Bridger Teton Avalanche Center
WESTERN WYOMING AVALANCHE ADIVSORY
Issued on Fri November 27, 2015 6:21 PM
Western Wyoming was under clear skies on Friday as high pressure resided over the region. Mountain temperatures rose into the low teens as the valleys climbed into the low 20s. Easterly ridgetop winds at 20 to 30 miles per hour in the morning hours decreased to 10 to 20 later in the day.
The early season snowpack continues to facet. In general, the faceting process correlates to temperature gradients within the snowpack. Cold air temperatures and shallow snow depths result in high temperature gradients, and faceted crystals up to three to four millimeters can be found in mountain terrain with less than six inches of snow. In most areas, where the mountain snowpack is between 18 and 24 inches deep, faceted crystals are around 1 to 2 millimeters. Density also plays a role in faceting. Low density snow facets more quickly because there is ample pore space into which these crystal can grow. Dense snow in contrast, such as wind pack, has less pore space, and the faceting process is slowed. During your travels, take note of this process, and notice the high degree of spatial variability that exists so far this season.
FORECAST FOR Saturday, November 28, 2015
Dry conditions are expected Friday night and through most of the day on Saturday. During the day on Saturday, cloud cover will increase as moisture moves into the area. Overnight lows in the mountains will be in the single digits before rising into the mid-teens in the afternoon. Easterly to northeasterly ridgetop winds will range from 10 to 20 miles per hour.
The general avalanche hazard is expected to be LOW on Saturday. Mostly stable snow is prevalent throughout the region. However, backcountry travels venturing into very steep and heavily wind loaded terrain features might be able to trigger a pocket of wind slab up to 18 inches deep. Remember, the snowpack is still very shallow; rocks, downed trees and stumps lurk beneath the snow surface.
TREND FOR Sunday, November 29, 2015 AND Monday, November 30, 2015
The chance for light snow showers will increase Saturday night and continue through Monday. Similar avalanche conditions are expected until the next significant loading event occurs.
For further information call 307-733-2664
To report an avalanche observation call 307-739-2607
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