Pittsburg storm obs and natural avalanches

10webCBAC Observations

Date of Observation: 12/06/2022
Name: Eric Murrow

Zone: Northwest Mountains
Route Description: Slate River Road to Pittsburg Rollers

Observed avalanche activity: Yes
Avalanches: Observed a few natural avalanches. One slab in the storm snow on an east slope and a couple of slabs failed in weak snow at the ground on northeast slopes near and below treeline. A few small loose avalanches on a variety of aspects as the new snow was low-density and “sluffy”.
Weather: Around 14 inches of low-density snow at 1230pm at 10,4000 feet. Snowfall rates of 2″/hour during the morning. Light winds below treeline.
Snowpack: Recreational pow ski day. Snow depth is around 115cm on shaded aspects below treeline. The slab over the early season facets continues to gain strength (1 finger hardness and supportive to boots) and has made for fewer signs of instability underfoot; we often had to hop once while off the skin track to produce a loud, rumbling collapse.

Photos:

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AMR storm snow

10webCBAC Observations

Date of Observation: 12/06/2022
Name: Mark Robbins

Zone: Northwest Mountains
Route Description: AMR standard skinner

Observed avalanche activity: Yes
Avalanches: New loose dries by east bowl, ski cut storm snow sluff in amr tenure
Weather: Confirmed 6 inches new at base of anthracites. 4 more inches were on the sleds when we returned 4 hours later. Calm winds
Snowpack: Ski cut produced slow moving storm snow sluff which ran 1/3 or so of the slope, see photo. One small settlement descending the skinner trees down low.

Photos:

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Whetstone M Face Bowl Natural

10webCBAC Observations

Date of Observation: 12/05/2022
Name: Turner Petersen

Zone: Southeast Mountains
Route Description: Old crown seen from highway.

Observed avalanche activity: Yes
Avalanches: East facing above tree line. Large natural likely failing on ground.
Weather: Stormy

Photos:

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Graupel shred

10webCBAC Observations

Date of Observation: 12/05/2022
Name: Mark Robbins

Zone: Northwest Mountains
Route Description: Pittsburgh rollers main skinner and rollers

Observed avalanche activity: Yes
Avalanches: Didn’t see as previously reported but maybe I missed it, guessing from 11/29 or 12/2 storm, natural or triggered from below on skinner?
Weather: Spitting Graupel snow for the first lap and windy, then clearing and calming
Snowpack: 2 very small settlements, guessing lots had already collapsed from weekend tourers. A couple inches of new Graupel snow from overnight

Photos:

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