24-25

Sunset Peak natural - Cooke City

Wolverine Peak
Cooke City
Code
HS-N-R2-D2.5-O
Elevation
9800
Aspect
NE
Latitude
45.04690
Longitude
-110.00100
Notes

Rode out to Wolverine Pass on New Years Eve.  Daisy pass is a little spicy for novices still. On approach to  wolverine pass/YNP boundary we found HS 160cm on NE facing slope at 9200'.  Found 3-4mm SH in tact at 110 cm deep. Found 1-2mm FC at 60cm deep. Ectn27 at storm interface layer 60 cm deep. No results on SH layer, but many collapses during the day assumed to be on this layer.  Large D2-3 deep Slab avalanche seen on NW facing slope of Sunset Peak. Picture attached. Generally stable condions, but big avalanches on N,NE,NW facing slopes are a real concern for sure. 

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Hard slab avalanche
Trigger
Natural trigger
R size
2
D size
2.5
Bed Surface
O - Old snow
Problem Type
Persistent Slab
Snow Observation Source
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year

Rode out to Wolverine Pass on New Years Eve.  Daisy pass is a little spicy for novices still. On approach to  wolverine pass/YNP boundary we found HS 160cm on NE facing slope at 9200'.  Found 3-4mm SH in tact at 110 cm deep. Found 1-2mm FC at 60cm deep. Ectn27 at storm interface layer 60 cm deep. No results on SH layer, but many collapses during the day assumed to be on this layer.  Large D2-3 deep Slab avalanche seen on NW facing slope of Sunset Peak. Picture attached. Generally stable condions, but big avalanches on N,NE,NW facing slopes are a real concern for sure. 

Cooke City, 2025-01-02

Wolverine Pass - Cooke City

Date
Activity
Skiing

Rode out to Wolverine Pass on New Years Eve. On approach to  wolverine pass/YNP boundary we found HS 160cm on NE facing slope at 9200'.  Found 3-4mm SH in tact at 110 cm deep. Found 1-2mm FC at 60cm deep. Ectn27 at storm interface layer 60 cm deep. No results on SH layer, but many collapses during the day assumed to be on this layer.  Large D2-3 deep Slab avalanche seen on NW facing slope of Sunset Peak. Picture attached. Generally stable conditions, but big avalanches on N,NE,NW facing slopes are a real concern for sure. 

Region
Cooke City
Location (from list)
Wolverine Peak
Observer Name
BPG - Zavora

Fairy Lakes

Date
Activity
Skiing

This is from yesterday (202-01-01):

Low visibility, but we saw a few size 1 Dry Loose avalanches out of unskiable cliffy terrain.

Got one whumpf in a small willowy meadow near Ainger Lake. This occurred when one person took his skis off and sunk nearly to the ground. The rest of the group had already transitioned and stomped around in this spot without any reactivity.

In exposed lee terrain there was an unreactive windslab form the previous day (2024-12-31) buried by 5-10cm of new snow when we arrived. It snowed S-1 to S2 all day, winds were moderate gusting strong on ridges, but calm or light elsewhere.

Good powder skiing, no cracking or collapsing observed in the storm snow. 

Region
Bridger Range
Location (from list)
Fairy Lake
Observer Name
N. de Leeuw

GNFAC Avalanche Forecast for Thu Jan 2, 2025

Snowpack and Avalanche Discussion

<p><strong><span><span><span><span><span><span>Here’s what we know:</span></span></span></span></span></span></strong></p>

<ul>
<li><span><span><span><span><span><span>A lot of snow has fallen during the last week+. The Bridger Range had an impressive 3 day storm total of 35 inches (2.45 inches of SWE). Most other areas have gotten similar snowfall containing 2-3 inches of SWE but spread out over the last week.&nbsp;</span></span></span></span></span></span></li>
<li><span><span><span><span><span><span>More snow is coming with higher water amounts going into this weekend.</span></span></span></span></span></span></li>
<li><span><span><span><span><span><span>The snowpack continues to talk to us with collapsing, whumpfs, and avalanches. </span></span></span></span></span></span><a href="https://www.mtavalanche.com/snow-observations-list"><span><span><span><… out our observations page</span></span></u></span></span></span></span></span></a><span><span><span><span><span><span> to view the latest reports with all these red flags.</span></span></span></span></span></span></li>
<li><span><span><span><span><span><span>Visibility has generally been poor (b/c it’s snowing so much), so we don’t really know the full extent of avalanche activity. There has likely been a lot more than has been observed or reported.</span></span></span></span></span></span></li>
<li><span><span><span><span><span><span>There is a widespread layer of weak faceted snow now buried 1.5-3 feet deep (more in wind loaded areas) that formed on the snow surface just after Thanksgiving into the first week of December.</span></span></span></span></span></span></li>
<li><span><span><span><span><span><span>Winds have generally been light the last 3 days (especially in the Bridgers, weird right?) but that also means there is a lot of snow available for them to transport when they eventually pick up.</span></span></span></span></span></span></li>
</ul>

<p><span><span><span><span><span><span><strong>The best travel advice</strong> for today is to remain patient, be conservative, and enjoy fantastic powder riding on slopes less than 30 degrees in steepness.&nbsp;</span></span></span></span></span></span></p>

<p><span><span><span><span><span><span><strong>Assessing stability</strong> on individual slopes is challenging right now and worth considering the big picture (many red flags). Ian discusses the challenges in his </span></span></span></span></span></span><a href="https://www.youtube.com/watch?v=GpUgf_rn2qs"><span><span><span><span><s… from skiing near Hebgen Lake</span></span></u></span></span></span></span></span></a><span><span><span><span><span><span> yesterday. So much snowfall is great in the long run because the snowpack will become strong and stable. In the short term, all that new snow is adding weight and stress which lead to avalanches. Also, areas where the weak layer is buried closer to 3 feet deep will probably not give you any obvious signs of instability like collapsing but may still produce an avalanche.</span></span></span></span></span></span></p>

<p><span><span><span><strong><span><span>Persistent slab avalanches 1.5-3 feet deep</span></span></strong></span></span></span><span><span><span><span><span><span> or deeper in high alpine terrain are the primary problem.&nbsp; I’m unsure of the likelihood of triggering one of these slides but am sure today has dangerous avalanche conditions because so many red flags are present. For today the avalanche danger is CONSIDERABLE.</span></span></span></span></span></span></p>

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