24-25

Dust on Crust in Hyalite

Date
Activity
Snowboarding

Got up early and cruised around on some different aspects on Mt Blackmore. Got some shooting cracks on the N side of the mountain mid slope, textured snow and snow drifts were widespread in the basin on N aspects.  Found great skiing in N facing trees on that side of the mountain lower down below the apron and such.

East face had some top loading, nothing I was concerned about below ridge lines, save for some fast sluffs!

Found some isolated pockets of surface hoar, nothing widespread.

All in all, a fun morning, be curious to see how this next one affects the stability picture. 

 

Region
Northern Gallatin
Location (from list)
Mt Blackmore
Observer Name
George Faegre

GNFAC Avalanche Forecast for Wed Mar 5, 2025

Snowpack and Avalanche Discussion

<p><span><span><span><span><span><span>In popular areas, few slopes have been untouched by tracks and it’s been about a week since significant snowfall.&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> remain the primary problem, but the odds of triggering one on most slopes is low; however, there are likely a few slopes lurking out there where you could trigger one of these slides 2-3 feet deep. Be most suspicious of slopes at mid elevations, in the trees. Check out photos from a slide in </span></span></span></span></span></span><a href="https://www.mtavalanche.com/node/34421"><span><span><span><span><span><… on Friday</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/34413"><span><span><span><span><span><… Creek on Thursday</span></span></u></span></span></span></span></span></a><span><span><span><span><span><span>, and </span></span></span></span></span></span><a href="https://www.mtavalanche.com/node/34368"><span><span><span><span><span><… Monday in Cooke</span></span></u></span></span></span></span></span></a><span><span><span><span><span><span> to get a sense of the type of terrain harboring the weak layer of facets responsible for these slides. This weak layer seems more pronounced in the southern Madison and Gallatin ranges and the Lionhead area.</span></span></span></span></span></span></p>

<p><span><span><span><span><span><span>At this point, this avalanche problem is isolated, and most slopes have generally safe avalanche conditions making the avalanche danger LOW. This doesn’t mean no danger. Isolated slopes can still produce avalanches, and I’d avoid steep terrain that runs into a terrain trap like trees, rocks, or a gully.</span></span></span></span></span></span></p>

<p><span><span><span><span><span><span>Shallow wind slabs - Increased winds from the west (especially in Hyalite Canyon) at upper elevations have formed wind slabs maybe 6-8 inches deep just under ridgelines. The threat of this problem will be determined by the terrain you choose today. These wind slabs will be most dangerous in extreme terrain where simply falling downhill can have severe consequences. With no new snow yesterday near Island Park, this problem is almost non-existent.&nbsp;</span></span></span></span></span></span></p>

<p><span><span><span><span><span><span>Today, avalanches are unlikely on the vast majority of terrain and the avalanche danger is LOW. Watch out for and avoid pockets harboring shallow wind slabs especially in more extreme terrain.</span></span></span></span></span></span></p>

Upcoming Avalanche Education and Events

Avalanche awareness focused on springtime avalanche conditions: Thursday, March 13 at the Bozeman REI from 6-7:30 p.m.

Sluffing in new snow

Date
Activity
Skiing

Took a quite tour up The Ramp to see how the new snow is bonding. Found 3-5" of new snow. Non-cohesive and seemed well bonded to the surfaces beneath. No signs of wind effect. No slab avalanches or signs of instability noted.

Saw a few sluffs in the new snow triggered by skiers in the very steep terrain just north of the Bridger Bowl ski area boundary (see photo). These sluffs were small, definitely not large enough to bury someone.

Region
Bridger Range
Location (from list)
The Ramp
Observer Name
Hoyer

PWL Avalanche in Muddy Creek

Buck Ridge
Northern Madison
Code
SS-R3-D2-O
Elevation
8700
Aspect
E
Latitude
45.17190
Longitude
-111.38000
Notes

In nearly 45 miles of riding, we noted two avalanches. Both breaking on persistent weak layers a few feet down in the snowpack. The first was a small north-facing pocket in the First Yellow Mule (R1-D1) that was snowmobile triggered. It looked to be around a week old. The second was a larger avalanche (R3-D2), east-facing, deep in Muddy Creek. This was drifted in and likely broke around 2.5 weeks ago during the last significant storm cycle. 

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
R size
3
D size
2
Bed Surface
O - Old snow
Problem Type
Persistent Weak Layer
Vertical Fall
400ft
Slab Width
500.00ft
Snow Observation Source
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year

Small PWL Avalanche in First Yellow Mule

Buck Ridge
Northern Madison
Code
SS-AMu-R1-D1-O
Elevation
9000
Aspect
N
Latitude
45.17190
Longitude
-111.38000
Notes

In nearly 45 miles of riding, we noted two avalanches. Both breaking on persistent weak layers a few feet down in the snowpack. The first was a small north-facing pocket in the First Yellow Mule (R1-D1) that was snowmobile triggered. It looked to be around a week old. The second was a larger avalanche (R3-D2), east-facing, deep in Muddy Creek. This was drifted in and likely broke around 2.5 weeks ago during the last significant storm cycle.

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Snowmobile
Trigger Modifier
u-An unintentional release
R size
1
D size
1
Bed Surface
O - Old snow
Problem Type
Persistent Weak Layer
Slab Thickness
18.0 inches
Vertical Fall
20ft
Slab Width
20.00ft
Snow Observation Source
Slab Thickness units
inches
Single / Multiple / Red Flag
Single Avalanche
Advisory Year