Students arrive at Natrona County High School as snow falls Friday morning, Feb. 28, 2014 in Casper, Wyo. / Alan Rogers AP
CHEYENNE, Wyo. (AP) - A potent snowstorm is bearing down on most of Wyoming.
The National Weather Service has issued a swath of winter storm warnings from Idaho to Nebraska. Only southeast and southwest Wyoming aren't under weather watches and warnings headed into the weekend.
The Weather Service says two air-masses are set to collide over Wyoming - one with warm, moist air from the Pacific and the other bearing cold air from Canada.
Forecasters say the result will be significant snowfall.
Snow already is falling in western Wyoming and spreading east. The forecast calls for 8-16 inches of snow in Jackson Hole, 6-12 inches in Casper and Sheridan, and somewhat lesser amounts in Lander, Riverton, Kemmerer and Gillette.
Avalanche danger already is rated between "moderate" and "considerable" in the mountains of western Wyoming.
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