From the National Weather Service Riverton, Wyoming. For: Rock Springs, Green River, Flaming Gorge, and East Sweetwater County:
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Snow will develop Sunday across Sweetwater County. The snow will continue into Sunday evening. Around 2 to 4 inches of snow could fall by midnight Sunday night. Exposed areas will likely see considerable blowing and drifting snow as northeast winds increase to 25 to 40 mph. Light snow and strong northeast wind will continue Monday as more and more colder air is ushered in.
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High temperatures will struggle to get above 10 degrees Monday along with wind chills of 10 to 20 below zero. Many areas Monday night should see temperatures approaching 10 to 15 below zero.