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Green Butte - Storm Day

Location Name: 
Green Butte Ridge
Mt. Shasta
Date and time of observation: 
Sat, 03/04/2023 - 1:00pm
Observation made by: 
Red Flags:
Whumphing noises, shooting cracks, or collapsing
Recent loading by new snow, wind, or rain

Location Map

96067 Mount Shasta , CA
United States
41° 22' 5.4156" N, 122° 13' 18.5304" W
California US

Snowpack Observations


Signs of instability were very obvious today. Strong winds, moderate to high snow accumulation rates, cracking, and triggering of storm slab avalanches were all prevalent during today's tour. These red flags were found below, near, and above treeline.

  • Visibility remained poor while on the mountain. Upper Mount Shasta was completely obscured from view above treeline. Orientation became challenging once leaving the trees. The sun made an appearance around 2pm.
  • Snow accumulation rates were around 1 inch per hour. New snow totals varied on aspect and terrain feature. Windward features had three inches, while other areas showed closer to eight inches.
  • Wind remained moderate out of the southeast, with strong gusts near and above treeline. These winds were actively transporting new snow to leeward terrain features. 
  • Numerous storm slab avalanches were intentionally triggered on test slopes with W-S-E aspects. These avalanches slid on the new snow old snow interface. The old snow presented with a firm but punchable surface crust to which the new slow could easily slide.
  • Temperatures remained cold throughout the outing, keeping the snow cold and dry.

  • Observation Location: Green Butte Ridge
  • Elevation: 8,200 feet
  • Date: 20230304
  • Time: 1300
  • Observer: S. Clairmont
  • Sky Conditions: Obscured (X)
  • Current Precipitation: Type - SN, Rate - S2
  • Air Temperature: 15 °F
  • Surface Penetration: Ski penetration (PS) = 6 in (15 cm)
  • Total Snow Depth (HS): 157 in (399 cm)
  • 24-hour New Snow Depth (HN24): 6 in (15 cm)
  • Wind Direction: SE
  • Wind Speed: Moderate (M), 17-25 mi/hr, small trees sway


Weather Observations


Cloud Cover: 
100% of the sky covered by clouds
Blowing Snow: 
Accumulation rate: 
Greater than 1 in. per hour
Air temperature: 
Below Freezing
Air temperature trend: 
Wind Speed: 
Wind Direction: