Date of Observation: 01/03/2022
Name: Eric Murrow
Zone: Northwest Mountains
Route Description: Washington Gulch TH out to Baldy, ascended and descended south ridge.
Observed avalanche activity: Yes
Avalanches: Phew….lots. In broad terms, many large to very large avalanches near and above treeline on the north half of the compass (many of these avalanches will be documented in another ob tomorrow). Only spotted a single avalanche below treeline on east slope near Purple Palace.
Weather: Clear skies with cold temperatures at valley bottom, but pleasant temps in the 20s near treeline. Light WSW winds with moderate gusts. Observed some continued snow transport around the range.
Snowpack: I largely snowmobiled around checking on snow depths. In the lower reaches of Washington Gulch I found around 175cm and near treeline on Baldy 260cm. I dug a single, deep profile near treeline on a southeast slope that was bare dirt prior to December. Test results indicated reasonable bonding between Santa Storm and the early December snow although the overlying slab is harder than the snow at the ground. There was no melt/freeze crust present in this profile location.
Photos:
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Natural avalanches from Scarp Ridge above Peeler Lakes.
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East below treeline avalanche near Purple Palace. This crown is filled in fairly well with snowfall so I suspect it failed on Thursday or Wednesday last week.
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Test profile from a southeast slope near treeline.
Estimated avalanche date: 12/30/2021
Number of Avalanches: 1
Location
Location: Upper Slate (Purple, Yule Pass, Paradise Divide)
Location Specific:
Start Zone Elevation: BTL: Below Tree Line
Aspect: E
Characteristics
Trigger: Natural
Trigger modifier:
Type:
Failure Plane:
Size
Relative Size: R2 small
Destructive Size: D2 – could bury, injure, or kill a person
Avg. crown height (inches):
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Involvements
# of people caught:
# of partial burials:
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Additional comments: Near Purple Palace…the slope above Slate switchback the gets the glide cracks most years.
Estimated avalanche date: 12/31/2021
Number of Avalanches: 1
Location
Location: Peeler Basin
Location Specific:
Start Zone Elevation: ATL: Above Tree Line
Aspect: N
Characteristics
Trigger: Natural
Trigger modifier:
Type:
Failure Plane:
Size
Relative Size: R1 very small
Destructive Size: D2 – could bury, injure, or kill a person
Avg. crown height (inches):
Avg. width (feet):
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Involvements
# of people caught:
# of partial burials:
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Additional comments: Long view, but only a very small portion of this feature failed. Crown looked fairly sharp so not a whole lot of refill.
Estimated avalanche date: 12/31/2021
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:
Failure Plane:
Size
Relative Size: R2 small
Destructive Size: D2.5
Avg. crown height (inches):
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Involvements
# of people caught:
# of partial burials:
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Additional comments: Crown looked fairly sharp without a lot of refill. Very drifty site, so if it failed early in the week, I suspect it would have been more subdued. Could have been a D3, but I could not see run out or debris.
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Additional comments:
Estimated avalanche date:
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Location
Location:
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# of partial burials:
# of full burials:
Additional comments:
5199