Trip Planning for Northern Gallatin

Around 7 p.m. Monday night, a few miles up Portal Creek, triggered from bottom of slope.

Around 7 p.m. Monday night, a few miles up Portal Creek, triggered from bottom of slope.

Small wind slab in hyalite at the start to champaign slot, 7600’, WNW, ~8” crown. Photo: S Bonucci

Small wind slab in hyalite at the start to champaign slot, 7600’, WNW, ~8” crown. Photo: S Bonucci 

Divide Pk 9600ft SE facing snowpit on 27 Dec 2024 with ECTP27 and ECTP23 at 22" deep

Divide Pk 9560ft E facing snowpit, ECTP30 about 24" deep on 27 Dec 2024

Above 9000’ winds were actively loading the snow and I got cracking and a very small slab to release on a small wind drifted roll over at 9500’ on a N aspect. Photo: E Heiman

There was some natural avalanche activity on the peak south of mt Bole. Photo: Anonymous

Observed from Flanders this morning. Presumed recent natural slide around ~9950 ft. on a E/NE aspect. Photo: E Webb

The power of the winds was emphasized by the scoured west side of the East Ridge of the Main Fork. Photo: E Webb

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

Plumes of drifting snow in the Bridger Range as strong winds blasted the mountains. Photo: GNFAC

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

Photo: B Durrum 

Photo: M. Legler 

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

Ice gullies snowpack

Photo: GNFAC

Snowpit on the Mt Blackmore 

Photo: GNFAC

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 

8" of new snow at the Grotto Falls TH. Photo: GNFAC

Multiple pits yielded propagation in ECTs for a group in Beehive Basin on Saturday. Photo: E. Stutzman

"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 

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

WE facing snow at 8100 ft Cabin Ck

SE facing snow Cabin Creek

N facing snow Cabin Creek, 9000 ft

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

Cracking on old, faceted, October snow hundreds of feet long. North facing near treeline. Photo: BSSP

Intentional, human-triggered avalanche by a ski patrol breaking at the ground on a north facing slope near treeline. Photo: BSSP

Photo: A.A.

Photo: A.A.

Photo: A.A.

A 12" deep snowpack at History Rock. 11/14/24. Photo: GNFAC

Snow and dirt at History Rock on November 14, 2024. Photo: GNFAC

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

Snowpit at Bridger Bowl on 11/5. Photo: B. VandenBos

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

An intense period of snowfall on October 28 dropped 6” of snow in the Hyalite Canyon area. Photo: GNFAC

From obs: "1-3 mm faceting in front of the Montage. Clear skys and mid 20 temps"

A hiker on Mt. Blackmore noted 5-10 inches of snow on east through north aspects. Photo: B. VandenBos