23-24

Snowpack and Test Scores on Woodward Mountain

Date
Activity
Skiing

Went for a ski tour in the Southern Madison's up Lightning Creek in search of a deeper snowpack. Our tour brought us up Woodward Mountain via the E sub-ridge with a plan to ski in the bowl to the north on a NE aspect. The snowpack varied immensely due to sun effect/wind loading but overall found 50-60 cm of snow in the deeper locations. We performed 3 CTs in representative locations of our intended ski line and had results of CT21 Q2, CT15 Q2, and CTN. The columns broke on a layer of 4F facets midway down from the surface. Combining this data with a lack of other signs of instability (cracking, whumpfing, recent avalanches, recent loading), we decided to ski our intended line. 

Snow quality on the ascent and decent varied from "ripple pow" to breakable wind crust to unbreakable wind crust. Overall, was a great day in the BC getting familiar with our early season snowpack even though good ski conditions lacked. 

Region
Southern Madison
Observer Name
Eric Heiman

Snowpack and Test Scores in October Bowl

Date
Activity
Skiing

Went for a couple quick tours over the past two days in the Northern Bridgers. In October Bowl at 8157' on a NE aspect I found a HS of 30 cm with recent fist hard snow in the top 10 cm. The new snow sat on top of a 5 cm knife hard crust likely from the warm snow/rain event last week. Below the crust were 15 cm of 1F facets. The crust progressively deteriorated when moving up in elevation. Near the top of October Bowl I performed two CTs in a a location where the HS = ~50 cm. My results were CT12 Q3 and CT15 Q3. 

Region
Bridger Range
Location (from list)
Hardscrabble Peak
Observer Name
Eric Heiman

South of Cooke City

Date
Activity
Skiing

No avalanche activity was seen during a short tour south of Cooke City. ~1-1.5' of snow at low-mid elevations. Supportable crust on solar slopes with 3-4" of new snow on top. 

Region
Cooke City
Observer Name
Zach Peterson

Variable Snowpack Conditions

Date
Activity
Skiing

On our way up the main fork we noticed a drastic increase in snow depth, and wind effect with elevation. The height of snow was around 50-70cm near 9500 ft/treeline, though we were walking anywhere below 8200 ft. As well, the effects of the wind during the week were very noticeable once near treeline, with some ENE aspects sheltering a 3-4 inch wind slab, which we also noticed in the lee of the many rocks and saplings still above the snow surface. Our pit (dug in a location without this windslab, but still loaded) showed a decently sound structure with good test results.

A separate party mentioned that they had seen the remnants of an avalanche higher in the bowl near the summer trail, but we did not go this high and did not see it ourselves.

Region
Northern Gallatin
Location (from list)
Hyalite - main fork
Observer Name
Wyatt Hubbard

Drifted snow with facets underneath

Date
Activity
Snowshoeing

Got into the bowl below the face of the peak and didn’t feel comfortable going any further wind slabs were present on the level surfaces around the lake with facets underneath that. Also note that snow depth was minimal to about a foot but quickly increased around the 9000ft mark to the 2-3ft range. 

Region
Northern Gallatin
Location (from list)
Hyalite Peak
Observer Name
Sawyer Haupt

Pit observations across from the Great One

Date
Activity
Skiing

We went up to check out the bottom of The Great One and saw where the old slide occurred. Wind loading had already built up snow right at the crown. We did some pole made single columns and consistently pulled off 6 inch chunks. We turned around and skied the lower part of The Great One. We dug two pits below The Other One and had the lower pit fail a ect at 26 and the higher one at 13. I attached a video of the lower pit. We turned around and skied out after.

Region
Bridger Range
Location (from list)
Sacajewea Peak
Observer Name
Alex Crawford

GNFAC Avalanche Forecast for Fri Nov 10, 2023

Snowpack and Avalanche Discussion

<p><span><span><span><span><span><span>Snow is starting to pile up at high elevations and with that comes avalanches. On Wednesday, skiers triggered a wind slab that broke 1.5 ft deep in The Great One on Naya Nuki Peak in the northern Bridger Range (</span></span></span></span></span></span><a href="https://www.mtavalanche.com/node/29256"><span><span><span><strong><span… and photos</span></span></u></span></strong></span></span></span></a><span><span><span><span><span><span>). Thankfully the skier was able to self arrest and only took a short ride. Natural avalanches were also reported yesterday on Henderson Mtn, near Cooke City (</span></span></span></span></span></span><a href="https://www.mtavalanche.com/node/29264"><span><span><span><strong><span…;).</span></span></span></span></span></span></p>

<p><span><span><span><span><span><span>Don’t get fooled by the bare ground at lower and mid elevations, if you’re headed to the high peaks you need to be thinking about avalanches. Any steep, snow covered slope is suspect. This is true whether you’re seeking out earlier season turns on skis or board, approaching ice climbs, hunting, or squeezing in the last hikes of the season. Either avoid these slopes or take the proper precautions, including having a partner, going one at a time, and carrying avalanche rescue gear that you’ve practiced using (avalanche beacon, shovel, and probe).</span></span></span></span></span></span></p>

<p><span><span><span><span><span><span>Conditions will trend towards stability as we get further out from the last snowfall, but wind drifting and loading will continue. Be wary of slopes that have gotten recently windloaded (look for dense pillows of continuous snow cover). If you’re planning on crossing or riding one of these steep windloaded slopes, watch for signs of instability such as cracks shooting out in front of you or recent avalanches and consider doing a quick stability test before committing to the slope.&nbsp;</span></span></span></span></span></span></p>

<p><span><span><span><span><span><span>Your observations are more important than ever during the early season as we get to know this season’s developing snowpack. If you get out, please share avalanche, snowpack or weather observations via our </span></span></span></span></span></span><a href="blank"><span><span><span><strong><span><u><span><span>website</span></span></u></span></strong></span></span></span></a><span><span><span><span><span><span>, email (</span></span></span></span></span></span><a href="mailto:mtavalanche@gmail.com"><span><span><span><strong><span><u><span>…;), phone (406-587-6984), or Instagram (#gnfacobs).&nbsp;</span></span></span></span></span></span></p>

<p><span><span><span><span><span><span>We’ll be updating the </span></span></span></span></span></span><a href="https://www.mtavalanche.com/weather/wx-avalanche-log"><span><span><span… and Avalanche Log</span></span></u></span></strong></span></span></span></a><span><span><span><span><span><span> daily and issuing pre-season bulletins as needed throughout the fall as conditions warrant.&nbsp;</span></span></span></span></span></span></p>

<p>&nbsp;</p>

Upcoming Avalanche Education and Events

Our education calendar is full of awareness lectures and field courses. Check it out: Events and Education Calendar.

Avalanches on Henderson Mtn

Henderson Mountain
Cooke City
Code
N-R2-D2
Latitude
45.05240
Longitude
-109.94500
Notes

Avalanches on Henderson Mountain near Cooke City were reported via instagram on 11/9/2023. Estimating they occurred a day earlier. 

From message: "on Henderson in Cooke just above the lulu trail. It was surprising to see so much activity"

Number of slides
1
Number caught
0
Number buried
0
Trigger
Natural trigger
R size
2
D size
2
Snow Observation Source
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year