22-23

Deep Slab Avalanche Seen From Taylor Fork

Taylor Fork
Southern Madison
Code
HS-N-R3-D3-O
Elevation
10000
Aspect
N
Latitude
45.06070
Longitude
-111.27200
Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Hard slab avalanche
Trigger
Natural trigger
R size
3
D size
3
Bed Surface
O - Old snow
Problem Type
Deep Persistent Slab
Vertical Fall
1000ft
Slab Width
500.00ft
Snow Observation Source
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year

Avalanches Above Beaver Creek

Beaver Creek
Southern Madison
Code
SS-N-R2-D2-I
Elevation
9000
Aspect
NE
Latitude
44.87200
Longitude
-111.36100
Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Natural trigger
R size
2
D size
2
Bed Surface
I - Interface between new and old snow
Problem Type
New Snow
Slab Thickness
13.0 inches
Vertical Fall
500ft
Slab Width
200.00ft
Snow Observation Source
Slab Thickness units
inches
Single / Multiple / Red Flag
Multiple Avalanches
Advisory Year

New Snow and Instability

Date
Activity
Snowmobiling

We rode to the Taylor Fork Weather station, then to the Wilderness Boundary above Beaver Creek, and then through Sage and Carrot Basin. There was 13-14" of new snow throughout the area. At the Wilderness Boundary we saw several R2-D2 avalanches on a NE facing ridgeline above Beaver Creek. We dug a pit on a SW aspect at 8,800' that was 9' in depth (HS: 279 cm). We had an ECTP 11 at the interface between the new and old snow. We also had an ECTP 24 on a layer of 1.0 mm facets sandwiched between two melt freeze crusts. These results and the recent avalanche activity highlighted the instability that exists from this most recent snow. When we were leaving our pit site the visibility improved, and we saw  a R3-D3 avalanche in a high alpine bowl. This avalanche confirmed that deep slab avalanches are still a concern for our advisory area.

Region
Southern Madison
Location (from list)
Taylor Fork
Observer Name
Dave Zinn, Alex Haddad

Large slide E face Ainger lake

Date
Activity
Skiing

Large natural on the E facing head wall above ainger lake. One smaller crown above the large main crown, broke on a deep layer. Debris ran past the lake. 

Region
Bridger Range
Location (from list)
Frazier Basin
Observer Name
Jack Ritterson