22-23

Lick Creek Dense Wind Slabs

Date
Activity
Skiing

At the saddle between the front and backside of Lick Creek we found 110cm of snow with very dense windslabs. These were firm and cohesive, with the firmest being between 100 and 90cm. Our layer of most concern was at 65cm but was difficult to impact and we felt confident our weight alone even in shallow areas would not impact this layer, we skied the front side however due to time constraints. 

Region
Northern Gallatin
Location (from list)
Lick Creek
Observer Name
Ethan Jeannette

Natural on Fox

Date
Region
Cooke City
Location (from list)
Goose Lake
Observer Name
Zach Peterson

Naturals North of Cooke City

Date

Large collapses on primarily solar aspects (S/SE, ~9,500’)

Ectx results on a north facing slope ~9,500’

Region
Cooke City
Location (from list)
Sheep Mountain
Observer Name
Zach Peterson

Natural slide and poor stability on Ernie Miller Ridge

Date
Activity
Skiing

We toured to Ernie Miller today and saw a natural avalanche on a NE slope around 9600 ft. We heard and felt multiple collapses on our way in. We dug a pit on an east facing slope around 9300 ft where we found 105 cm of snow. We got a ECTN 2 result, failing on an interface about 15cm from the surface and ECTP5 failing 40 cm from the surface.

Region
Southern Madison
Location (from list)
Ernie Miller Ridge
Observer Name
Jake Onan

Mt Ellis (main summit)

Date
Activity
Skiing

Experienced no signs of snow instabilities.  Ellis has apparently seen limited amount of wind as only scattered signs of drifting were noted.  SW Montana faceted snow exist at the ground with the snow above in a right side up configuration.  The skiing was excellent, some of the steeper lines were skied and only minor surface sluffes were initiated.

 

Region
Northern Gallatin
Location (from list)
Mt Ellis
Observer Name
Dave Combs

settleing by slush mans

Date
Activity
Skiing

skied over by slush mans lift yesterday.

Got some settling on lower angle above base of lift.

Region
Bridger Range
Location (from list)
Bridger Bowl

Taylor Fork

Date
Activity
Snowmobiling

We observed no natural avalanches or overt signs of instability, although one group in the parking lot mentioned seeing a small slide south in Sage Basin past the Otter Slide. The foot of new snow was wind affected. Human-triggered avalanches in the new snow and wind slabs were possible. These will stabilize in the next few days unless there is continued loading

We dug in Carrot Basin and on the slope up to the weather station. We did not find the weak layers of surface hoar or near-surface faceting like at Lionhead Ridge. I am not convinced it doesn’t exist anywhere, but it does not appear to be widespread. Test results were ECTN 11-15 under the foot of new snow. 

 

Region
Southern Madison
Location (from list)
Taylor Fork
Observer Name
Dave Zinn

Bear basin no propagation

Date
Activity
Skiing

ECTX. In bear basin around 9k feet today dug 4 pits on an E aspect got no propagation. Wind hammering.

Region
Northern Madison
Location (from list)
Bear Basin
Observer Name
Tom Grande

GNFAC Avalanche Forecast for Sat Dec 3, 2022

Snowpack and Avalanche Discussion

<p><span><span><span><span><span><span>The snowpack is still recovering from a big storm and huge loading event. Two feet of snow fell Wednesday through early Friday morning accompanied by very strong winds. Yesterday, riders saw a number of large natural avalanches along Lionhead Ridge (</span></span></span></span></span></span><a href="https://www.mtavalanche.com/node/27021"><span><span><span><strong><span…;). The snowpack has now had 24 hours to begin to accommodate the big load load, so we don’t expect natural slides today and have allowed the avalanche warning to expire. However, because there are persistent weak layers buried beneath the new snow, triggering large avalanches remains </span></span></span></span></span></span><span><span><span><span><em><span>likely</span></em></span></span></span></span><span><span><span><span><span><span> today and it’ll take a bit more time before we can start to actually trust the snowpack (</span></span></span></span></span></span><a href="https://www.youtube.com/watch?v=PVQkjFvFnnw&amp;feature=emb_logo"><span…;). The avalanche danger is CONSIDERABLE.</span></span></span></span></span></span></p>

<p><span><span><span><span><span><span>As skies cleared yesterday, a number of natural avalanches were seen around Cooke City that broke during the storm (</span></span></span></span></span></span><a href="https://www.mtavalanche.com/node/27013"><span><span><span><strong><span… and photos</span></span></u></span></strong></span></span></span></a><span><span><span><span><span><span>). The largest of these slides broke 3-4 ft deep, likely on a weak layer that formed last week prior to the storm (</span></span></span></span></span></span><a href="https://www.youtube.com/watch?v=p4oOrj6x7oU&amp;list=PLXu5151nmAvTi1DBS…’s video from yesterday</span></span></u></span></strong></span></span></span></a><span><span><span><span><span><span>). With the combination of two feet of storm snow, strong winds to build even thicker slabs, and buried weak layers - human triggered avalanches remain likely today. The avalanche danger is CONSIDERABLE.</span></span></span></span></span></span></p>

<p>&nbsp;</p>

<p><span><span><span><span><span><span>Six inches to a foot of snow fell over the past few days, accompanied by strong winds to drift it into thicker slabs. These wind drifts are our biggest concern today (</span></span></span></span></span></span><a href="https://www.youtube.com/watch?v=aqqdf5N85DM&amp;list=PLXu5151nmAvTi1DBS… Fork video</span></span></u></span></strong></span></span></span></a><span><span><span><span><span><span>). There also are some areas where weak layers were buried beneath the new snow (</span></span></span></span></span></span><a href="https://www.mtavalanche.com/node/26995"><span><span><span><strong><span… Rind observation</span></span></u></span></strong></span></span></span></a><span><span><span><span><span><span>). It doesn’t appear that these weak layers are widespread, but we still have limited information to confirm this so our confidence is low. Conveniently, the snowpack is still shallow enough that it’ll only take a few minutes to dig down and check for these weak layers before committing to steep slopes. Human triggered avalanches are possible today and the avalanche danger is rated MODERATE.</span></span></span></span></span></span></p>

<p><span><span><span><span><span><span>If you get out, please share avalanche, snowpack or weather observations via our</span></span></span></span></span></span><a href="https://www.mtavalanche.com/node/add/snow_obs"><span><span><span><span>…; </span></span></span></span></span></span><span><span><span><strong><span><u><span><span>website</span></span></u></span></strong></span></span></span></a><span><span><span><span><span><span>, email (</span></span></span></span></span></span><span><span><span><strong><span><span>mtavalanche@gmail.com</span></span></strong></span></span></span><span><span><span><span><span><span>), phone (406-587-6984), or Instagram (#gnfacobs).</span></span></span></span></span></span></p>

Upcoming Avalanche Education and Events

Our education calendar is full of awareness lectures and field courses. Check it out: Events and Education Calendar.