22-23

Wind loading near fairy lake

Date
Activity
Skiing

Around 2ft down in the pit that was dug there is a generally stable storm slab but it still broke after 5 elbow strikes. Finger tip strikes did trigger a 3-4 in wind slab in the pit and a remotely triggered wind slab was observed halfway up the whiteworm. 40 wide and 5 in deep it ran for about 60 yd.

Region
Bridger Range
Location (from list)
Fairy Lake
Observer Name
Colin Howell

Poor test scores on east face of middle basin @9400 ft

Date
Activity
Skiing

We were at the ridge of middle basin @9400 feet. Before skiing we dug a pit and weren’t thrilled with the results. CT broke on the barrier between the fresh snow and the first dump that the area had. We got an ECTP 17 that went all the way across at the same old snow- new snow barrier @ 35- 40 cm from the ground. Stuck to the lower angle terrain and had a great day.

Region
Northern Madison
Location (from list)
Middle Basin
Observer Name
Derek Mitlehner

Remote triggered wind slab N. Bridgers

Fairy Lake
Bridger Range
Code
ASr-R2-D1-I
Elevation
8700
Aspect
E
Latitude
45.90430
Longitude
-110.95800
Notes

From IG: "Remotely skier trigger wind slab up on white worm near sac bowl".

Number of slides
1
Number caught
0
Number buried
0
Trigger
Skier
Trigger Modifier
r-A remote avalanche released by the indicated trigger
R size
2
D size
1
Bed Surface
I - Interface between new and old snow
Problem Type
Wind-Drifted Snow
Slab Thickness
6.0 inches
Vertical Fall
100ft
Slab Width
50.00ft
Slab Thickness units
inches
Single / Multiple / Red Flag
Single Avalanche
Advisory Year

GNFAC Avalanche Forecast for Thu Nov 10, 2022

Snowpack and Avalanche Discussion

<p><span><span><span><span><span><span>The snow is starting to pile up and triggering an avalanche is very much a possibility today and through the weekend. Storm totals since Monday are around two feet near West Yellowstone and Cooke City, and around a foot near Bozeman and Big Sky. Strong winds from both the east and west have blown this new snow into deep, cohesive drifts that could avalanche today. Look for and avoid these wind drifts, as they are where you’re most likely to trigger a slide.</span></span></span></span></span></span></p>

<p><span><span><span><span><span><span>Yesterday, a skier triggered an avalanche near the summit of Mt Blackmore that broke 50 ft below him (</span></span></span></span></span></span><a href="https://www.mtavalanche.com/images/22/crown-avalanche-remotely-triggere… href="https://www.mtavalanche.com/images/22/crown-and-runout-skier-triggered-…; photo</span></span></u></span></strong></span></span></span></a><span><span><span><span><span><span>). It broke 10-18” deep, 150 ft wide and ran 600 vertical ft over cliffs. Thankfully no one was caught. Skiers at Bridger Bowl also got a small pocket to propagate in the new snow around 6” deep (</span></span></span></span></span></span><a href="https://www.mtavalanche.com/node/26743"><span><span><span><strong><span…;).&nbsp;</span></span></span></span></span></span></p>

<p><span><span><span><span><span><span>Take note - avalanche season is here. Travel is becoming easier with 2-4 ft of snow on the ground in many areas. This also means that avalanches can break deeper and wider. Travel in the backcountry like you would any day mid-winter or avoid steep slopes entirely. Avalanche rescue gear (beacon, shovel, and probe) and a partner are essential if you’re going into avalanche terrain.&nbsp;</span></span></span></span></span></span></p>

<p><span><span><span><span><span><span>Your observations are more important than ever this time of year as we get to know this season’s snowpack.&nbsp;</span></span></span></span></span></span></p>

<ul>
<li><a href="https://www.mtavalanche.com/node/add/snow_obs"><span><span><span><stron… your Observations</span></span></u></span></strong></span></span></span></a></li>
<li><a href="https://www.mtavalanche.com/snow-observations-list"><span><span><span><… the Observations</span></span></u></span></strong></span></span></span></a></li>
</ul>

<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><stron…;, email (</span></span></span></span></span></span><a href="mailto:mtavalanche@gmail.com"><span><span><span><strong><span><u><span>…;), phone (406-587-6984), or Instagram (#gnfacobs). </span></span></span></span></span></span></p>

<p>In the mountains near Island Park, snow is starting to pile up and triggering an avalanche is very much a possibility today and through the weekend. Strong winds have blown the new snow into deep, cohesive drifts that could avalanche. Take note - avalanche season is here. Travel in the backcountry like you would any day mid-winter or avoid steep slopes entirely.</p>

Upcoming Avalanche Education and Events

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

A skier remotely triggered an avalanche on Mt Blackmore (11/9/22).

From email: "I ski cut the top of the face and remote triggered a hard slab from 50’ above the crown. It broke full width of the couloir feature, 150’ wide and 10-18” deep. Broke on new snow/old snow interface which was another hard wind slab. The avalanche ran the length of the East face and stopped just below the last set of cliffs."

 

Northern Gallatin, 2022-11-10

A skier remotely triggered an avalanche on Mt Blackmore (11/9/22).

From email: "I ski cut the top of the face and remote triggered a hard slab from 50’ above the crown. It broke full width of the couloir feature, 150’ wide and 10-18” deep. Broke on new snow/old snow interface which was another hard wind slab. The avalanche ran the length of the East face and stopped just below the last set of cliffs."

 

Northern Gallatin, 2022-11-10