Northern Gallatin
Blackmore
Date
Activity
Skiing
Dug on an E (105deg) slope at 9600 feet on Mt. Blackmore. This was a quick pit not a full profile.
SKY: SCT Wind: L variable
HS 95cm
ECTN15 down 40cm on 1-2mm facets.
Snow above facets was mostly 4F to 4F+. While there was no propagation observed in the pit, the structure was quite poor. Additional stiffening of the slab and/or loading in the future could likely easily increase the propagation propensity.
approx. 3-4+mm facets down 60cm were also worth noting.
Recent wind effect was evident on lee slopes.
We had predetermined that avalanche terrain was "closed" for the day as we were just out collecting info/obs and skied low angle slopes and the rather spicy re-frozen skin track out.
Region
Northern Gallatin
Location (from list)
Mt Blackmore
Avalanche near Solstice, Hyalite
Hyalite - main fork
Northern Gallatin
Code
Latitude
45.43240
Longitude
-110.97500
Notes
Climbers in Hyalite saw an avalanche near Solstice that happened on 01/21. This avalanche is 1' deep at the crown and with 18" of facets snow below.
Number caught
0
Number buried
0
Snow Observation Source
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year
Climbers in Hyalite saw an avalanche near Solstice that happened on 01/21. This avalanche is 1' deep at the crown and with 18" of facets snow below. Photo: R. Meshew
Avalanche Details: Avalanche near Solstice, Hyalite
Northern Gallatin, 2024-01-21
Climbers in Hyalite saw an avalanche near Solstice that happened on 01/21. This avalanche is 1' deep at the crown and with 18" of facets snow below. Photo: R. Meshew
Avalanche Details: Avalanche near Solstice, Hyalite
Northern Gallatin, 2024-01-21
Slab to ground avalanche near Solstice in Hyalite
Date
Activity
Ice Climbing
1 foot slab on 18 inches of sugar facet.
Region
Northern Gallatin
Location (from list)
Hyalite - main fork
Observer Name
Rob Meshew
Remotely Triggered Avalanche Below Hyalite Peak
Hyalite Peak
Northern Gallatin
Code
SS-ASr-R1-D2-O
Aspect
E
Latitude
45.38710
Longitude
-110.96100
Notes
An avalanche was triggered by skiers crossing a slope 400' below the crown.
From obs: "My partner and I remotely triggered a persistent slide on an East facing slope at 9350ft. The slide ran off the Evil Twin ridge, just below the large main summer trail bowl of Hyalite Peak. My partner and I were spaced out ~50ft when we both felt and heard a large whumpf. We looked up and saw the avalanche slide, but were both out of harms way from the path. The starting zone was ~400ft above us and the slide ran ~500ft in total length. The crown was just over 2ft deep at its max and 150ft+ wide. The were signs of recent wind loading as we approached the bowl prior to the slide."
Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Skier
Trigger Modifier
r-A remote avalanche released by the indicated trigger
R size
1
D size
2
Bed Surface
O - Old snow
Problem Type
Persistent Weak Layer
Slab Thickness
18.3 inches
Slab Width
150.00ft
Images
Snow Observation Source
Slab Thickness units
inches
Single / Multiple / Red Flag
Single Avalanche
Advisory Year
From obs: "The crown was just over 2ft deep at its max and 150ft+ wide. The were signs of recent wind loading as we approached the bowl prior to the slide." Photo. T. Hoefler
Avalanche Details: Remotely Triggered Avalanche Below Hyalite Peak
Northern Gallatin, 2024-01-21