Hard Slab Avalanche

Location Name:

Avalanche Gulch

Region:

Mt. Shasta

Date and time of avalanche (best estimate if unknown):

Mon, 12/20/2021 - 11:30am

Observation made by:

Public

Red Flags:

Recent avalanche activity

Recent loading by new snow, wind, or rain

Location Map

96067 Mount Shasta , CA

United States

41° 22' 14.0232" N, 122° 13' 7.5468" W

See map: Google Maps

California US

Avalanche Observations

Details

Public avalanche observation submitted on 12/23/21, avalanche observed on 12/20/21.

Hard slab avalanche observed in Avalanche Gulch, above treeline, off Green Butte Ridge, west side, 8,500 feet.

DATA CODE: HS-N-D2-R2

1. Date: 12-20-21
2. Time: 1130 hrs
3. Observer: Matt Hill
4. Path Characteristics: Above treeline
- a. Observation Location: Avalanche Gulch, Mt Shasta
- b. Aspect: West
- c. Slope Angle in Starting Zone: 35
- d. Elevation: 8,500 feet
5. Event Characteristics
- a. Type: Hard slab
- b. Trigger: Natural
- c. Size: D2/R2
- d. Snow Properties
  - i. Bed Surface: n/a
  - ii. Weak Layer: n/a
  - iii. Slab: n/a
e. Dimensions
- i. Slab Thickness: ~1 foot
- ii. Width: 300 feet
- iii. Vertical Fall: 250 feet
f. Location of Start Zone: Green Butte Ridgeline
g. Terminus: Avalanche Gulch proper
h. Total Deposit Dimensions: n/a
i. Avalanche Runout Angle: n/a

Photos

Characteristics

Avalanche Type:

Slab

Trigger type:

Natural

Slope:

35degrees

Aspect:

West

Elevation:

8 500ft.

Terrain:

Above Treeline

Weak Layer:

Unknown

Bed Surface:

Unknown

Crown Height:

1 ft

Avalanche Width:

300ft.

Avalanche Length:

250ft.

Number of people caught:

Number of partial burials:

Number of full burials:

Weather Observations

Statistics

Cloud Cover:

75% of the sky covered by clouds

Precipitation:

None

Air temperature:

Below Freezing

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