24-25

We rode into the Taylor Fork on Feb 13, down into the bottom of Sunlight Basin, across Carrot Basin and to the Wilderness Boundary. We saw four persistent slab avalanches that likely broke last weekend or at the beginning of the week. All appeared to be snowmobiler-triggered R1-2, D1.5-2 avalanches at broke of the January layer of near-surface facets and surface hoar. Additionally, we saw one wind slab avalanche (R1, D1) in Sunlight Basin. This slide was fresh from this morning or yesterday. Photo: GNFAC

Southern Madison, 2025-02-14

We rode into the Taylor Fork on Feb 13, We saw four persistent slab avalanches that likely broke last weekend or at the beginning of the week. All appeared to be snowmobiler-triggered R1-2, D1.5-2 avalanches at broke of the January layer of near-surface facets and surface hoar. Photo: GNFAC

Southern Madison, 2025-02-14

We rode into the Taylor Fork on Feb 13, We saw four persistent slab avalanches that likely broke last weekend or at the beginning of the week. All appeared to be snowmobiler-triggered R1-2, D1.5-2 avalanches at broke of the January layer of near-surface facets and surface hoar. Photo: GNFAC

Southern Madison, 2025-02-14

Wind Effected Snow in Northern Bridgers

Date
Activity
Skiing

We snowmobiled and skiied around the northern bridgers yesterday. Found lots of wind effect. Most faces had been wind scoured, some protected south facing slopes were wind loaded. Noted a few small natural slides, one other group reported to us that they popped a wind slab on a south facing slope. We bailed on our bigger objectives and found some decent snow in a sheltered south facing chute, we did not experience any instability on this but I'm sure on other slopes we would have seen wind slabs. A thicker wind crust was developing in most areas. Snow pack seemed really solid and deep, except near cliffs and hidden rock piles, were we found facets to the ground.

Region
Bridger Range
Location (from list)
Fairy Lake

Wind slab in south cottonwood

Date

Toured up around Blackmore and s cottonwood. Found an extremely reactive windslab in the afternoon. It was thin, but easily triggered and would propagate about the width of each terrain feature (20-50ft). Each slab ran the length of the slope (150-200 ft). 

Observer Name
Jay Alford

GNFAC Avalanche Forecast for Fri Feb 14, 2025

Snowpack and Avalanche Discussion

<p><span><span><span><strong><span><span>Wind slab avalanches </span></span></strong></span></span></span><span><span><span><span><span><span>are the primary concern today. There are a couple inches of new snow already, with a few more on the way today and winds strong enough to drift that new snow. Thin fresh drifts will be easily triggered today. Triggering older, somewhat thicker wind slabs that formed with high winds over the last couple days is also a possibility.&nbsp;</span></span></span></span></span></span></p>

<p><span><span><span><strong><span><span>Persistent Slab avalanches </span></span></strong></span></span></span><span><span><span><span><span><span>are still possible, breaking a couple feet deep on weak layers that formed at the end of January, as evidenced by a small slide triggered yesterday in the Lionhead area (</span></span></span></span></span></span><a href="https://www.mtavalanche.com/node/34156"><span><span><span><span><span><…;), an avalanche near Cooke City triggered by a cornice within the last 36 hours that looks have broken on deeper weak layers (</span></span></span></span></span></span><a href="https://www.mtavalanche.com/images/25/cornice-triggered-avalanche-miner…;) and a couple slides in the Taylor Fork that likely broke last weekend (</span></span></span></span></span></span><a href="https://www.youtube.com/watch?v=wZ3k35z5Ej8&amp;embeds_referring_euri=h… Fork video</span></span></u></span></span></span></span></span></a><span><span><span><span><span><span>). These slides are more likely to be triggered on windloaded slopes, with thicker and more cohesive slabs.&nbsp;</span></span></span></span></span></span></p>

<p><span><span><span><span><span><span>Identifying and avoiding windloaded slopes is the best strategy to reduce your chances of triggering any sort of avalanche today.&nbsp;</span></span></span></span></span></span></p>

<p><span><span><span><span><span><span>The avalanche danger is MODERATE.</span></span></span></span></span></span></p>

<p><span><span><span><strong><span><span>Wind slab avalanches</span></span></strong></span></span></span><span><span><span><span><span><span> are also the primary avalanche problem around Bozeman and Big Sky. It hasn’t snowed much yet and not too much will pile up today, but even without new snow yesterday, we got reports of active wind loading and several small slides (</span></span></span></span></span></span><a href="https://www.mtavalanche.com/node/34144"><span><span><span><span><span><… fork of Hyalite observation</span></span></u></span></span></span></span></span></a><span><span><span><span><span><span>, </span></span></span></span></span></span><a href="https://www.mtavalanche.com/node/34137"><span><span><span><span><span><…. Blackmore observation</span></span></u></span></span></span></span></span></a><span><span><span><span><span><span>).&nbsp;</span></span></span></span></span></span></p>

<p><span><span><span><span><span><span>Identifying areas of wind deposited snow and either avoiding them or assessing how well they’ve bonded is the primary risk management recommendation today. Persistent weak layers are less widespread in these areas compared with further south, but keeping your eye out for them (by digging a snowpit) is still not a bad idea&nbsp;</span></span></span></span></span></span></p>

<p><span><span><span><span><span><span>The avalanche danger is MODERATE today on wind loaded slopes and LOW on non-wind loaded slopes.</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

Small slide in Lionhead

Lionhead Ridge
Lionhead Range
Code
AMu-R1-D1
Latitude
44.71450
Longitude
-111.31800
Notes

From FB message: "Small slide in lower elevation back by lionshead"

Number of slides
1
Number caught
0
Number buried
0
Trigger
Snowmobile
Trigger Modifier
u-An unintentional release
R size
1
D size
1
Snow Observation Source
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year