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Castle Lake - Test Profile, Old Avalanches, General Conditions

Location Name: 
Castle Lake
Region: 
Castle Lake
Date and time of observation: 
Mon, 02/18/2019 - 1:30pm
Observation made by: 
Professional Observer

Location Map

96067 Mount Shasta , CA
United States
41° 13' 19.9776" N, 122° 23' 20.3388" W
California US

Snowpack Observations

Details

Observations around Castle Lake:

  • Height of storm snow (HST): 30 cm (12 in), snow light and dry, sitting atop thick rain crust from 2/13.
  • Height of snow (HS): 300 cm
  • Ridges and open areas are wind textured and scoured. Several slopes over 35 degrees are old bed surfaces littered with cornice and avalanche debris.
  • Treed areas and aspects protected from the wind are holding the best snow.
  • Evidence of old avalanches and cornice breaks exist on Right Peak and Upper and Lower Middle Peak (see images).
  • A D1.5 skier triggered avalanche occurred on a west facing aspect. Hard wind slab broke sympathetically to a less steep slope. It fractured just above an ice layer at a convexity. Slope angle was near 35 degrees. See observation for details.
  • Test profile indicated strong temperature gradient across rain crust from 2/13/19 and newer light snow. Minor faceting has occurred in snowpack. No notable column tests results.

Photos

Weather Observations

Statistics

Cloud Cover: 
Clear
Blowing Snow: 
Yes
Precipitation: 
None
Accumulation rate: 
None
Air temperature: 
Below Freezing
Air temperature trend: 
Static
Wind Speed: 
Moderate
Wind Direction: 
Northeast