Close

Professional Observation

       

Basic Information

Observation Details

Observation Date:
December 17, 2022
Submitted:
December 18, 2022
Observer:
Everett Phillips | ESAC Forecaster
Zone or Region:
June Lake
Location:
San Joaquin Mountain - Snowpack Observations

Signs of Unstable Snow

Recent Avalanches? 
None Observed
Cracking? 
None Experienced
Collapsing? 
None Experienced

Key Points

Today I went into the June Mountain backcountry for a general snowpack assessment. Here are my takeaways:

  • During the last storm (12/11/22)  many large natural avalanches ran on N and NE aspects, below cliff bands, Near and Above Treeline.
  • Snow depth (HS) is less than in the Mammoth area and it is still possible to hit buried rocks, logs and stumps especially below 9000′.
  • Near and Above Treeline snow depth varies with wind deposition.
  • Surface hoar is widespread on the snow surface below 9000′.

I did not get a chance to evaluate the reactivity of the 12/01 PWL today. I did not find it in the two sites I targeted for snow observations.

 

Media

Less than expected snow cover Above Treeline on San Joaquin ridge except in wind drifts around ridges.
Thin coverage below 9000' in June Lake area.
One of many crown lines from large avalanches during the 12/11/22 storm. N aspect, 9500'

Advanced Information

Weather Summary

Cloud Cover:
Clear
Temperature:
24 F
Wind:
Calm

An inversion made the parking lot at June Mountain very cold in the morning. Once above 9000′ things began to warm-up. Clear skies and light winds made it a nice to be out in the mountains.

Avalanche Observations

 #  Date Location Size Type Bed Sfc Depth Trigger Comments Photo
5 Within the past week June Lake Backcountry and San Joaquin Ridge
N Near Treeline and Above Treeline 		D2 3 ft N-Natural N and NE aspects. Below cliff bands. Up to D 2.5 in size. None
Close