23-24

On the morning of 3/14/24, a skier remotely triggered the Lawn Mower and an adjacent path on "Town Hill" in the Absaroka Range (outside of the GNFAC advisory area) while ascending on the other side of the ridgeline from the paths. The slide ran at least 1000 ft vertical, up to a 1/2 mile wide, and 2-4' deep. Photo: Anonymous 

 

Out of Advisory Area, 2024-03-14

Remotely triggered Lawn Mower

Date
Activity
Skiing

On the morning on 3/14/24, a skier remotely triggered the Lawn Mower and an adjacent path on "Town Hill" in the Absaroka Range (outside of the GNFAC advisory area) while ascending on the other side of the ridgeline from the paths. The slide ran at least 1000 ft vertical.

From IG: "1/4 to 1/2 mile wide crown. Lawnmower and adjacent gully. 2-4 ft deep. Remote trigger from ~200 ft away. Crown is 8800 ft N/NW"

Region
Out of Advisory Area
Location (from list)
Lawn Mower - Town Hill

Limited surface instability in the Bridgers

Date
Activity
Skiing

Skied up around Frazier Basin today, found limited instability in the new snow beyond sluffing. Wind loading was minimal with no large drifts, and no cracking in the new snow.  Underneath the new snow was a very supportive crust on all aspects. Did not see any new avalanche activity, but we did see numerous large old slides. Did see a good amount warming on solar aspects until the clouds moved in around noon or 11. 
 

Region
Bridger Range
Location (from list)
Frazier Basin
Observer Name
Jay Alford

GNFAC Avalanche Forecast for Thu Mar 14, 2024

Snowpack and Avalanche Discussion

<p><span><span><span><span><span><span>Recent snowfall, even a few inches, will keep many slopes on the edge of avalanching. This winter is unusual and instability lingers days after seemingly minor snow falls. Sunshine habitually and falsely, makes us feel safer, smarter, and bolder. We are 3-6 days out from massive, destructive avalanches in Cooke City, the northern Gallatin and northern Madison Ranges. Some were triggered by people, some from cornices breaking, and others were hair-raising naturals. The weak snow that formed near the ground in Nov-Jan is our bane.&nbsp;</span></span></span></span></span></span></p>

<p><span><span><span><span><span><span>Our latest 4 field videos chronicle </span></span></span></span></span></span><a href="https://www.youtube.com/watch?v=5Mlxcbf3jrI"><span><span><span><strong>… Park</span></span></u></span></strong></span></span></span></a><span><span><span><span><span><span>, </span></span></span></span></span></span><a href="https://www.youtube.com/watch?v=ZaqRmvvNp9c"><span><span><span><strong>… Basin</span></span></u></span></strong></span></span></span></a><span><span><span><span><span><span> and Cooke City (</span></span></span></span></span></span><a href="https://youtu.be/7F4hYSm-iEY"><span><span><span><strong><span><u><span>… 1</span></span></u></span></strong></span></span></span></a><span><span><span><span><span><span>, </span></span></span></span></span></span><a href="https://youtube.com/shorts/BJGckpdQQpQ"><span><span><span><strong><span… 2</span></span></u></span></strong></span></span></span></a><span><span><span><span><span><span>). Mother Nature’s greatest-hits include an avalanche on Mt. Blackmore (</span></span></span></span></span></span><a href="https://www.mtavalanche.com/node/31432"><span><span><span><strong><span…;)</span></span></u></span></span></span></span></span></a><span><span><span><span><span><span>, Beehive Basin (</span></span></span></span></span></span><a href="https://youtu.be/ZaqRmvvNp9c"><span><span><span><strong><span><u><span>…;, and </span></span></span></span></span></span><a href="https://www.mtavalanche.com/node/31343"><span><span><span><strong><span…;), and huge avalanches on many peaks around Cooke City (</span></span></span></span></span></span><a href="https://www.mtavalanche.com/snow-observations-list?field_regions_simila… God!</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>Today is the first day of many without snowfall. Although time is our friend and helps stabilize the snowpack, we need to be patient. Dangerous avalanche conditions permeate the mountains. Watch your slope angles and only nibble low-angled avalanche terrain if you can’t help yourself (</span></span></span></span></span></span><a href="https://www.youtube.com/watch?v=Dn0nFLZlPE8"><span><span><span><strong>… mgt video</span></span></u></span></strong></span></span></span></a><span><span><span><span><span><span>). Avalanches are running deep, wide, destructive and are unsurvivable.&nbsp;</span></span></span></span></span></span></p>

<p><span><span><span><span><span><span>The avalanche danger is rated CONSIDERABLE.</span></span></span></span></span></span></p>

<p><span><span><span><span><span><span>In the Bridger Range the snowpack is weak and not fully trusted. Wind loading, most notably winds that blow </span></span></span></span></span></span><span><span><span><span><em><span>downhill</span></em><span><span>, have loaded many slopes at mid-elevation. This occurred again yesterday, which means some slopes could be wind drifted and prime to avalanche. Looking to the past helps inform us about the future, and the slides on Ross Peak (</span></span></span></span></span></span><a href="http://www.mtavalanche.com/node/31435"><span><span><span><strong><span>…;), Saddle Peak (</span></span></span></span></span></span><a href="https://www.mtavalanche.com/node/31330"><span><span><span><strong><span… and photos</span></span></u></span></strong></span></span></span></a><span><span><span><span><span><span>) and Naya Nuki (</span></span></span></span></span></span><a href="https://www.mtavalanche.com/node/31418"><span><span><span><strong><span…;) illustrate today’s danger.&nbsp;</span></span></span></span></span></span></p>

<p><span><span><span><span><span><span>Small avalanches can be just as deadly as a large one, especially if it pushes us into an unforgiving terrain trap (trees, cliffs, gullies). Be on the lookout for signs of instability (whumpfs, cracking in wind drifts) and always ask yourself, “What if I’m wrong and this slides?”&nbsp;</span></span></span></span></span></span></p>

<p><span><span><span><span><span><span>I recommend sticking to low-consequence terrain because this snowpack has a well documented history of fooling us. Human-triggered avalanches are possible, and the avalanche danger is rated MODERATE.</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.

Natural Avalanches in Swan Creek

Swan Creek
Northern Gallatin
Code
HS-N-R2-D2-O
Aspect
N
Latitude
45.37610
Longitude
-111.09400
Notes

Observed sometime between 03/06/2024-03/13/2024: 

"Just finished a weeklong ski from west Yellowstone to bear canyon, and thought I’d chime in that I didn’t observe anything that hasn’t been reported on already. I saw lots of deep slabs breaking near the ground, primarily on the north half of the compass. But sometimes not!.... It was interesting to see that despite the lack of snow, some avalanches were running almost full track. It seems like after a week of being on the snow I would see some sort of pattern, but I feel like I ended the trip with the same amount of confidence I entered it with, and didn’t feel comfortable exposing myself to hardly anything. 
I attached a couple photos of a slide I saw toward the head end of Swam Creek. The crown was 2-5’ deep and ~2000’ wide, and it stopped within 50’ of old growth timber. "

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Hard slab avalanche
Trigger
Natural trigger
R size
2
D size
2
Bed Surface
O - Old snow
Problem Type
Persistent Weak Layer
Snow Observation Source
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year

Skiers a few days ago saw several deep natural avalanches near the head of Swan Creek. These avalanches broke 2-5' deep, 2000' wide, and ran "full track". The exact date of when these avalanches happened is unknown but they likely happened over a week ago in the first few days of March. Photo: S. Reinsel

Northern Gallatin, 2024-03-13

Skiers a few days ago saw several deep natural avalanches near the head of Swan Creek. These avalanches broke 2-5' deep, 2000' wide, and ran "full track". The exact date of when these avalanches happened is unknown but they likely happened over a week ago in the first few days of March. Photo: S. Reinsel

 

 

Northern Gallatin, 2024-03-13

Deep slabbies

Date
Activity
Skiing

Just finished a weeklong ski from west Yellowstone to bear canyon, and thought I’d chime in that I didn’t observe anything that hasn’t been reported on already. I saw lots of deep slabs breaking near the ground, primarily on the north half of the compass. But sometimes not! There did not seem to be much activity in the newer snow, which was encouraging. In 110 miles of skiing I got a grand total of two collapses, which is close to an inverse ratio of what I experienced Nordic skiing near west Yellowstone earlier this year. It was interesting to see that despite the lack of snow, some avalanches were running almost full track. It seems like after a week of being on the snow I would see some sort of pattern, but I feel like I ended the trip with the same amount of confidence I entered it with, and didn’t feel comfortable exposing myself to hardly anything. 
 

I attached a couple photos of a slide I saw toward the head end of Swam Creek. The crown was 2-5’ deep and ~2000’ wide, and it stopped within 50’ of old growth timber. 

Observer Name
Sam Reinsel

A bit of new snow at battle ridge

Date
Activity
Snowmobiling

Rode Battle Ridge to Fairy Lake Road via lower connector, then back to Battle Ridge area via upper connector. From there we took a thorough lap around the Ross Peak zone and north to the east-west boundary south of Throne, stopping to peer into the basin closed to snowmobiles south of the Throne. We observed 2 inches in the Battle ridge parking lot when we arrived and 4-5" up high. Wind was dead calm, Temperatures were hovering at freezing to above freezing. Between ross peak and throne we observed what appeared to be a wet snow avalanche from last weeks warm temperatures at 45.875941, -110.952699. We also saw no other area users which was nice. It was grauppelling while we returned to the truck.

Region
Bridger Range
Location (from list)
Battle Ridge
Observer Name
Alexander Jett