24-25

Cracking and Small Wind Slabs North of Cooke City

Date
Activity
Skiing

Skied north of Cooke City. Lots of cracking and small slabs on pillows. Observed one small wind slab on NW facing slope 9200 ft.

Region
Cooke City
Location (from list)
COOKE CITY
Observer Name
Beartooth Powder Guides

Wind Slab Avalanche near Buck Weather Station

Buck Ridge
Northern Madison
Code
SS-AMc-R1-D1
Latitude
45.16280
Longitude
-111.35100
Notes

Human triggered release of cornice overhang near the weather station on Buck Ridge. Recent activity next to the small release. Crown 1-2’ deep, 40’ run, 75’ across running over the tracks riding underneath in the recent wind transported slab.

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Snowmobile
Trigger Modifier
c-A controlled or intentional release by the indicated trigger
R size
1
D size
1
Slab Thickness
18.0 inches
Vertical Fall
40ft
Slab Width
75.00ft
Slab Thickness units
inches
Single / Multiple / Red Flag
Single Avalanche
Advisory Year

Small Loose Snow Avalanches in South Cottonwood Basin

Mt Blackmore
Northern Gallatin
Code
SS-NC-R1-D1
Latitude
45.42980
Longitude
-111.00000
Notes

Skied into South Cottonwood basin from Blackmore today. Skiing was sub-par with lots of wind scouring and intense active snow transport. Along with the slides observed yesterday, two recent R1-D1 slides were observed in South Cottonwood Basin: below the Dogleg and on N Twin's west wall via cornice break. No surface hoar, slides from today, or cracking/collapsing were observed. 

Number of slides
2
Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Cornice fall
R size
1
D size
1
Problem Type
Wind-Drifted Snow
Snow Observation Source
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Multiple Avalanches
Advisory Year

Human triggered release of cornice overhang near the weather station on Buck Ridge. Recent activity next to the small release. Crown 1-2’ deep, 40’ run, 75’ across running over the tracks riding underneath in the recent wind transported slab.

Northern Madison, 2025-02-02

GNFAC Avalanche Forecast for Sun Feb 2, 2025

Snowpack and Avalanche Discussion

<p><span><span><span><span><span><span>New snow is being drifted into slabs that are easy for a person to trigger today. On wind-loaded slopes </span></span></span></span></span></span><span><span><span><strong><span><span>wind slab avalanches</span></span></strong></span></span></span><span><span><span><span><span><span> could break 1-3 feet deep. On slopes without fresh drifts, avalanches breaking within or below the new snow are possible and could be large enough to bury a person. Since Friday, snow totals are 8-16” equal to 1.0” of snow water equivalent (SWE), and on many slopes this snow fell on weak, sugary facets or surface hoar which could cause slabs to break easily and propagate wide (</span></span></span></span></span></span><strong><a href="https://www.mtavalanche.com/node/33903"><span><span><span><span><span><…;). Snowfall is expected to be heavy today with continued moderate to strong wind, so expect the danger to rise as the likelihood and size of potential avalanches increases through the day. Human triggered avalanches are likely and the avalanche danger is CONSIDERABLE near Cooke City, West Yellowstone and Island Park.</span></span></span></span></span></span></p>

<p><span><span><span><span><span><span>Near Big Sky, Hyalite and Taylor Fork got 4-9” of snow since Friday and today’s snowfall will start later this afternoon. The recent snow was drifted into stiffer slabs that are possible for people to trigger on steep slopes, and these </span></span></span></span></span></span><span><span><span><strong><span><span>wind slabs</span></span></strong></span></span></span><span><span><span><span><span><span> will grow larger with more snow later today. Fresh wind slabs were reported yesterday on Buck Ridge (</span></span></span></span></span></span><a href="https://www.mtavalanche.com/node/33930"><span><span><span><strong><span…;) and Friday before it started snowing on Mt. Blackmore (</span></span></span></span></span></span><a href="https://www.mtavalanche.com/node/33925"><span><span><span><strong><span…;). Expect slabs to be deeper and wider today.</span></span></span></span></span></span></p>

<p><span><span><span><span><span><span>Weak snow has been reported on the old snow surface across the area (</span></span></span></span></span></span><a href="https://www.mtavalanche.com/node/33900"><span><span><span><strong><span…;, </span></span></strong></span></span></span><a href="https://www.mtavalanche.com/node/33895"><span><span><span><strong><span…;) which could make fresh slabs more unstable. Cracks shooting out from your skis or sled are a sign that fresh drifts are unstable. Avalanches are possible and danger is MODERATE in the Madison and Gallatin Ranges.</span></span></span></span></span></span></p>

<p><span><span><span><span><span><span>An inch or two of new snow in the Bridger Range will not create much hazard and avalanches remain unlikely for today. There might be some isolated thin drifts from recent wind, and some small fresh drifts could form later today when snow starts. Watch out for these wind slabs in terrain where a small slide could have large consequences, such as above cliffs or rocks.&nbsp;</span></span></span></span></span></span></p>

<p><span><span><span><span><span><span>If snow starts earlier, or if there is more wind or more snow falls than expected, watch for and avoid larger fresh drifts and consider the potential for dry loose avalanches on long sustained steep slopes. Avalanche conditions are generally safe and the avalanche danger is LOW.</span></span></span></span></span></span></p>

KING AND QUEEN OF THE RIDGE, Continued

We closed out King and Queen of the Ridge with nearly $30,000 raised! We will post final numbers here after we confirm totals. Thank you to all who participated and raised funds for The Friends of the GNFAC.

Recent and Triggered activity near Buck Weather Station

Date
Activity
Snowmobiling

Human triggered release of cornice overhang near the weather station on Buck Ridge. Recent activity next to the small release. Crown 1-2’ deep, 40’ run, 75’ across running over the tracks riding underneath in the recent wind transported slab.

Region
Northern Madison
Location (from list)
Buck Ridge
Observer Name
T.J.