Bridger Teton Avalanche Center
WESTERN WYOMING AVALANCHE ADIVSORY
Issued on Sun January 25, 2015 6:47 PM
The eastern edge of a high pressure ridge is over Western Wyoming. Warm air advection in a northwest flow along the edge of that ridge brought some low clouds to the region today. Temperatures rose into the mid-20s to low 30s in the mountains and into the 30s in the valleys. Winds were west-northwest at 15 to 30 miles per hour with higher gusts.
Today’s warm temperatures and sunshine dampened snow surfaces on steep sunlit aspects. Snow surfaces remained dry on shaded aspects. At the upper elevations strong west-northwest winds hardened snow surfaces in exposed terrain. Persistent weak layers comprised of buried surface hoar exist beneath the snow surface and have been the bed surface for recent avalanche activity.
FORECAST FOR Monday, January 26, 2015
The region will experience dry and very warm temperatures under a building high pressure ridge. Temperatures will become inverted overnight. On Monday skies will be mostly sunny above areas of morning valley fog. Temperatures at dawn are forecast to be in the teens in the valleys and in the mid-20s at the higher elevations. Daytime highs will approach 40 degrees in the mountains and rise into the low to mid 30s in the valleys. Winds will decrease to around 5 miles per hour and back to the south.
Warm temperatures and sunshine will cause the hazard to increase during the day. Surface slabs up to 18 inches in depth will become increasingly sensitive to human triggers in steep terrain and cliff areas as the day progresses. Some potential may exist, in isolated areas, for these slabs to step down to deeper layers of faceted snow. The general hazard is expected to be MODERATE.
TREND FOR Tuesday, January 27, 2015 AND Wednesday, January 28, 2015
Dry and warm conditions with mostly clear skies and temperature inversions will dominate the region until a warm storm system moves into the region from the southwest on Tuesday evening. The avalanche hazard will increase during the warmest portions of the days.
For further information call 307-733-2664
To report an avalanche observation call 307-739-2607
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