Date of Observation: 03/02/2023
Name: Zach Guy
Zone: Southeast Mountains
Route Description: West Elk Air flight covering most of the forecast zone. This ob highlights activity in the Southeast Mountains.
Observed avalanche activity: Yes
Avalanches: The Tuesday/Wednesday storm produced numerous wind slab avalanches, D1.5 to D2, see photos. Most of these appeared to run on Tuesday as well as a handful on Wednesday. The last pulse of the storm on Wednesday also produced many small loose avalanches and a handful of thin storm slabs involving just Wednesday’s storm snow. I spotted two fresh persistent slab avalanches that failed on old weak layers, one was a wind slab that stepped down a few feet on an east facing, windloaded ATL slope near Coffee Pot Pass, in the Southeast Mountains. The other was on a steep, shallow east facing slope near treeline on East Beckwith in the Northwest Mountains. That slope has slab avalanched at least twice this year, so it has an unusually shallow snowpack.
Weather: Clear skies, no wind drifting this morning except on White Rock Mtn.
Photos:
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Persistent slab near Coffee Pot Pass
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Wind slabs on Gothic
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Wind slabs on Gothic
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Wind Slab, Upper West Brush Creek
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Wind Slab, Upper West Brush Creek
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Avery Peak (I think?)
Estimated avalanche date: 03/01/2023
Number of Avalanches: 1
Location
Location: West Brush Creek
Location Specific:
Start Zone Elevation: ATL: Above Tree Line
Aspect: E
Characteristics
Trigger: Natural
Trigger modifier:
Type: Hard Slab
Failure Plane: Old snow
Size
Relative Size: R2 small
Destructive Size: D2 – could bury, injure, or kill a person
Avg. crown height (inches):
Avg. width (feet):
Avg. vertical run (feet):
Involvements
# of people caught:
# of partial burials:
# of full burials:
Additional comments: Peak 13010 near Coffee Pot Pass. Wind slab stepped down into an older mid-pack layer.
Estimated avalanche date: 03/01/2023
Number of Avalanches: 2
Location
Location: Gothic Mountain
Location Specific:
Start Zone Elevation: ATL: Above Tree Line
Aspect: E
Characteristics
Trigger: Natural
Trigger modifier:
Type: Soft Slab
Failure Plane:
Size
Relative Size: R2 small
Destructive Size: D2 – could bury, injure, or kill a person
Avg. crown height (inches):
Avg. width (feet):
Avg. vertical run (feet):
Involvements
# of people caught:
# of partial burials:
# of full burials:
Additional comments: East face x1 and north subpeak x1
Estimated avalanche date: 03/01/2023
Number of Avalanches: 2
Location
Location: Gothic Mountain
Location Specific:
Start Zone Elevation: ATL: Above Tree Line
Aspect: SE
Characteristics
Trigger: Natural
Trigger modifier:
Type: Soft Slab
Failure Plane:
Size
Relative Size: R2 small
Destructive Size: D2 – could bury, injure, or kill a person
Avg. crown height (inches):
Avg. width (feet):
Avg. vertical run (feet):
Involvements
# of people caught:
# of partial burials:
# of full burials:
Additional comments: East face x 1 (mid storm layer, maybe just a D1.5) and north subpeak x 1 (mid storm layer that stepped down to thicker wind slab)
Estimated avalanche date: 02/28/2023
Number of Avalanches: 1
Location
Location: West Brush Creek
Location Specific:
Start Zone Elevation: ATL: Above Tree Line
Aspect: SE
Characteristics
Trigger: Natural
Trigger modifier:
Type: Soft Slab
Failure Plane:
Size
Relative Size: R2 small
Destructive Size: D2 – could bury, injure, or kill a person
Avg. crown height (inches):
Avg. width (feet):
Avg. vertical run (feet):
Involvements
# of people caught:
# of partial burials:
# of full burials:
Additional comments: Near Coffee Pot Pass
Estimated avalanche date: 02/28/2023
Number of Avalanches: 2
Location
Location: West Brush Creek
Location Specific:
Start Zone Elevation: ATL: Above Tree Line
Aspect: S
Characteristics
Trigger: Natural
Trigger modifier:
Type: Soft Slab
Failure Plane:
Size
Relative Size: R2 small
Destructive Size: D2 – could bury, injure, or kill a person
Avg. crown height (inches):
Avg. width (feet):
Avg. vertical run (feet):
Involvements
# of people caught:
# of partial burials:
# of full burials:
Additional comments: Near White Rock x1 and Avery Peak x1
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