The Bridger-Teton Avalanche Center in Jackson has issued a BACKCOUNTRY AVALANCHE WARNING which is in effect until 10 PM MST Friday... * WHAT...Avalanche danger remains very dangerous in the backcountry due to an unusually weak snowpack. * WHERE...The mountains of western Wyoming, including the Snake River, Salt River, Wyoming, Gros Ventre, Teton, and Togwotee Ranges. * WHEN...Until 10 PM MST Friday, January 19. * IMPACTS...Human-triggered avalanches large enough to bury people are very likely to occur on most aspects and elevations in the backcountry. Avoid traveling on or below slopes steeper than 30 degrees. * PRECAUTIONARY / PREPAREDNESS ACTIONS...Travel in avalanche terrain is not recommended. Avalanches may be triggered remotely—from flat terrain above, below, and to the sides of steep slopes. Avalanches may involve deeper weak layers of snow and produce a larger avalanche than expected. Avalanches could run onto low angle terrain, hitting paths, roads or groomed snowmobile trails. Consult http://bridgertetonavalanchecenter.org/ or www.avalanche.org for more detailed information. Similar avalanche danger may exist at locations outside the coverage area of this or any avalanche center.