Bridger Teton Avalanche Center
WESTERN WYOMING AVALANCHE ADIVSORY
Issued on Fri November 21, 2014 5:29 PM
Cloud cover was interspersed with periods of sunshine over Western Wyoming on Friday. Mountain temperatures rose into the mid-20s as the valley climbed to near freezing. Southwesterly to westerly ridgetop winds ranged from 10 to 20 miles per hour.
Snow surfaces became damp on sunlit aspects during the heat of the day. In shaded terrain, snow surfaces remained dry, and recently developed surface hoar remained intact. Weak, faceted snow exists at the base of the snowpack on northerly aspects at the higher elevations.
FORECAST FOR Saturday, November 22, 2014
A Winter Storm Warning has been issued by the National Weather Service beginning midnight on Friday and continuing through Sunday morning. Snowfall is expected to begin late Friday night and intensify as the day progresses on Saturday. Southwesterly to westerly ridgetop winds will increase to 30 to 40 miles per hour by mid-day. Overnight lows in the mountains will be in the upper teens before rising into the mid-20s in the afternoon.
The general avalanche hazard is expected to be LOW early Saturday morning, but will quickly increase to MODERATE as new snowfall and strong southwesterly to westerly ridgetop winds combine to create unstable conditions. By Saturday afternoon, CONSIDERABLE avalanche hazard could exist. As new wind slabs build, they will become increasingly sensitive to human triggers. New snow will also add weight to existing weak layers near the base of the snowpack on shaded aspects at the higher elevations. Backcountry travelers venturing into avalanche terrain will need to monitor conditions closely and be willing to alter plans if circumstances warrant.
TREND FOR Sunday, November 23, 2014 AND Monday, November 24, 2014
Moderate to heavy snowfall will continue into the beginning of next week. The general avalanche hazard will increase during this period.
For further information call 307-733-2664
To report an avalanche observation call 307-739-2607
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