Northern Gallatin

Slides triggered in Deer Creek, N. Madison

Deer Creek
Northern Madison
Code
SS-ARr-R1-D1-S
Elevation
6700
Aspect
NE
Latitude
45.29880
Longitude
-111.20400
Notes

"Today while touring in the Deer Creek drainage in the Northern Madisons my partners and I noticed many red flags. Wind was strong from the WSW. We had lots of collapsing and some cracking while touring up. We bailed on our main objective, and while returning to the car we triggered a wind slab remotely from the bottom flats of a gulley. A rider in our group began to descend when we felt and heard a large whumph, followed by a 3-5 second loud rumbling before a wind slab on the ridge above (100 yards away) released (SS-ARr-R1-D1-S, NE aspect @ 6700'). It was about 50' wide and 1-2' deep, but didn't have enough energy to run far down the slope. Touchy stuff!"

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Snowboarder
Trigger Modifier
r-A remote avalanche released by the indicated trigger
R size
1
D size
1
Bed Surface
S - Avalanche released within new snow
Problem Type
Wind-Drifted Snow
Slab Thickness
24.0 inches
Slab Width
50.00ft
Slab Thickness units
inches
Single / Multiple / Red Flag
Single Avalanche
Advisory Year

"...today we toured into an east aspect in the N. Madison. Winds were stronger than we anticipated, already western sides of ridges had been scoured to near bare ground. While skinning along the ridge we intentionally triggered large wind drifts and small cornices. We dug a pit on a south/south east aspect and got ectp 25. While skiing a low angle meadow back out to the ridge a member of our party remote triggered a small slide on a wind loaded pocket on an east aspect. According to my partner it was 75 ft wide and maybe a 1-2 feet deep.

Northern Madison, 2020-02-11

Collapsing and Cracking on Mt. Ellis

Mt Ellis
Northern Gallatin
Code
Elevation
8000
Aspect
E
Latitude
45.57770
Longitude
-110.95500
Notes

"I observed this collapse & propagation as I stepped over some wood in the skinner on the north ridge of Mount Ellis this morning, ~8000’, due East. I was tailing Chabot and his partner, and they had passed this way just minutes before."

Number of slides
0
Number caught
0
Number buried
0
Problem Type
Wind-Drifted Snow
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Red Flag
Advisory Year

"I observed this collapse & propagation as I stepped over some wood in the skinner on the north ridge of Mount Ellis this morning, ~8000’, due East. I was tailing Chabot and his partner, and they had passed this way just minutes before." Photo: D. Rider

Northern Gallatin, 2020-02-11