From obs: "On our way up the summer trail route to Hyalite Peak our party of three remotely triggered a small avalanche from the skin track at around 9,600ft on a east facing aspect. The storm slab went about 4 inches deep and 150-200ft across a small roll over feature. We were about 150ft away when we triggered the slide." Photo: C. Kussmaul
Northern Gallatin
Mt Blackmore
Date
Activity
Skiing
Skied Mt Blackmore this morning. Skinned up the SE ridgeline and dug a pit at 9700ft on a 25 deg S facing slope. 120cm snow depth, 15cm of new snow on top of a stout ice crust. No unstable stability test results, facets at the ground were moist and 4F. The remainder of the snowpack was very well bonded and almost hard to cut with a snow saw. Did observe a few small crowns that appear to have broken within the new snow on steep terrain across the basin.
Region
Northern Gallatin
Location (from list)
Mt Blackmore
Observer Name
Mike Lavery
Hyalite Reservoir / Meadows south of the reservoir
Date
Activity
Skiing
Was out for a tour at the meadows above Hyalite Reservoir. We were curious about the water affecting the snow pack, dug a pit on a north-west facing aspect around 7800 feet. Snow pack was 135 cm deep, performed a ECT test and got ECTP 11 on the depth hoar at the ground. Stayed off steep slopes and had a fun mellow powder day.
Region
Northern Gallatin
Observer Name
Spencer Lipsteuer
Hyalite Peak
Date
Activity
Skiing
On our way up the summer trail route to Hyalite Peak our party of three remotely triggered a small avalanche from the skin track at around 9,600ft on a east facing aspect. The storm slab went about 4 inches deep and 150-200ft across a small roll over feature. We were about 150ft away when we triggered the slide. This dramatically altered our tour plan, but we still stepped out into some avalanche terrain later in the day. By mid-morning it was quite hot up high and much of the new snow had consolidated into a few inches of heavy slop that was much less excited to move. I’ve attached a picture but it’s quite cloudy and I didn’t have anything in frame for reference... so maybe not very helpful.
Region
Northern Gallatin
Location (from list)
Hyalite Peak
Observer Name
Chris Kussmaul
Natural cornice fall nearly missed skiers, near Abiathar
Abiathar Peak
Out of Advisory Area
Code
C-N-R2-D2
Elevation
9500
Aspect
N
Latitude
44.97560
Longitude
-110.03100
Notes
From email: "My partners and I were booting up a couloir near abiathar and a large cornice fell and landed shortly below us in our bootpack. Spooked the hell out of us. We acknowledged the danger of those cornices before booting up, decided that it was probably safe due to relatively low winds and cool temps, and decided to go for it. In hindsight, we wonder if it was much warmer on the ridge near the cornice (we were in the shade), maybe we underestimated the ridgetop winds, or maybe we just got unlucky.
The cornice broke up a bit on some rocks before landing in our couloir, but there still vehicle sized chunks raining down. If we had been 5 minutes slower on the ascent we may have been killed."
Number caught
0
Number buried
0
Avalanche Type
Cornice fall
Trigger
Natural trigger
R size
2
D size
2
Problem Type
Cornice Fall
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year
Lewis creek
Date
Activity
Snowboarding
Went for a hike on a ridge line between Lewis creek and mill for hyalite creek. Saw the avalanche on a south/south east facing aspect around 9500’. I didn’t see how far it ran, but last year it broke loose and took out a lot of trees(video). Hard to tell how deep it broke but it broke pretty wide.
Region
Northern Gallatin
Observer Name
Elton