Date of Observation: 03/06/2023
Name: Eric Murrow
Zone: Northwest Mountains
Route Description: Washington Gulch to Baldy Mountain and lap on Coneys at the end of the day.
Observed avalanche activity: Yes
Avalanches: I observed a couple of older Wind Slab debris piles with blown-over crowns on southeast aspect in Baldy’s Rock Creek Bowl and a northwest pocket on Gothic Mountain. Fresh cornice-fall triggered slabs created large avalanches in Peeler Basin (different from the other reported slide) and north aspect of Schuylkill Peak into Baxter Basin.
Weather: Relentless SW winds around 30-40 mph in the alpine with gusts over 60 mph. Temps at low elevations out of the wind felt a bit above freezing and wet snow surfaces on sunny slopes.
Snowpack: We went hunting for recent hard slabs formed by the wind and did not encounter signs of instability on stiff, supportive-to-ski, drifts on northeast, east, and southeast aspects at different elevations. We ski-cut and skied several smaller slopes with obvious hard slabs up to 12″ thick without result. Recent Wind Slabs in this area appear to be stubborn or unreactive now. Minor drifting was observed throughout the day but did appear to produce any significant loading.
Photos:
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Cornice-fall triggerd avalanche on Schuylkill Peak’s north side. The actual crown is fairly deep but not very wide and it did not propagate as it ran into Baxter Basin.
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Cornice-fall triggered avalanche in Peeler Basin. It appears the portion that broke deeply was only on the unsupported slope above the cliff band.
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Looking at the scoured westerly slopes of the Elk Mountains. Castle Peak is the tallest in the center of the image.
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Looking at the westerly slopes of Avery (foreground) and White Rock (background).
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The slopes on the right side of the image face west/southwest and are hammered/scoured by the recent windy period.
Estimated avalanche date: 03/05/2023
Number of Avalanches: 1
Location
Location: Peeler Basin
Location Specific:
Start Zone Elevation: ATL: Above Tree Line
Aspect: NE
Characteristics
Trigger: Natural
Trigger modifier:
Type: Hard Slab
Failure Plane: Old snow
Size
Relative Size: R2 small
Destructive Size: D2.5
Avg. crown height (inches):
Avg. width (feet):
Avg. vertical run (feet):
Involvements
# of people caught:
# of partial burials:
# of full burials:
Additional comments: Cornice-fall trigger off Scarp Ridge
Estimated avalanche date: 03/05/2023
Number of Avalanches: 1
Location
Location: Poverty Gulch (Pittsburg, Augusta, Baxter Basin)
Location Specific:
Start Zone Elevation: ATL: Above Tree Line
Aspect: N
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: Cornice-fall triggered
Estimated avalanche date: 03/03/2023
Number of Avalanches: 1
Location
Location: Gothic Mountain
Location Specific:
Start Zone Elevation: NTL: Near Tree Line
Aspect: NW
Characteristics
Trigger: Natural
Trigger modifier:
Type: Soft Slab
Failure Plane: New/Old interface
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: NW portion of west path facing Elkton. Looked old enough that it might have ran 3/3 or 3/4
Estimated avalanche date: 03/03/2023
Number of Avalanches: 1
Location
Location: Mount Baldy
Location Specific:
Start Zone Elevation: ATL: Above Tree Line
Aspect: SE
Characteristics
Trigger: Natural
Trigger modifier:
Type: Soft Slab
Failure Plane: New/Old interface
Size
Relative Size: R1 very small
Destructive Size: D1.5
Avg. crown height (inches):
Avg. width (feet):
Avg. vertical run (feet):
Involvements
# of people caught:
# of partial burials:
# of full burials:
Additional comments: Crown blow over and debris buffed out so I suspect it ran 3/3 or 3/4.
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