday. Wind with heavy precipitation to hit British Columbia, snowfall for Alberta, Saskatchewan and Manitoba, wind in Quebec, and rain for parts of the Maritimes. Those are the biggest impact areas in this week’s weather briefing, but here are some other notables.
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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.