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Natural Avalanche on Anderson Ridge

Location Name: Mount Lincoln Region: Donner Summit Area Observation Date & Time: Tuesday, February 16, 2021 - 10:00
Location: 39.284233, -120.317345 See map: CalTopo	Is this an Avalanche Observation?: Yes Conditions Alerts: Rapid or Prolonged Warming Rapid or Prolonged Warming›Strong Sunshine Rapid or Prolonged Warming›Warm Temperatures Recent Loading Recent Loading›Blowing Snow

Observation made by: Public

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Observation

Description of Snow, Weather, and Avalanche Conditions:

Viewed from Judah Ridge, several car sized natural cornices released off the Anderson Ridge likely in the past 12 hrs. One triggered a slope release, likely a wind slab with a crown that looked to be 2-3ft deep, 50ft wide, and running approximately 200 vertical feet to the trees below.

Terrain Details

Terrain: elevations:

Above Treeline

Terrain: aspects:

Avalanche Details

Avalanche Type:

Wind Slab

Failure Plane/Weak Layer:

Unknown

Additional number of similar avalanches:

Trigger

Trigger:

Natural

Trigger Modifier:

Cornice Fall Triggered

Terrain

Aspect:

Northeast

Starting Elevation:

above-treeline

Size

Destructive Size:

D1 Relatively harmless to people.

Relative Size:

R2 Small

Avalanche Width (Average width):

50ft.

Avalanche Length (Vertical Run):

200ft.

Weather Details

Elevation of Observation:

7000 - 8000 ft.

Blowing Snow:

None

Wind Speed:

Calm

Sky Cover:

Clear

Precipitation:

None

Air temperature:

Above Freezing

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Natural Avalanche on Anderson Ridge

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Natural Avalanche on Anderson Ridge

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