Northern Gallatin

Loose avalanches on blackmore

Date
Activity
Skiing

Multiple natural loose avalanches in the steep terrain of mt Blackmore. All originated at the base of cliffs or trees. Counted 4 prominent ones

Region
Northern Gallatin
Location (from list)
Mt Blackmore
Observer Name
Max

Loose snow avalanches around Blackmore

Mt Blackmore
Northern Gallatin
Code
L-R1-D1
Aspect Range
N-E-SE
Latitude
45.44440
Longitude
-111.00400
Notes

Saw lots of small loose avalanches on Mt Blackmore and nearby slopes, some appeared to be natural and others skier triggered. We saw multiple dry loose on N and E aspects and a wet loose on a southeast aspect.

We also noticed recent wind loading on the southeast side of ridgetops and scouring on north slopes.

Number caught
0
Number buried
0
Avalanche Type
Loose-snow avalanche
R size
1
D size
1
Problem Type
New Snow
Snow Observation Source
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Multiple Avalanches
Advisory Year

Loose avalanches around Blackmore

Date
Activity
Skiing

Saw lots of small loose avalanches on Mt Blackmore and nearby slopes, some appeared to be natural and others skier triggered. We saw multiple dry loose on N and E aspects and a wet loose on a southeast aspect.

We also noticed recent wind loading on the southeast side of ridgetops and scouring on north slopes.

Region
Northern Gallatin
Location (from list)
Mt Blackmore
Observer Name
Heather Myers

Dust on Crust in Hyalite

Date
Activity
Snowboarding

Got up early and cruised around on some different aspects on Mt Blackmore. Got some shooting cracks on the N side of the mountain mid slope, textured snow and snow drifts were widespread in the basin on N aspects.  Found great skiing in N facing trees on that side of the mountain lower down below the apron and such.

East face had some top loading, nothing I was concerned about below ridge lines, save for some fast sluffs!

Found some isolated pockets of surface hoar, nothing widespread.

All in all, a fun morning, be curious to see how this next one affects the stability picture. 

 

Region
Northern Gallatin
Location (from list)
Mt Blackmore
Observer Name
George Faegre

Faceted Snow Near Surface In Hyalite

Date
Activity
Snowboarding

Toured up Flanders Creek to the main cirque. I was wondering what the snow surface was doing with the high pressure. I dug a pit on a NNW aspect at 8900'. HS 205cm, light SW wind, clear skies and air temp was 2.1 C at 4pm. Dust layer was down 60cm from the surface.

I didn't get any propagating results in my pit and the snowpack was right side up. I did notice a strong temperature gradient in the top few centimeters of snow. I only found this on sheltered, shaded slopes with dry powdery snow. I did not find a strong temp gradient or facets in dense wind affected snow. Something to keep in mind if we get a big dump of snow in the near future.

Region
Northern Gallatin
Location (from list)
Flanders Creek
Observer Name
Braeden Oackes

Cornice Fall Wind Slab Avalanche in Storm Castle Creek

Storm Castle
Northern Gallatin
Code
SS-NC-R2-D2-I
Aspect
E
Latitude
45.45040
Longitude
-111.22400
Notes

Toured much of the Hyalite zone yesterday.  Winds calmed, sun came out mid day.  1” of new snow and 3” the day before.  Skiing was great.  Saw a couple huge cornices that had broken off.  From the top of Devide peak we observed what looked like a cornice release above the headwaters of storm castle creek which triggered a slab, east facing aspect.  Looked to be several feet deep and ran a long way. No other signs of instability observed.  Great skiing. Solar aspects were saturated by the afternoon.

 

 

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Cornice fall
R size
2
D size
2
Bed Surface
I - Interface between new and old snow
Problem Type
Wind-Drifted Snow
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year