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As the polar jet stream makes a southward dip across the western U.S., cool, showery weather is underway. Western precipitation may linger through week’s end, especially in the central and southern Rockies, where significant snow should fall. Meanwhile, a pair of storm systems will emerge from the West during the next 5 days. The first system should cross the central Plains and upper Midwest around mid-week, accompanied by rain and snow.

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