Observed from Flanders this morning. Presumed recent natural slide around ~9950 ft. on a E/NE aspect. Photo: E Webb
Trip Planning for Northern Gallatin
Past 5 Days
Considerable
Considerable
Considerable
Considerable
Moderate
Relevant Avalanche Activity
N-R2-D2
Elevation: 9,950
Coordinates: 45.4106, -110.9880
Caught: 0 ; Buried: 0
Observed from Flanders this morning. Presumed recent natural slide around ~9950 ft. on a E/NE aspect. Hard to tell from a distance, but cornice interference and/or wind loading are possible culprits. Poor image quality, but there may be more debris piles along the ridgeline to the south.
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SS-R1-D1-S
Caught: 0 ; Buried: 0
from @brendan_durrum_photo
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Coordinates: 45.4444, -111.0040
Caught: 0 ; Buried: 0
I observed a large whoomph about 150ft from the ridge (top of glades) going up Blackmore today while breaking trail. was definitely wind loaded area… I could feel the energy in the snowpack today once I got up higher, super sensitive it seems. ECTN 14 in my pit I dug lower down the meadow with no wind slab prevalent.
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Relevant Photos
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The power of the winds was emphasized by the scoured west side of the East Ridge of the Main Fork. Photo: E Webb
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I dug a pit on the SE shoulder of divide at around 9600’ and got a ECTP 14 on the persistent weak created during the long dry spell layer buried from this weeks storms. Photo: Anonymous
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Plumes of drifting snow in the Bridger Range as strong winds blasted the mountains. Photo: GNFAC
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From IG: On 12/15 "Storm slab broke about 200’ above us as skinning up the hallway coming from the north side on the throne." Photo: Anonymous
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Photo: B Durrum
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Photo: M. Legler
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Gusty winds transporting snow in Taylor Fork on Saturday. Triggered a 4-5 inch deep wind slab that propagated about 50 ft at the top of a north east facing slope at 9,500 ft.
Photo: JP
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Ice gullies snowpack
Photo: GNFAC
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Snowpit on the Mt Blackmore
Photo: GNFAC
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Light winds below treeline had little to effect on the snow in the history rock meadows. It was clearly blowing up high, with exposed nw faces stripped of snow and active transport visible off of Blackmore. Photo: W Hubbard
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8" of new snow at the Grotto Falls TH. Photo: GNFAC
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Multiple pits yielded propagation in ECTs for a group in Beehive Basin on Saturday. Photo: E. Stutzman
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"Intentionally triggered on a ski cut. Broke about 1 foot deep and 10 feet wide, ran on a hard compact surface below the soft wind slab. " Photo: Anonymous
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We noticed several natural loose snow avalanches (R1 D1) in steep rocky sections of the direct E face of Mt Blackmore. Though they were not large enough to bury someone, they would have strained a skier or rider through some nasty trees and cliffs. Photo: GNFAC
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WE facing snow at 8100 ft Cabin Ck
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SE facing snow Cabin Creek
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N facing snow Cabin Creek, 9000 ft
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Big Sky Ski Patrol triggered this avalanche during mitigation work in The Wave on 11/26/24... "2-3' deep on an ice crust just above the ground with a 2# shot in the Upper rodeo. Volume was limited as most of the snow was loaded just underneath the cornice, but still produced a sizeable size 2... Other paths in the Lenin region ran meaty wind slabs, full track with no significant step downs." Photo: BSSP
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Cracking on old, faceted, October snow hundreds of feet long. North facing near treeline. Photo: BSSP
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Intentional, human-triggered avalanche by a ski patrol breaking at the ground on a north facing slope near treeline. Photo: BSSP
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Photo: A.A.
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Photo: A.A.
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Photo: A.A.
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A 12" deep snowpack at History Rock. 11/14/24. Photo: GNFAC
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Snow and dirt at History Rock on November 14, 2024. Photo: GNFAC
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From obs: "Toured up into the Blackmore/Elephant basin today to get a sense of the snowpack ahead of the upcoming storm cycle. I poked around and dug in a few spots, trying to observe variations in snow depth and to observe where the snow has been faceting. Every pit I dug, ranging from N to SE facing, had faceting near the ground, all of which reacted in stability tests, if stubbornly. The most interesting test result was an ECTP21 in this layer of basal facets. That pit was dug in a large wind drift. I saw no propagation in any other pit or test.
Strong wind gusts were moving large amounts of snow in the alpine, while below treeline they did not exceed moderate speeds and wind transport was non existent. Large drifts were present on lee slopes, while more exposed windward slopes had little to no snow.
Otherwise the snowpack has behaved as one would expect. Solar aspects and exposed flats have a 2-3cm thick sun crust on the surface, and a further complex of crusts throughout the shallow snow pack. Snow depth ranged from 0 - 100 cm throughout the basin, and was generally thinner on solar aspects. Pretty bad skiing all around, not excluding the rock gardens on the skinner out." Photo: W. Hubbard
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Snowpit at Bridger Bowl on 11/5. Photo: B. VandenBos
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From e-mail: "Photo attached from near top of hyalite peak, 11/2. Cracking in recent hard wind slab, I had to really jump hard to make this. Walked on many other hard slabs that were well bonded. Highly variable snowpack. I think you'd be most likely to get into trouble by popping out a small hard slab pocket like this and getting magic carpeted into some thinly covered terrain." Photo: B. VandenBos
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An intense period of snowfall on October 28 dropped 6” of snow in the Hyalite Canyon area. Photo: GNFAC
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From obs: "1-3 mm faceting in front of the Montage. Clear skys and mid 20 temps"
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A hiker on Mt. Blackmore noted 5-10 inches of snow on east through north aspects. Photo: B. VandenBos
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A hiker on Mt. Blackmore noted 5-10 inches of snow on east through north aspects. Photo: B. VandenBos
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On October 17, rain turned to snow and blanketed the mountains of southwest Montana with a fresh coat of snow. Photo: Yellowstone Club Webcam
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On October 17, rain turned to snow and blanketed the mountains of southwest Montana with a fresh coat of snow. Photo: Bridger Bowl Webcams
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The 26th annual fundraiser for the Friends of the GNFAC is October 25 at the Emerson Cultural Center. More info and tickets at: https://events.eventgroove.com/event/Powder-Blast-2024-101627
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