Avalanche

Mammoth Area And Highway Avy Obs

Clancy NelsonEastside Region
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Observation photo 1Observation photo 2Observation photo 3Observation photo 4Observation photo 5Observation photo 6Observation photo 7

Quick report

Small rollerballs on test slopes midday.

Weather

Air Temp
55
Cloud Cover
broken
Wind Loading
none
Rain Elevation
NA
Recent Snowfall
0
Snow Avail For Transport
none

Mostly cloudy and warm. Light to moderate southwest winds near and above treeline.

Snowpack

I dug to the ground on a northwest-facing, near treeline slope to see if there were any more weak layers to get wet. While the snowpack on most other aspects is getting shallow (HS = 0-165 cm across a south aspect on the other side of the ridge), on north aspects near treeline and above the pack was deep, hard, and wet. I did find the depth hoar that was buried on Christmas Eve, way down near the ground. It was very wet and had a crust on top so hard that I could barely push my shovel through it.

All aspects had wet surface snow that was mostly supportable. We found isolated areas, especially near radiators like trees, where we had boot-top ski penetration into wet snow.

Mammoth is truly the exception when it comes to coverage below treeline. However, even in that area, things are melting out fast.

Avalanche

Size
D2
Type
U
Count
2
Aspect
NE
Trigger
N
Elevation
12000 ft

Debris pile from a new large avalanche near the top of the middle Tungstar Bowl in Pine Creek. 12,000 ft. Northeast. Above treeline.