Date of Observation: 01/02/2022
Name: Zach Guy
Zone: Northwest Mountains
Route Description: Ruby Range
Observed avalanche activity: Yes
Avalanches: Numerous destructive avalanches from 12/31 cycle, generally D3 to D4, mostly on east to north aspects. Some of these were previously documented and coded on Jan 1, but I’m adding better photos to this ob. Plenty of evidence of smaller or older undocumented slides.
Photos:
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Owen East face
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Afley/Purple Saddle
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Oh-Be-Joyful NE to E face. Crown is filled in enough that this slide probably ran earlier in the cycle.
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Hancock
Estimated avalanche date: 12/31/2021
Number of Avalanches: 1
Location
Location: Lake Irwin (Robinson Basin, Owen, Ruby)
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: Mount Owen east face
Estimated avalanche date: 12/31/2021
Number of Avalanches: 1
Location
Location: Oh-Be-Joyful 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: R3 medium
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: Afley/Purple saddle
Estimated avalanche date: 12/28/2021
Number of Avalanches: 1
Location
Location: Oh-Be-Joyful 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: 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: Oh-Be-Joyful NE to E face. Crown is fairly filled in so likely ran a couple days prior to 12/31 cycle?
Estimated avalanche date:
Number of Avalanches:
Location
Location:
Location Specific:
Start Zone Elevation:
Aspect:
Characteristics
Trigger:
Trigger modifier:
Type:
Failure Plane:
Size
Relative Size:
Destructive Size:
Avg. crown height (inches):
Avg. width (feet):
Avg. vertical run (feet):
Involvements
# of people caught:
# of partial burials:
# of full burials:
Additional comments:
Estimated avalanche date:
Number of Avalanches:
Location
Location:
Location Specific:
Start Zone Elevation:
Aspect:
Characteristics
Trigger:
Trigger modifier:
Type:
Failure Plane:
Size
Relative Size:
Destructive Size:
Avg. crown height (inches):
Avg. width (feet):
Avg. vertical run (feet):
Involvements
# of people caught:
# of partial burials:
# of full burials:
Additional comments:
5202
