Date of Observation: 01/12/2023
Name: Zach Kinler
Zone: Northwest Mountains
Route Description: Washington Gulch past Elkton and then up lookers left ridge of South Bowl. Quick tour up to Elkton knob upon return.
Observed avalanche activity: Yes
Avalanches: A handful of avalanches in the NW mountains on SE-E-NE aspects near and above treeline. These were all wind slabs formed over the previous 2 days and generally D1.5 with a couple D2s. No fresh persistent slabs were seen in the deeper snowpack. Observed 2 large slides on the West side of Gothic that looked to have started as wind slabs and then stepped down deeper in the snowpack.
Weather: Cold in the valley, quite pleasant once above 10,000′ especially in the abundant sunshine. Winds were calm below treeline and light near treeline. Occasional Moderate winds were observed moving snow on a few of the highest peaks in the range.
Snowpack: Travelling mainly on Southerly aspects from 10,800-12,100′ snowpack depth was generally between 150-180 cm deep on the uniform, planar slopes. Certain features were much shallower and some deeper. There was about 45 cm of settled snow from the 1/10-1/11 cycle. The upper few inches of snow on steeper southerlies was moist. Other than 2 small collapses on drifted SE features I observed no cracking or collapsing elsewhere. A profile on a SSW aspect near treeline produced an ECTP23 on 1-1.5mm facets near the ground(4 finger minus hardness). The slab here was just over 100 cm thick with the bottom few centimeters being Pencil hard.
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Wind slabs, East aspect of the Ruby Range
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Wind slab near treeline, NE aspect
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A couple more wind slabs on NE aspects of the Ruby Range.
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Large avalanche on a NW aspect of Gothic, that may have started as a smaller wind slab.
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Large avalanche on a SW aspect of Gothic Mt. Looks to have started as a smaller wind slab.
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Moderate winds moving snow on the highest peaks.
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Estimated avalanche date: 01/11/2023
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: Hard Slab
Failure Plane:
Size
Relative Size:
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:
Estimated avalanche date: 01/11/2023
Number of Avalanches: 1
Location
Location: Gothic Mountain
Location Specific:
Start Zone Elevation: ATL: Above Tree Line
Aspect: SW
Characteristics
Trigger: Natural
Trigger modifier:
Type: Hard Slab
Failure Plane:
Size
Relative Size:
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: Wind slab that looks to have stepped down
Estimated avalanche date: 01/11/2023
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: Soft Slab
Failure Plane:
Size
Relative Size:
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: Wind slabs
Estimated avalanche date: 01/11/2023
Number of Avalanches: 2
Location
Location: Upper Slate (Purple, Yule Pass, Paradise Divide)
Location Specific:
Start Zone Elevation: ATL: Above Tree Line
Aspect: NE
Characteristics
Trigger: Natural
Trigger modifier:
Type:
Failure Plane:
Size
Relative Size:
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:
Estimated avalanche date: 01/11/2023
Number of Avalanches: 1
Location
Location: Upper Slate (Purple, Yule Pass, Paradise Divide)
Location Specific:
Start Zone Elevation: NTL: Near Tree Line
Aspect: E
Characteristics
Trigger: Natural
Trigger modifier:
Type: Soft Slab
Failure Plane:
Size
Relative Size:
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:
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