Bridger Teton Avalanche Center
WESTERN WYOMING AVALANCHE ADVISORY
Issued on Tue February 21, 2017 7:04 PM
Conditions were warm and windy today. The freezing level rose to around 8,000 feet this morning. Skies were cloudy with periods of mountain snow and valley rain overnight. Skies briefly became partly sunny before noon. In the afternoon slightly cooler air began to move into the region. Clouds and snow redeveloped. By early evening rain had changed to snow at the lower elevations.
Temperatures rose into the upper 20s and 30s in the mountains and into the 40s at the lower elevations. Snowfall totals since yesterday at noon range from 8 to 14 inches in the mountains. Strong winds from the southwest veered towards the west later in the day. Wind speeds averaged 25 to 45 with gusts from 60 to 110 miles per hour. These conditions created dense new wind slabs at the mid and upper elevations and created wet snow surfaces below an elevation of 8,000 feet.
FORECAST FOR Wednesday, February 22, 2017
A cold front will move through the area early this evening. This front is expected to bring another three to six inches of new snow to the mountains and one to three inches of snow to the valleys. Temperatures are forecast to be in the mid-teens at 10,500 feet by tomorrow morning and into the lower 20s in the valleys by daybreak. Daytime highs will remain in the 20s in the mountains and rise to near 30 degrees in the valleys. Winds will slowly decrease overnight and are expected to be westerly at 25 with gusts to 40 miles per hour in the morning and continue to slowly decrease during the day.
The general avalanche hazard is expected to be CONSIDERABLE to MODERATE depending on elevation and location. New soft slabs and older, dense slabs could be human triggered in steep avalanche starting zones. These slabs are generally expected to be one to two feet deep but could be up to four feet deep in some areas. Cooler temperatures are expected to decrease the potential for wet slide activity. The sensitivity of surface slabs to human triggers and the potential for wet slides to be a hazard will be dependent upon the amount of cooling that occurs and the amount of lighter density new snow that falls overnight.
TREND FOR Thursday, February 23, 2017 AND Friday, February 24, 2017
Colder conditions will prevail and help to decrease the general avalanche hazard. Skies will be mostly cloudy with periods of light snowfall.
For further information call 307-733-2664
To report an avalanche observation call 307-739-2607
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