Northern Gallatin

Mt Bole/Twin Falls Basin

Date
Activity
Skiing

140-160 cm on the ground on a NNE aspect at 9600’. ECTP-14 on a FC layer 35 cm down. The snowpack was generally right side up but interspersed with at least two other thin persistent layers below the one we saw propagate. I was pleasantly surprised at the lack of major basal facets, at least in the spot where we dug. Despite the dramatic, planar ECT result there were no other signs of instability or recent avalanches, and I ski cut a number of heavily wind loaded small features with no result. The wind slabs were quite stubborn but our observations of the underlying snowpack definitely increases the spook factor for me today, at least in this range.

Region
Northern Gallatin
Observer Name
Henry Coppolillo

Shooting cracks at Telemark Meadows

Telemark Meadows
Southern Madison
Code
Latitude
44.88990
Longitude
-111.06300
Notes

From observation: "the 12" or so of facets on the ground have no cohesion  .. there is 12-18" of fairly high moisture content snow on the facets ... On several steeper slopes there was considerable collapsing and shooting cracks but no whumpfing. I am sure these would have slid if the slope angle was steep enough."

Number of slides
0
Number caught
0
Number buried
0
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Red Flag
Advisory Year
20-21

Natural Loose Snow Avalanche - Divide Cirque

Divide Cirque
Northern Gallatin
Code
L-N-R1-D1-I
Elevation
9800
Aspect
SE
Latitude
45.39400
Longitude
-110.98100
Notes

Small, loose snow avalanche in the Divide Cirque in Hyalite Canyon. Released naturally sometime during the weekend's storm. These could push a skier into/ off obstacles such as trees and cliffs.

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Loose-snow avalanche
Trigger
Natural trigger
R size
1
D size
1
Bed Surface
I - Interface between new and old snow
Problem Type
New Snow
Slab Thickness
15.0 centimeters
Vertical Fall
150ft
Slab Width
50.00ft
Weak Layer Grain type
Precipitation Particles
Weak Layer Hardness
F
Images
Loose Snow Avalanche - Divide Cirque
Attached Videos
Watching for the Tipping Point - 13 December 2020
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year
20-21

History Rock

Date
Activity
Skiing

Toured History Rock today and skied the upper and middle meadows. Saw around 6 inches of storm snow sitting on top of faceted grains. The upper meadow snowpack varied from 30-50 cm with the deeper snow being closer to the bottom. It was all unconsolidated snow and did not observe any instabilities. Pretty good skiing!

Region
Northern Gallatin
Observer Name
Nick Roe
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