22-23

Shooting crack on Grassy Mtn above Brackett Creek

Date
Activity
Snowshoeing

We were snowshoeing up Grassy Mountain on Feb 15. We were following someone else’s tracks up to a SW facing slope between 35 and 40 degrees at 6400 feet (directly across from Bridger Bowl). We realized the other person had probably turned around because of this crack in the snowpack directly above a gully with terrain traps. We did the same.

Region
Bridger Range
Location (from list)
Brackett Creek

GNFAC Avalanche Forecast for Fri Feb 17, 2023

Snowpack and Avalanche Discussion

<p><span><span><span><span><span><span>It remains possible to trigger avalanches in the snow that fell earlier this week, especially in places where wind has drifted that snow into deeper drifts. The deeper and more recently formed the drift, the more likely you are to trigger a dangerous slide. Winds have been variable and have blown out of unusual directions (including east winds on Wednesday), so be on the lookout for drifts in unusual places. Yesterday, riders north of Cooke City saw a recent snowmobile triggered slide on Crown Butte (</span></span></span></span></span></span><a href="https://www.mtavalanche.com/node/28183"><span><span><span><strong><span…;) and skiers triggered a small slide in a wind drift in Bradley’s meadow, north of Bridger Bowl (</span></span></span></span></span></span><a href="https://www.mtavalanche.com/node/28188"><span><span><span><strong><span…;). Recent human triggered avalanches are the clearest possible evidence that triggering slides remains possible. There were also slides earlier this week on </span></span></span></span></span></span><a href="https://www.mtavalanche.com/node/28158"><span><span><span><strong><span…. Blackmore</span></span></u></span></strong></span></span></span></a><span><span><span><span><span><span>, in </span></span></span></span></span></span><a href="https://www.mtavalanche.com/node/28186"><span><span><span><strong><span… Falls Basin</span></span></u></span></strong></span></span></span></a><span><span><span><span><span><span>, on </span></span></span></span></span></span><a href="https://www.mtavalanche.com/node/28166"><span><span><span><strong><span… Ridge</span></span></u></span></strong></span></span></span></a><span><span><span><span><span><span>,</span></span></span></span></span></span><span><span><span><strong><span><span> </span></span></strong></span></span></span><span><span><span><span><span><span>in </span></span></span></span></span></span><a href="https://www.mtavalanche.com/node/28143"><span><span><span><strong><span…;, and at </span></span></span></span></span></span><a href="https://www.mtavalanche.com/images/23/snowmobiler-triggered-avalanche-l…;

<p><span><span><span><span><span><span>All the avalanche activity we’ve seen following this last storm seems to have broken in the new snow, but there are also weak layers buried in the top 3 feet of the snowpack that we don’t entirely trust just yet. Dig to assess these weak layers before riding steep slopes (</span></span></span></span></span></span><a href="https://www.youtube.com/watch?v=OqjV1Id7_nc"><span><span><span><strong>… Ridge video</span></span></u></span></strong></span></span></span></a><span><span><span><span><span><span>) .</span></span></span></span></span></span></p>

<p><span><span><span><span><span><span>If you decide to enter avalanche terrain, cover your bases by carrying rescue gear (avalanche beacon, shovel and probe) and sticking to safe travel protocols by only exposing one person to steep slopes at a time with a partner watching from a safe spot (</span></span></span></span></span></span><a href="https://www.youtube.com/watch?v=S5dURPSjAX8"><span><span><span><strong>… Rind video</span></span></u></span></strong></span></span></span></a><span><span><span><span><span><span>).</span></span></span></span></span></span></p>

<p><span><span><span><span><span><span>Across the advisory area, the avalanche danger is MODERATE.</span></span></span></span></span></span></p>

<p><span><span><span><span><span><span>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><span><span><span><span><span><span>&nbsp;</span></span></span></span></span></span></p>

<p>&nbsp;</p>

Upcoming Avalanche Education and Events

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

Small skier triggered slide in Bradleys

Bradley Meadow
Bridger Range
Code
AS-R1-D1
Latitude
45.83220
Longitude
-110.92800
Notes

About 34 degree rollover, 14 inch crown.

Number of slides
1
Number caught
0
Number buried
0
Trigger
Skier
R size
1
D size
1
Slab Thickness
14.0 inches
Slab Width
25.00ft
Slab Thickness units
inches
Single / Multiple / Red Flag
Single Avalanche
Advisory Year

Natural avalanche in Twin Falls Basin

Mt. Bole
Northern Gallatin
Code
Latitude
45.41600
Longitude
-110.99800
Notes

Saw debris and what looked like a crown line from a natural avalanche that probably happened a day or two ago in palace butte basin on a NE aspect above Arden lake. My best guess is 150ft wide crown, 1-2ft deep?

Number of slides
1
Number caught
0
Number buried
0
Slab Thickness
18.0 inches
Slab Width
150.00ft
Snow Observation Source
Slab Thickness units
inches
Single / Multiple / Red Flag
Single Avalanche
Advisory Year

Rider triggered avalanche on crown butte. Saw and heard reports of small rider/skier triggered wind slabs North of Cooke City. Photo. Z. Peterson
 

Cooke City, 2023-02-17

Snowmobile triggered slide on Crown Butte

COOKE CITY
Cooke City
Code
SS-AM-R2-D2
Latitude
45.02020
Longitude
-109.93800
Notes

Riders north of Cooke City on 2/16/23 saw an avalanche that appeared to be recently snowmobile triggered on Crown Butte.

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Snowmobile
R size
2
D size
2
Snow Observation Source
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year