Bridger Teton Avalanche Center
WESTERN WYOMING AVALANCHE ADVISORY
Issued on Thu March 22, 2018 6:22 PM
A trough of pacific moisture brought snowfall to the upper elevations and rain to the valleys starting at 3 o’clock this morning. The rain level reached over 9000 feet but for the most part snow fell above 8500 feet and upper mountain study plots have received 5 inches of snow that contained approximately 0.75 inches of moisture. Although rain fell below 8500 feet, the rain line has been lowering since late afternoon. At the base study plot at the Jackson Hole Mountain Resort, 0.34 inches of rain has fallen since last night. On the summit of Rendezvous Mountain, south-southwest winds had twenty to thirty mile per hour averages and temperatures reached the upper twenties. Temperatures at the base reached thirty nine degrees today.
Above 8500 feet new wet and heavy has fallen over lighter snow that lies over crusts and facets. Small wet slabs were reported to be sensitive in very steep terrain and cliff areas with depths of six to 12 inches. Below that elevation the rain has weakened the upper portion of the snowpack. At the lowest elevations where snow depths are relatively shallow, the entire snowpack became rotten and unsupportive due to the rain and warm temperatures.
FORECAST FOR Friday, March 23, 2018
Precipitation is to continue through the night as the system slowly tracks easterly. Four to six inches of snow is expected at the upper elevations by morning with the chance for periods of snowfall to continue through the day. The snow/rain level should drop to the valley floor overnight and then rise during the day as moisture diminishes. Daytime highs should reach the upper twenties to low thirties in the mountains and mid-forties in the valleys.
The general avalanche hazard is expected to be moderate above 8000 feet all day and could be rated as Considerable if overnight snowfall amounts are higher than expected. Slabs formed by recent snowfall will be sensitive in steep terrain and could be triggered as soft or wet slabs with depths to two feet. Below that elevation, the danger is expected to rise from Low to Moderate as warm temperatures break down surface crusts and further weaken the snowpack.
TREND FOR Saturday, March 24, 2018 AND Sunday, March 25, 2018
Colder and drier conditions are expected over the weekend. The avalanche hazard is expected to decrease overall but could have heightened periods during afternoon warming.
For further information call 307-733-2664
To report an avalanche observation call 307-739-2607
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