Southern Gallatin

Skier triggered large Wet loose on the fin

Republic Mountain
Cooke City
Code
L-ASu-R2-D2-I
Elevation
10000
Aspect
E
Latitude
45.00030
Longitude
-109.95400
Notes

From obs.: “Our party (3) triggered a significant wet loose slide on the fin today. I, the first skier dropped in next to existing tracks from earlier in the morning. I made a couple of small turns in unskied snow to test it and decided that not much was moving. As I continued down the wet surface snow started to slide and accumulate. My partner called me on the radio to tell me a lot of snow was moving behind me and I cut left. I traversed hard to lower angle terrain until I felt I could safely descend the rest of the slope.  My partners descended the bed surface until they could traverse out. 

We made several key mistakes today.  We knew it would be warm and that we should be up and down early.  We left later than planned, moved slower than expected and failed to adjust our plan.  We mistook lack of wet loose activity on similar aspects and elevations on features we could see as sign of stability.  We failed to make a plan B or establish a turnaround time.  We interpreted a party ahead of us that skied the slope as a go ahead.  Another party approaching behind us added pressure to go. They also skied the slope after us in similar style to my partners.

In our favor, we communicated well, radios were key, stayed calm and we managed ourselves through the situation. I feel humbled and lucky to have gotten away with a free lesson.  One that I didn't think I should have needed.”

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Loose-snow avalanche
Trigger
Skier
Trigger Modifier
u-An unintentional release
R size
2
D size
2
Bed Surface
I - Interface between new and old snow
Problem Type
Wet Snow
Slab Thickness
6.0 inches
Vertical Fall
900ft
Slab Width
250.00ft
Snow Observation Source
Slab Thickness units
inches
Single / Multiple / Red Flag
Single Avalanche
Advisory Year

Remote trigger in little bear

Date
Activity
Snowmobiling

From IG message 4/17/24: "Remote trigger up little bear today. Went to the groundish."

Region
Northern Gallatin
Location (from list)
NORTHERN GALLATIN RANGE
Observer Name
Loren Griswold

Wet Slab in Yellowstone

Other place
Out of Advisory Area
Code
WS-N-R2-D2-O
Elevation
7500
Aspect
N
Latitude
44.64320
Longitude
-110.95400
Notes

Saw what looked like a wet slab avalanche from the road along the Madison River.  Roughly north facing slope at 7500'.

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Wet slab avalanche
Trigger
Natural trigger
R size
2
D size
2
Bed Surface
O - Old snow
Problem Type
Wet Snow
Vertical Fall
250ft
Slab Width
150.00ft
Snow Observation Source
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year

Wet Slab Avalanche Above Quake Lake

Quake Lake
Southern Madison
Code
WS-N-R2-D2-G
Latitude
44.85240
Longitude
-111.39200
Notes

From IG: Wet slide to the ground above Quake Lake. 

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Wet slab avalanche
Trigger
Natural trigger
R size
2
D size
2
Bed Surface
G - Ground
Problem Type
Wet Snow
Vertical Fall
300ft
Slab Width
150.00ft
Snow Observation Source
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year