Northern Gallatin

Small cornice triggered slide above Blackmore Lake

Mt Blackmore
Northern Gallatin
Code
NC-R1-D1-S
Aspect
E
Latitude
45.45990
Longitude
-110.99800
Notes

On Monday, March 22, skiers toured west of Blackmore Lake and observed a natural slide of the new snow below a cornice.

Number of slides
1
Number caught
0
Number buried
0
Trigger
Cornice fall
R size
1
D size
1
Bed Surface
S - Avalanche released within new snow
Problem Type
New Snow
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year

Small soft slab triggered on Mummy (Flanders Side)

Flanders Creek
Northern Gallatin
Code
SS-AFu-R1-D1-S
Aspect
N
Latitude
45.44730
Longitude
-110.94200
Notes

We left the car with subdued expectations this morning, but were happy to find the new snow bonding well where it hadn’t been slab-ified by the wind. Near the top of Mummy’s North Couloir a shallow (<6”) soft slab broke at my feet as I was wallowing up the boot pack and ran a decent way down the gully- harmless in that spot but with more exposed terrain above we turned tail and enjoyed some excellent skiing.

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Foot penetration
Trigger Modifier
u-An unintentional release
R size
1
D size
1
Bed Surface
S - Avalanche released within new snow
Problem Type
New Snow
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year

Mummy (Flanders Side)

Date
Activity
Skiing

We left the car with subdued expectations this morning, but were happy to find the new snow bonding well where it hadn’t been slab-ified by the wind. Near the top of Mummy’s North Couloir a shallow (<6”) soft slab broke at my feet as I was wallowing up the boot pack and ran a decent way down the gully- harmless in that spot but with more exposed terrain above we turned tail and enjoyed some excellent skiing. No other signs of instability, but the new snow that fell throughout the morning was lower density and will transport easily if and when the wind returns.

Region
Northern Gallatin
Location (from list)
Flanders Creek
Observer Name
Henry Coppolillo

Blackmore Lake

Date
Activity
Skiing

Yesterday we toured in the area west of Blackmore Lake. We observed a natural slide of the new snow layer below a cornice (attached photo). The new snow felt poorly bonded on all aspects we travelled on (North, East and South). An unfortunate gear malfunction cut our time short and a pit was not dug. Multiple 'ski cuts' on the skin track revealed the new snow had the energy to move, but, at least in areas without substantial wind loading, did not form a cohesive slab.

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

Maid of The Mist

Date
Activity
Skiing

Skied Maid of the Mist today. Tracks were on the slope from what seemed to be the day prior. Dug a quick pit and found 27 cm of storm snow on top of a solid (1F+) layer of ice forms about 5 cm thick. Slope angle was around 28-30 degrees, ENE aspect. No wind transport, short bursts of S2 snow with steady light flurries all day. Both CT and ECT tests yielded no remarkable results. Skied the slope and fun was had.

Region
Northern Gallatin
Location (from list)
Maid of the Mist
Observer Name
Nick Roe

Skier Triggered Avalanche, Mount Blackmore

Mt Blackmore
Northern Gallatin
Code
SS-AS-I
Elevation
10000
Aspect
SE
Latitude
45.44440
Longitude
-111.00400
Notes

From email: "On our way out (from Alex Lowe Peak) we watched two skiers climbing to the top of a gully on the SE face of Blackmore... When I looked up again 5 minutes later, the gully had slid. Luckily, based on their tracks it looks like they triggered it from the top without getting caught and then skied it. The first skier was already at the bottom and the second was on his way down."

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Skier
Bed Surface
I - Interface between new and old snow
Problem Type
New Snow
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year

A pair of skiers were ascending the east-face of Alex Lowe Peak when they triggered an avalanche that broke 150' above them. One skier was caught and carried 250 vertical feet. No one was injured or buried. Photo: Anonymous

Northern Gallatin, 2021-03-21