21-22
Many small avalanches in Tepee Basin
There were many natural avalanches that were breaking on facets near the ground (4-6mm). The 3 feet of snow that fell created unstable conditions and avalanched during the HIGH danger. Most slides were less than 100 feet wide. By GNFAC.
Bare ground on the ridge between Tepee Basin and Bacon Rind Creek. Nearby we found 4 ft deep drifts. 12/22/21. Photo: GNFAC
An avalanche in Tepee Basin appears to have failed within or under the new snow around 12/15/21. Photo taken 12/22/21.
Photo: GNFAC
Forecast link: GNFAC Avalanche Forecast for Fri Dec 24, 2021GNFAC Avalanche Forecast for Sat Dec 25, 2021
An avalanche in Tepee Basin that broke under new snow on facets near the ground. Likely occurred on 12/15/21. Photo taken 12/22/21.
Photo: GNFAC
Forecast link: GNFAC Avalanche Forecast for Thu Dec 23, 2021GNFAC Avalanche Forecast for Sat Dec 25, 2021
Digging a snowpit in 4 feet of drifted snow in Tepee Basin (12/22/21). Photo: GNFAC
Forecast link: GNFAC Avalanche Forecast for Thu Dec 23, 2021
Riders in the Lionhead area observed 5-6 naturally occurring avalanches that likely failed on 12/15 at the tail end of a 3' snowstorm. Photo: S. Tyson
GNFAC Avalanche Forecast for Wed Dec 22, 2021
<p>In the mountains around Cooke City wind blew the previous day's snow (1-2 feet) into drifts. Some of these cracked (<a href="https://mtavalanche.com/images/21/cracking-drift-scotch-bonnet"><strong…;) which showed their potential to avalanche. Today the wind is still blowing yet loading is minimal. On Sunday and Monday, Dave hunted for weak snow and did not find much. He even titled his video “<a href="https://youtu.be/QOBIciPigDY"><strong><u>Good News from Cooke City</u></strong></a>”. His main concern was wind-loaded slopes and a weak(er) layer of sugary, faceted snow near the bottom of the snowpack. Avalanches are still possible as evidenced by a natural avalanche on a wind-loaded slope on Sheep Mountain (<a href="https://www.mtavalanche.com/images/21/natural-avalanche-sheep-mountain"…;) yesterday. These dangers are isolated, but concerning nonetheless. Avoid wind-loaded terrain and be on the hunt for buried weak layers. For today, the avalanche danger is rated MODERATE on all slopes. </p>
<p>The southern Gallatin and southern Madison Ranges along with Lionhead have a suspect snowpack structure (dense snow being held up by weaker, sugary facets). In our stability tests we are finding this interface sometimes breaks. At Lionhead on Monday, it fractured in one of our two pits (<a href="https://youtu.be/7EEn6f8-4fA"><strong><u>video</u></strong></a>). Other red flags of instability include widespread collapsing, or “whumpfs”, from <a href="https://www.mtavalanche.com/node/25215"><strong><u>skiers in Specimen Creek</u></strong></a> in a thin snowpack (less than 2 feet deep), and an avalanche a week ago in <a href="https://mtavalanche.com/images/21/avalanche-bacon-rind-photo-15-dec-202… Rind</u></strong></a>. The potential to trigger slides is not widespread, but areas with weak snow near the ground, or slopes that have a thick load of wind-drifted snow require extra caution. Today, the avalanche danger is rated MODERATE on all slopes.</p>
<p>In the mountains around Bozeman to Big Sky the snowpack is mostly stable, with the exception of wind-drifts. Snowfall since Sunday (less than a foot) was blown into drifts from strong westerly wind. Loading has generally stopped, yet the instability lingers. Ian and his partner rode Buck Ridge and found the snowpack was adequately supporting recent snowfall (<a href="https://youtu.be/cf-qqv2Ssjw"><strong><u>video</u></strong></a>). During times of decreasing avalanche danger it’s easy to be complacent, so I’m recommending you do as we do: always carry rescue gear, dig and assess slopes you plan on hitting, and only travel one-at a time in avalanche terrain (any slope greater than 30 degrees). And if you want to be really pro, carry an inclinometer in your pocket. Today the avalanche danger is rated MODERATE on wind-loaded slopes and LOW on all others. </p>
<p>If you get out, please send us your observations no matter how brief. You can submit them via our <a href="https://www.mtavalanche.com/node/add/snow_observation"><strong><u>websi…;, email (<a href="mailto:mtavalanche@gmail.com"><strong><u>mtavalanche@gmail.com</u></str…;), phone (406-587-6984), or Instagram (#gnfacobs).</p>
Upcoming Education Opportunities:
Get your avalanche brain ready for the season at one of the many classes listed on our education calendar, and list of upcoming events below.
Every Saturday near Cooke City, 10 a.m.-3 p.m. FREE snowpack update and transceiver/rescue training. Stop by for 20 minutes or more at the Round Lake Warming Hut.
Friends of GNFAC Powder Blast Fundraiser