22-23

Snowmobile Triggered Avalanche Near Sage Mountain

Sage Peak
Southern Madison
Code
AMu-R3-D2-O
Aspect
E
Latitude
44.92770
Longitude
-111.24300
Notes

From FB message: “Near Sage Creek/Sage Mountain in carrot basin. This was a east facing, wind loaded slope. Snowmobile triggered below the rock line. No burials.”

Number of slides
1
Number caught
0
Number buried
0
Trigger
Snowmobile
Trigger Modifier
u-An unintentional release
R size
3
D size
2
Bed Surface
O - Old snow
Problem Type
Persistent Weak Layer
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year

From FB message: “Near Sage Creek/Sage Mountain in carrot basin. This was a east facing, wind loaded slope. Snowmobile triggered below the rock line. No burials.”

Southern Madison, 2023-01-03

Avalanche Near Sage Creek/Sage Mountain

Date
Activity
Snowmobiling

From FB message: “Near Sage Creek/Sage Mountain in carrot basin. This was a east facing, wind loaded slope. Snowmobile triggered below the rock line. No burials.”

Region
Southern Madison
Location (from list)
Sage Peak

Non-reactive on Flanders

Date
Activity
Skiing

Went up to Flanders today, dug a pit at approximately 9800ft on an east aspect. Snow depth was 154cm, with about 20cm of weak snow at the ground. We also found a weak layer at 112cm, which had a planar fracture during our shovel shear. Had an ECTx result, and when prying the column it pulled out as a cohesive block all the way to the ground. There was also quite a bit of surface hoar growth from about 7200ft to just below the summit.

Region
Northern Gallatin
Location (from list)
Flanders Creek
Observer Name
Brian Richards

Stable test results - Hyalite - East Fork Divide

Date
Activity
Skiing

We skied multile aspects off of the East Fork Divide. Peformed an ECT at 9,000' on a N facing slope with no results. Snowpack was 120cm. We didn't see any natural slides either. 

Region
Northern Gallatin
Location (from list)
Hyalite - East Fork
Observer Name
Zach Tondre

Storm Slab near Mt. Zimmer Yurt

Zimmer Creek
Cooke City
Code
SS-ARu-D1.5-I
Elevation
9000
Aspect
SE
Latitude
45.08220
Longitude
-109.89500
Notes

From obs: "A small, snowboarder-triggered avalanche from 12/31 on a southeast-facing slope at 9,000 feet broke on the 30cm layer and stepped down to the 40cm layer. The snowboarder was briefly caught in the sliding snow but maintained his footing as the snow washed past him."

Number of slides
1
Number caught
1
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Snowboarder
Trigger Modifier
u-An unintentional release
D size
1.5
Bed Surface
I - Interface between new and old snow
Problem Type
New Snow
Snow Observation Source
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year