The last avalanche forecast for the 2023-2024 season will post on April 21st. Thank you to all who contributed to the avalanche center this season through observations, volunteer time, and/or financial contributions.

Obs from Andesite Peak

Location Name: Andesite Peak Region: Donner Summit Area Observation Date & Time: Saturday, December 12, 2020 - 01:45
Location: 39.352419, -120.362649 See map: CalTopo	Is this an Avalanche Observation?: No

Observation made by: Educator at Tahoe Mountain School

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Observation

Description of Snow, Weather, and Avalanche Conditions:

Noteworthy obs from andesite peak tour with AIARE level 1 students:

- Wind + snow had a hard time producing any sort of wind slab in the andesite peak area. We found a couple isolated terrian features near ridge line that held "baby" slabs around 4-5 inches thick, (see picture) also winds shifted to NE mid day + we observed light snow transport to the W/SW aspects near ridgeline.

- CTV(SC) @ 52cm and CT1(SC) @ 52cm were observed in our compression tests today in our snow pits. These failures occured just below the old/new snow interface in the near surface facets the forcasters have been telling us about for a couple weeks now. Our pit location was in a sheltered north-east aspect @ 7450ft. HS 62. The upper snow stucture really poor with 20cm of Fist-hard FCsf.

Very Small Wind slab (NE aspect)

Weather Details

Elevation of Observation:

7000 - 8000 ft.

8000 - 9000 ft.

Blowing Snow:

Light

Wind Direction:

Northeast

Wind Speed:

Moderate

Sky Cover:

Few - Mostly Clear - up to 2/8 covered

Air temperature:

Below Freezing

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