Bridger Teton Avalanche Center
WESTERN WYOMING AVALANCHE ADVISORY
Issued on Sat January 20, 2018 6:50 PM
Overcast skies brought light, scattered flurries to Western Wyoming for much of the day on Saturday. By the evening, cloud cover began to thin from the northwest to the southeast. Mountain temperatures rose into the mid-teens as the valleys warmed a few degrees into the mid-20s. Northwesterly ridgetop winds ranged from 5 to 15 miles per hour.
Total snowfall since Friday is around six inches in the Tetons and about half of that amount fell on Togwotee Pass. The Southwest Trails area was most favored by this system with total snowfall up to 10 inches. While the likelihood of triggering persistent deep slabs failing on the December drought layer continues to decrease, the consequences remain high with severe injury or death being a likely outcome of getting caught.
FORECAST FOR Sunday, January 21, 2018
The northwest to southeast clearing trend will continue overnight and through most of Sunday before cloud cover begins to increase in the evening as the leading edge of the next disturbance begins to move into the area. A few light, scattered flurries could linger into Sunday, particularly in the Southwest Trails forecast zone. Overnight lows in the mountains will dip into the upper single digits before rising into the low teens in the afternoon. Northwesterly to northerly ridgetop winds will range from 5 to 15 miles per hour.
The general avalanche hazard is expected to remain CONSIDERABLE on Sunday. Conditions will continue to be dangerous as persistent deep slab avalanches remain the primary concern. Large triggers, such as snowmobiles, are more likely to initiate these slabs, but the weight of a single person could still release one of these three to five feet deep slabs if a shallow weak zone is encountered. In the Teton and Southwest Trails forecast zones, backcountry travelers could also trigger recently developed pockets of shallow wind slab in very steep, leeward terrain near upper elevation ridgelines. These small slabs may pose a greater threat in their ability to trigger a persistent deep slab than bury a person. Managing your terrain with a conservative approach will continue to be the safest and easiest way to avoid being caught in a large to very large, destructive avalanche.
TREND FOR Monday, January 22, 2018 AND Tuesday, January 23, 2018
The chance for new snow will increase Sunday night through Monday before beginning to taper off on Tuesday. The likelihood of triggering persistent deep slabs will continue to decrease until the next significant loading event occurs.
For further information call 307-733-2664
To report an avalanche observation call 307-739-2607
SPONSORS: Box Y Ranch, Togwotee Mountain Lodge, Jackson Hole Mountain Resort, Wyoming State Trails Program, Brooks Lake Lodge, Bruce Hayse M.D., Skinny Skis, Chippy's Kitchen and Catering, Jackson Hole Ski Atlas, Grand Targhee Resort, DeFazio Law, Eric Balog, Stewart Johnson, CPA, Grand Teton Floor & Window Coverings, Exum Mountain Guides, International Snowmobile Manufacturers Association, Apex Real Estate and Property Management, RPK3 Law, Snake River Brewing, Redfin, Tip Top Search and Rescue, Next Level Riding Clinics, Exploradus, Deuter - Ortovox, Colorado School of Mines, Stio, Eco Tour Adventures and Steve Romeo Memorial Fund