Northern Gallatin

From e-mail: "Natural wet slides... caused us to back off our plan of heading that way and ski a north, shady aspect instead. On a southern aspect. 9000ft. 1:30pm. We dug a hasty pit and observed a weak layer about 1m down. The facets were beginning to round." Photo: K. Master

Northern Madison, 2020-03-23

Skier triggered wind slab on Wilson Peak

Wilson Peak
Northern Madison
Code
SS-ASu-R2-D1.5-I
Elevation
10100
Aspect
N
Latitude
45.32700
Longitude
-111.32500
Notes

From IG post with #gnfacobs: "I triggered a small windslab, mid slope on the north face of Wilson. It was a a pretty stubborn slab that broke above me. Cross loaded from lookers right. 6-8” deep." Photo: B Gill

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Skier
Trigger Modifier
u-An unintentional release
R size
2
D size
1.5
Bed Surface
I - Interface between new and old snow
Problem Type
Wind-Drifted Snow
Slab Thickness
8.0 inches
Vertical Fall
500ft
Slab Width
20.00ft
Slab Thickness units
inches
Single / Multiple / Red Flag
Single Avalanche
Advisory Year

From IG post with #gnfacobs: "I triggered a small windslab, mid slope on the north face of Wilson. It was a a pretty stubborn slab that broke above me. Cross loaded from lookers right. 6-8” deep." Photo: B Gill

Northern Madison, 2020-03-21

We dug near the top of Bacon Rind and found 155cm of snow. Our primary concern is with the upper snowpack. As it warms and wets we can expect an increase of avalanche activity on the ice crusts. Facets are still dry and soft at the bottom of the pack and I got this layer to break with an ECTP29. Photo: GNFAC

Southern Madison, 2020-03-18

Natural Cornice break and wet loose in Alex Lowe Basin

Alex Lowe Peak
Northern Gallatin
Code
WL-NC-R1-D1-I
Latitude
45.42530
Longitude
-111.01200
Notes

From the Blackmore/Elephant saddle I observed what looked to be a less than a day old cornice break which triggered a loose wet slide in front of it. The cornice debris was large, about the size of a VW beetle. Also observed some surface hoar on the north side of the saddle.

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Wet loose-snow avalanche
Trigger
Cornice fall
R size
1
D size
1
Bed Surface
I - Interface between new and old snow
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year

From the Blackmore/Elephant saddle, I observed what looked to be a less than a day old cornice break which triggered a loose wet slide in front of it. The cornice debris was large, about the size of a VW beetle. I also observed some surface hoar on the north side of the saddle. Photo: B. Gordon

Northern Gallatin, 2020-03-16