Northern Gallatin

Natural Avalanches in Swan Creek

Swan Creek
Northern Gallatin
Code
HS-N-R2-D2-O
Aspect
N
Latitude
45.37610
Longitude
-111.09400
Notes

Observed sometime between 03/06/2024-03/13/2024: 

"Just finished a weeklong ski from west Yellowstone to bear canyon, and thought I’d chime in that I didn’t observe anything that hasn’t been reported on already. I saw lots of deep slabs breaking near the ground, primarily on the north half of the compass. But sometimes not!.... It was interesting to see that despite the lack of snow, some avalanches were running almost full track. It seems like after a week of being on the snow I would see some sort of pattern, but I feel like I ended the trip with the same amount of confidence I entered it with, and didn’t feel comfortable exposing myself to hardly anything. 
I attached a couple photos of a slide I saw toward the head end of Swam Creek. The crown was 2-5’ deep and ~2000’ wide, and it stopped within 50’ of old growth timber. "

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Hard slab avalanche
Trigger
Natural trigger
R size
2
D size
2
Bed Surface
O - Old snow
Problem Type
Persistent Weak Layer
Snow Observation Source
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year

Skiers a few days ago saw several deep natural avalanches near the head of Swan Creek. These avalanches broke 2-5' deep, 2000' wide, and ran "full track". The exact date of when these avalanches happened is unknown but they likely happened over a week ago in the first few days of March. Photo: S. Reinsel

Northern Gallatin, 2024-03-13

Skiers a few days ago saw several deep natural avalanches near the head of Swan Creek. These avalanches broke 2-5' deep, 2000' wide, and ran "full track". The exact date of when these avalanches happened is unknown but they likely happened over a week ago in the first few days of March. Photo: S. Reinsel

 

 

Northern Gallatin, 2024-03-13

Large avalanche N face Blackmore

Mt Blackmore
Northern Gallatin
Code
HS-NC-R3-D3.5-O
Elevation
9800
Aspect
N
Latitude
45.44440
Longitude
-111.00400
Notes

Large avalanche North face Mt Blackmore. Appeared to be potentially triggered by cornice fall from above. Crown propagated across majority of the bowl and was quite large in places. 

From Obs: "Cornice fall triggered a big one. Looks to be real fresh. last night or this morning    Broke across the whole bowl and up to 8 feet deep maybe more right in the middle. Broken trees in the debris, And ran out of sight."

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Hard slab avalanche
Trigger
Cornice fall
R size
3
D size
3.5
Bed Surface
O - Old snow
Problem Type
Persistent Weak Layer
Slab Thickness
96.0 inches
Vertical Fall
1000ft
Slab Width
600.00ft
Slab Thickness units
inches
Single / Multiple / Red Flag
Single Avalanche
Advisory Year

Skiers noted a large natural avalanche on the North face of Mt Blackmore that broke overnight. The crown was around 8 feet deep. Photo: E. Roman

Northern Gallatin, 2024-03-11

Large avalanche N face Blackmore

Date
Activity
Skiing

Large avalanche North face Mt Blackmore. Appeared to be potentially triggered by cornice fall from above. Crown propagated across majority of the bowl and was quite large in places. 

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

deep slab north side mt blackmore

Date
Activity
Skiing

Cornice fall triggered a big one. Looks to be real fresh. last night or this morning    Broke across the whole bowl and up to 8 feet deep maybe more right in the middle    Broken trees in the debris, And ran out of sight.  

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