Trick or treat? Well, both actually. Moderate to heavy snow is expected over parts of the Northern/Central Rockies and higher elevations of the Great Basin. Dry and windy conditions may produce elevated to critical fire weather conditions in portions of the Central and Southern High Plains and the Midwest. Much of the central/eastern U.S. can expect record high temperatures through Thursday.
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A strong Pacific storm will drench Northern California through midweek. An Arctic front follows this weekend with much colder air and a wintry mix for parts of the Great Lakes, Northeast, and Northern Plains.