24-25

Wet loose avalanches in Sheep Creek

Sheep Creek
Cooke City
Code
WL-N-R1-D1
Aspect
S
Latitude
45.03440
Longitude
-109.98400
Notes

We spotted several loose wet avalanches that occurred yesterday in steep, rocky terrain up Sheep Creek.

Number caught
0
Number buried
0
Avalanche Type
Wet loose-snow avalanche
Trigger
Natural trigger
R size
1
D size
1
Problem Type
Wet Snow
Snow Observation Source
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Multiple Avalanches
Advisory Year

Wind Deposition and Scour on Buck Ridge

Date
Activity
Snowmobiling

Saw this cool illustration of wind deposition, scouring and unaffected snow on a ridge line near the top of Bear Creek at the far end of Buck Ridge.  The lighting really helped too.  Ridge top is scoured and piled onto the lee slope and there is a very clear line between hard wind slab and relatively unaffected snow where the old snowmobile tracks are.  

We also spotted a small, snowmobile triggered avalanche on a steep, east facing slope in Muddy Creek.  

Region
Northern Madison
Location (from list)
Buck Ridge
Observer Name
USFS Snow Rangers

Weakening Snow and Future Problems

Date
Activity
Skiing

Today, we toured south of Cooke City, up Republic Creek and Republic Mountain. We spotted widespread, weakening snow surfaces: surface hoar feathers at lower elevations, faceted snow on cold, shady slopes up high, and faceted snow beneath crusts on solar aspects. Our pit on an E aspect at 9460' did not produce unstable test results, but showed the top 1.5' of snow to have faceted and weakened during this bout of high pressure. These layers are not concerning now, but will certainly be top of mind when the next storm system arrives over the weekend. 

We spotted several loose wet avalanches that occurred yesterday in steep, rocky terrain up Sheep Creek. We also noted an old, deep persistent slab avalanche on a NW' aspect near the south end of the Republic Creek drainage. This likely broke around a week ago. 

Skies were clear, winds were calm, and temperatures were warm in the sun and chilly everywhere else. 

Region
Cooke City
Location (from list)
Republic Mountain
Observer Name
H. Darby

Taylor Fork - surface hoar

Date
Activity
Snowmobiling
Region
Northern Madison
Location (from list)
Skyline Ridge
Observer Name
Matt R

GNFAC Avalanche Forecast for Thu Jan 30, 2025

Snowpack and Avalanche Discussion

<p><span><span><span><strong><span><span>Wet loose avalanches</span></span></strong></span></span></span><span><span><span><span><span><span>: Watch out for point releases of wet snow on the surface of the snowpack as things heat up on sunny slopes, especially on slopes with exposed rocks. There was a good refreeze last night, and sunny slopes have been through a few melt freeze cycles which will limit this avalanche activity today..</span></span></span></span></span></span></p>

<p><span><span><span><strong><span><span>Old wind slabs:</span></span></strong></span></span></span><span><span><span><span><span><span> Isolated locations may have a few old wind slabs resting on facets that formed during cold weather over MLK weekend. Time and warm temperatures have helped many of these wind slabs stabilize, but I’d consider this problem if getting into extreme terrain where a very small slide can have severe consequences (like riding above cliffs).&nbsp;</span></span></span></span></span></span></p>

<p><span><span><span><span><span><span>We’re keeping tabs on the snow surface as we prepare to move into a prolonged stormy period. </span></span></span></span></span></span><a href="https://youtu.be/SqfcVtQ4uxY?feature=shared"><span><span><span><span><s… explains it well in this video</span></span></u></span></span></span></span></span></a><span><span><span><span><span><span>. Typically the snow surface weakens and facets during clear cold nights and warm sunny days, but especially warm weather has helped limit this process.&nbsp;&nbsp;</span></span></span></span></span></span></p>

<p><span><span><span><span><span><span>Today avalanche conditions are generally safe and the avalanche danger is LOW.</span></span></span></span></span></span></p>

<p><em><span><span><span><strong><span><span>HEADS UP</span></span></strong></span></span></span></em><span><span><span><span><span><span> - It has generally been open season with people riding many steep slopes under stable conditions. Moving into a prolonged snowy/windy period, consider changing your mindset to “</span></span></span></span></span></span><a href="https://avalanche.org/avalanche-encyclopedia/human/decision-making/stra… Back</span></span></u></span></span></span></span></span></a><span><span><span><span><span><span>” for the short term. A small weather change requires a small step back. A big weather change requires a big step back.</span></span></span></span></span></span></p>

KING AND QUEEN OF THE RIDGE

Join us for the King & Queen of the Ridge this Saturday at Bridger Bowl! Hike, ride and help us raise money. It’s a blast! Fundraising prizes for the top 5 individuals who raise over $500. No racing is necessary to compete for the fundraising prizes.