18-19

Avalanche near Ross Peak/Throne

Ross Peak
Bridger Range
Code
HS-AMu-R2-D2-O
Elevation
8000
Aspect
E
Latitude
45.86700
Longitude
-110.95400
Notes

A rider reported: "I had just rode up and was on my way down when it broke off right beside me. I was approximately 80 yards to the north of the slide when it broke."

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Hard slab avalanche
Trigger
Snowmobile
Trigger Modifier
u-An unintentional release
R size
2
D size
2
Bed Surface
O - Old snow
Problem Type
Persistent Weak Layer
Slab Thickness
21.6 inches
Vertical Fall
600ft
Slab Width
100.00ft
Weak Layer Grain type
Faceted Crystals
Weak Layer grain size
2.00mm
Weak Layer Hardness
F
Slab Layer Grain Type
Wind packed
Slab Layer Grain Size
0.30mm
Slab Layer Hardness
P
Slab Thickness units
inches
Single / Multiple / Red Flag
Single Avalanche
Advisory Year

Large Collapse near Fairy Lake

Fairy Lake
Bridger Range
Code
SS-ASu-O
Notes

From e-mail: "We went up to Fairy Lake yesterday... to the north facing trees right off of the lake.  The wind has really done a number on the whole area, I haven't seen it like this before.  Anyway we started up and the snow was really weird.  We'd be on top of a hard wind slab and then ten feet later punch through it and be wallowing in sugar up to our knees.... the weirdness continued as we tried working east and west across the face looking for more stable snow.  After we'd climbed about 350 feet above the lake I had a big whoomp and the snow I was on collapsed about a foot, and cracks shot out about 50 feet from me. This was at about 8:30 yesterday morning."

Seperate group, same area: "ECTP 3 on a northwest exposure. Snow depth was about 60 cm where this test was taken. Dug another pit on same aspect with a 120cm base, which fractured at 27 hits, but did not propegate."

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Skier
Trigger Modifier
u-An unintentional release
Bed Surface
O - Old snow
Problem Type
Persistent Weak Layer
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year

Road Cut Collapse in Hyalite

Northern Gallatin
Code
SS-AWu
Latitude
45.47250
Longitude
-110.95000
Notes

"Witnessed this road cut collapse in hyalite today , by the Palisades parking lot. Easily a foot of dense snow on 12-18" of sugar. Audible collapse as my dog climbed the embankment." C. Bieniek

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Wildlife
Trigger Modifier
u-An unintentional release
Problem Type
Persistent Weak Layer
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year

Ross Peak Avalanche

Ross Peak
Bridger Range
Code
HS-N-R2-D2
Aspect
NE
Latitude
45.85800
Longitude
-110.95400
Notes

 This avalanche was on a northeast slope on Ross Peak. The observation reported "very firm thick wind slabs with ground level facets" nearby. Photo: J. Johnson

Number of slides
1
Number caught
0
Number buried
0
Number killed
0
Avalanche Type
Hard slab avalanche
Trigger
Natural trigger
R size
2
D size
2
Problem Type
Wind-Drifted Snow
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year