Richmond crown investigation
Date of Observation: 01/03/2022
Name: Zach Guy
Zone: Northwest Mountains
Route Description: Slate River to Mt. Richmond to check out a deep slab crown.
Observed avalanche activity: Yes
Avalanches: 2 large wind slabs that looked fresh, likely ran sometime over the weekend, along with a number of small ones. Got good views of some of the previously documented slides on Schuykill and in Baxter, along with a few that ran during the storm that we haven’t noted yet. The debris piles below Schuykill Ridge are impressive, and they knocked over several mature trees. The slides off of Richmond and/or Bichmond also knocked over a handful of mature trees.
Weather: Cold, clear, a few short-lived moments of light snow transport from southwest winds.
Snowpack: No signs of instability underfoot or machine on a mix of steep and low angle slopes. Small grained surface hoar is growing at low elevations.
I looked at the crown on the northeast face of Richmond. The crown ranged from 8 to 12 feet thick. It was pencil hard where I could reach it. It failed on a weak layer of 1.5 to 2.0 mm rounding facets (4F+), which was about 40 to 70 cm off of the ground. There was about a foot of snow on the bed surface so it must have run on 12/31.
Photos:
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Fresh looking wind slab on Peeler Peak
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Fresh looking wind slab on Purple Ridge
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Full track deep slab off of East Schuykill
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Deep slab off of Yogis
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Deep slab on Scarp Ridge
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Several crowns near Daisy Pass
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Debris from Mineral Point came within about a 100 yards of Naman’s outhouse
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Several destructive crowns in Baxter Basin
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Crown on Schuykill Peak
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Some larger trees toppled by debris from Richmond or Bichmond slides
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Richmond crown
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Failure layer of Richmond deep slab: 1.5-2.0 mm rounding facets. (4F+)
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Crown was 12 feet thick here.
Avalanche Report #1
Estimated avalanche date: 01/02/2022
Number of Avalanches: 1
Location
Location: Oh-Be-Joyful Basin
Location Specific:
Start Zone Elevation: NTL: Near Tree Line
Aspect: E
Characteristics
Trigger: Natural
Trigger modifier:
Type: Soft Slab
Failure Plane: Within storm 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: Peeler Peak
Avalanche Report #2
Estimated avalanche date: 01/01/2022
Number of Avalanches: 1
Location
Location: Upper Slate (Purple, Yule Pass, Paradise Divide)
Location Specific:
Start Zone Elevation: ATL: Above Tree Line
Aspect: E
Characteristics
Trigger: Natural
Trigger modifier:
Type: Soft Slab
Failure Plane: Within storm 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: Purple Ridge
Avalanche Report #3
Estimated avalanche date: 12/31/2021
Number of Avalanches: 2
Location
Location: Schuylkill Ridge
Location Specific:
Start Zone Elevation: NTL: Near Tree Line
Aspect: NE
Characteristics
Trigger: Natural
Trigger modifier:
Type: Hard Slab
Failure Plane: Old snow
Size
Relative Size: R4 large
Destructive Size: D3 – could destroy a car, wood-frame house, or snap trees
Avg. crown height (inches):
Avg. width (feet):
Avg. vertical run (feet):
Involvements
# of people caught:
# of partial burials:
# of full burials:
Additional comments: Previously undocumented on Schuykill (Yogi’s and Schuylkill Subpeak)
Avalanche Report #4
Estimated avalanche date: 12/31/2021
Number of Avalanches: 4
Location
Location: Poverty Gulch (Pittsburg, Augusta, Baxter Basin)
Location Specific:
Start Zone Elevation: NTL: Near Tree Line
Aspect: N
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: Several small but deep pockets near Daisy Pass / Schuykill Peak. Some of these snapped small trees.
Avalanche Report #5
Estimated avalanche date: 12/31/2021
Number of Avalanches: 2
Location
Location: Poverty Gulch (Pittsburg, Augusta, Baxter Basin)
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: R4 large
Destructive Size: D3.5
Avg. crown height (inches):
Avg. width (feet):
Avg. vertical run (feet):
Involvements
# of people caught:
# of partial burials:
# of full burials:
Additional comments: Martini Bowl and Bichmond
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