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Avalanche Gulch - Green Butte

Location Name: 
Avalanche Gulch and Green Butte
Mt. Shasta
Date and time of observation: 
Sat, 02/11/2023 - 12:00pm
Observation made by: 
Red Flags:
Recent loading by new snow, wind, or rain

Location Map

96067 Mount Shasta , CA
United States
41° 18' 34.254" N, 122° 6' 5.868" W
California US

Snowpack Observations


Observations from Avalanche Gulch and Green Butte ridge between 9am and 12pm. 

Below treeline, three to four inches of new snow was found over a hard crust underneath. Wind was out of the northeast, strengthening with higher elevation. Visibility was clear with few clouds in the sky. Ski quality was best below treeline.

Near and above treeline, winds quickly became strong, with extreme gusts out of the northeast. Extreme down slope winds made it nearly impossible to travel above treeline. Blowing snow could be seen traveling hundreds of feet into the air all across Mount Shasta. Large sections of icy scoured snow surfaces followed by deep wind drifts could be found in abundance. Many leeward terrain features were visibly wind loaded with 12 - 15 inches of transported snow. Visibility was obscured at times due to blowing snow, with the summit fully obscured at all times. 

Lenticular clouds could be seen developing above Mount Shasta, suggesting strong to extreme winds aloft.

No obvious signs of instability were observed today, however, I suspect any leeward slope near and above treeline to be wind loaded. Eric and I stayed off of any south-west facing avalanche terrain. 

  • Observation Location: Green Butte ridge and Avalanche Gulch
  • Elevation: 8,000 feet
  • Date: 20230211
  • Time: 1200
  • Observer: S. Clairmont
  • Sky Conditions: Scattered (SCT)
  • Current Precipitation: NO
  • Air Temperature: 31 °F
  • Total Snow Depth (HS): 131 in (333 cm)
  • 24-hour New Snow Depth (HN24): 3 in (7 cm)
  • Wind Direction: NE
  • Wind Speed: Strong (S), 26-38 mi/hr, whole trees in motion


  • Skin track filling with snow
  • Extreme gusts obscuring visibility
  • Wind textured snow
  • Wind loaded slope
  • Eric crossing through wind transported snow
  • Snow blowing off Mount Shasta
  • Lenticular clouds

Weather Observations


Cloud Cover: 
25% of the sky covered by clouds
Blowing Snow: 
Accumulation rate: 
Air temperature: 
Below Freezing
Air temperature trend: 
Wind Speed: 
Wind Direction: