CASPER, Wyo — The National Weather Service (NWS) in Riverton has issued a winter weather advisory into Sunday this weekend for areas including the Bighorn mountains and portions of Johnson County, while high winds impact travel in the southern portion of the state.
Interstate 80 & US Highway 30/287 between Laramie and Walcott Junction are closed to light, high-profile vehicles due to extreme blow-over risk.
6-12 inches of snow could accumulate in the Bighorns, NWS said, bringing below-average seasonal temperatures on Sunday. The heaviest snow is expected to fall in the northern half of the range.
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Wet, slick and foggy conditions are reported on routes including I-90, US 14, and US 212.
Granite, Powder River, and Baldy Passes will be slick to snow-packed at times: “Allow extra time to reach your destination, and exercise caution when traveling,” NWS said.
The advisory is in effect until 6:00 am Sunday . Below-average temperatures are expected throughout the central and western region through Sunday in the wake of the front.
Accumulations of 1-3 inches with are expected in northern Johnson County, including Buffalo. Rain and snow beginning late Friday night will transition to all snow on Saturday, with periods of light snow through Sunday morning. Certain areas in the foothills could see higher amounts of accumulation, NWS said.
National Weather Service (NWS) Cheyenne has expanded a high wind warning to include now Central Carbon and Central Laramie Counties including the cities of Rawlins and Cheyenne Saturday morning. Winds have increased in these areas this morning with gusts of 55 to 65 mph reported, NWS said.
The warning is in effect until 6:00 pm Saturday for the South Laramie Range and adjacent foothills including Interstate 80 between Laramie and Cheyenne.
Gusts up to 80 mph near the Elk Mountain and Arlington area were reported Saturday morning morning. Periods of strong wind gusts up to 65 mph are expected further east for portions of the I-25 corridor and the I-80 Summit until noon Saturday, NWS said.