20-21

Whumphing and small dry loose slides near Ross Peak

Ross Peak
Bridger Range
Code
Latitude
45.85860
Longitude
-110.95600
Notes

From skiers obs 2/6/21: "Observations for 6600’ to 8300’, E and NE aspects [near Ross Peak]: - Saw several natural dry loose avalanches (D1) on upper NE face of Ross - No slab avalanches observed - Observed at least two dozen whumphs (mostly small and localized) while skinning - no cracking - winds were steady moderate in the afternoon, lots of blowing and drifting snow observed; winds primarily from W but also NW and N - average ski pen around 30 cm"

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

Natural below Maid of the Mist

Hyalite - main fork
Northern Gallatin
Code
N-R2-D1.5
Elevation
8000
Aspect
NE
Latitude
45.41750
Longitude
-110.96600
Notes

Natural slide below Maid of the Mist (unless someone was up climbing Maid No More...). E/NE aspect, roughly 8000' elevation. Looked to have run last night or early this morning. Poor resolution iphone photo, but gets the job done. Photo taken from the base of the Dribbles.

Number of slides
1
Number caught
0
Number buried
0
Trigger
Natural trigger
R size
2
D size
1.5
Problem Type
New Snow
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year

From obs 2/6/21: "Natural slide below Maid of the Mist (unless someone was up climbing Maid No More...). E/NE aspect, roughly 8000' elevation. Looked to have run last night or early this morning. Poor resolution iphone photo, but gets the job done. Photo taken from the base of the Dribbles." Photo: M. Zia

Northern Gallatin, 2021-02-07

Large Natural avalanches on Saddle Peak and Truman Gulch

Saddle Peak
Bridger Range
Code
HS-N-R3-D2.5-O
Elevation
9000
Aspect
NE
Aspect Range
NE, W
Latitude
45.79430
Longitude
-110.93600
Notes

From BBSP on 2/6/21" "Clear vis gave us a good view of  natural avalanches on Saddle peak , the Football field and Behind D-rtand the nose on Truman Gulch that ran yesterday morning (2/5/21)"

Number of slides
3
Number caught
0
Number buried
0
Avalanche Type
Hard slab avalanche
Trigger
Natural trigger
R size
3
D size
2.5
Bed Surface
O - Old snow
Problem Type
Persistent Weak Layer
Slab Thickness
36.0 inches
Vertical Fall
1600ft
Slab Width
1000.00ft
Slab Thickness units
inches
Single / Multiple / Red Flag
Multiple Avalanches
Advisory Year

Collapses and small remote triggered avalanche specimen crk

Specimen Creek
Southern Gallatin
Code
Latitude
45.02650
Longitude
-111.04800
Notes

From Obs: "Big whumf a cracking on south east slope 8000 feet elevation. sub 25 degrees angle. Super loud and scary when it fractured. Broke to the ground. Small crown up higher on same slope." 

A separate group wrote: "We got 5-6 good whumphs while skinning around. It was snowing S-1 all day with light winds. We saw a group skiing a low angle ridge with a fresh crown off to the side of the ridge where it’s steeper, maybe 10-20’ from their tracks. It looked very much like they remote triggered it but I can’t be sure. The slide was R1D1.5, definitely broke into old snow."

Number of slides
2
Number caught
0
Number buried
0
Problem Type
Persistent Weak Layer
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Multiple Avalanches
Advisory Year