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Sun Bowl Avalanche

Location Name: 
Sun Bowl
Region: 
Mt. Shasta
Date and time of avalanche (best estimate if unknown): 
Thu, 02/04/2021 - 11:30am
Observation made by: 
Forecaster
Red Flags:
Recent loading by new snow, wind, or rain

Location Map

96067 Mount Shasta , CA
United States
41° 22' 9.3288" N, 122° 12' 54.5832" W
See map: Google Maps
California US

Avalanche Observations

Details

The Everitt Memorial Highway opened on the afternoon of February 4th, 2021. A natural avalanche was observed in Sun Bowl from Bunny Flat. The area has seen new snow and recent wind loading by strong, northerly wind. 

DATA CODE: N-HS-R3-D2

  • 1. Date: Unknown, February 3rd or 4th
  • 2. Time: Unknown
  • 3. Observer: Meyers
  • 4. Path Characteristics: Above treeline
    • a. Observation Location: Bunny Flat
    • b. Aspect: SE-S-SW
    • c. Slope Angle in Starting Zone: Upper 30's
    • d. Elevation: 8600 feet
  • 5. Event Characteristics
    • a. Type: Hard wind slab
    • b. Trigger: Natural
    • c. Size: R3-D2
    • d. Snow Properties - Unknown
      • i. Bed Surface:
      • ii. Weak Layer:
      • iii. Slab:
  • e. Dimensions
    • i. Slab Thickness: Unknown
    • ii. Width: ~1000 feet
    • iii. Vertical Fall: ~700 feet
  • f. Location of Start Zone: Near top of bowl
  • g. Terminus: Base of bowl
  • h. Total Deposit Dimensions: Unknown
  • i. Avalanche Runout Angle: 20

Photos

Characteristics

Avalanche Type: 
Slab
Trigger type: 
Natural
Slope: 
38degrees
Aspect: 
South
Elevation: 
8 600ft.
Terrain: 
Above Treeline
Weak Layer: 
Unknown
Bed Surface: 
Unknown
Crown Height: 
Less than 1 ft
Avalanche Width: 
1 000ft.
Avalanche Length: 
700ft.
Number of people caught: 
0
Number of partial burials: 
0
Number of full burials: 
0

Weather Observations

Details

Recent new snow has been accompanied by strong northwest wind.

Statistics

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