Wind slabs that developed at higher elevations late yesterday may be reactive to human triggering today. These wind slabs rest on old snow surfaces that are comprised of crusts and weak, faceted snow grains on many aspects. Northerly aspects at higher elevations may be further wind loaded this afternoon as new snow arrives. Evaluate the snow and terrain carefully and consider the consequences of triggering even a small avalanche. The general avalanche hazard is moderate above an elevation of 9,000 feet and low below that elevation where the snow cover remains thin.
Pockets of wind slab formed by south-southwest to southwest winds could be human triggered on leeward aspects at the upper elevations. These slabs could be up to 18 inches deep.
( Discussion is generated from the previous day's afternoon forecast. )Snowfall is to increase overnight and continue through tomorrow. The National Weather Service has issued a winter weather advisory for most of northwest Wyoming. Over a foot of new snow could fall in favored mountain locations by Wednesday morning. Southwest winds are to have averages of 20- 30 mph during the day on Tuesday. Temperatures during the day are to be on the warm side, with highs at the upper elevations in the mid-twenties while valleys reach the mid-thirties. The forecast will be Moderate above 9000 feet. The size and sensitivity of wind slabs will increase throughout the day as strong winds continue to load avalanche starting zones. These slabs could have depths to over 2 feet. Backcountry travelers should analyze terrain and the snowpack in a specific location before making the decision to ski or ride any upper elevation starting zone. Below 9000 feet avalanches are unlikely although isolated pockets of wind slab can be found just below that elevation in areas particularly prone to wind loading. Avalanches are unlikely at low elevations the snowpack is very shallow and stable.
