Date of Observation: 04/11/2023
Name: Zach Guy
Zone: Northwest Mountains
Route Description: Afternoon snowmobile tour to Scarp Ridge, Beaver Ponds TH, and Horse Ranch TH documenting wet avalanche patterns from the last few days.
Observed avalanche activity: Yes
Avalanches: More wet action. In summary, all of the large (D2+) avalanche activity (both wet slab and wet loose) has been happening on east, south, and west aspects, mostly near and below treeline, where meltwater is most intense right now. I saw a few wet slabs break near 12,000′ into above treeline type of terrain. These were all on rocky, shallow slopes facing SE. There’s still plenty of wet loose activity happening on NE and NW aspects but it’s still shallow and not gouging like the southern side is, and no wet slabs on the northern half of the compass thus far.
Weather: Hot.
Snowpack: A quick handpit on a 30 degree, SE facing slope at 12,000 feet this afternoon had wet snow about 6″ deep and moistening snow below that. The snowpack was generally supportive to sledding near and above treeline with track pen about 6″. It was trapdoor in a few low-elevation areas.
Photos:
-
-
AMR east bowl
-
-
The exit basin below Playground at Anthracites
-
-
Near Ohio Peak
-
-
South side of Playground
-
-
South side of Playground
-
-
West side of Mt. Owen.
Estimated avalanche date: 04/11/2023
Number of Avalanches: 3
Location
Location: Anthracite Range
Location Specific:
Start Zone Elevation: BTL: Below Tree Line
Aspect: E
Characteristics
Trigger: Natural
Trigger modifier:
Type: Wet Loose
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: Near East Bowl. Likely ran 4/11 or 4/10
Estimated avalanche date: 04/11/2023
Number of Avalanches: 7
Location
Location: Anthracite Range
Location Specific:
Start Zone Elevation: BTL: Below Tree Line
Aspect: SE
Characteristics
Trigger: Natural
Trigger modifier:
Type: Wet Loose
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: Playground egress near Ohio Pass, and south side of Playground. Likely ran 4/11 or 4/10
Estimated avalanche date: 04/11/2023
Number of Avalanches: 2
Location
Location: Anthracite Range
Location Specific:
Start Zone Elevation: ATL: Above Tree Line
Aspect: SE
Characteristics
Trigger: Natural
Trigger modifier:
Type: Wet 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: Near Ohio Peak, Near to Above treeline. Failure date estimated.
Estimated avalanche date: 04/11/2023
Number of Avalanches: 1
Location
Location: Anthracite Range
Location Specific:
Start Zone Elevation: NTL: Near Tree Line
Aspect: SE
Characteristics
Trigger: Natural
Trigger modifier:
Type: Soft 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: South side of Playground. Failure date estimated.
Estimated avalanche date: 04/10/2023
Number of Avalanches: 1
Location
Location: Anthracite Creek (West side of Ruby Range, Marcellina)
Location Specific:
Start Zone Elevation: NTL: Near Tree Line
Aspect: SW
Characteristics
Trigger: Natural
Trigger modifier:
Type: Wet 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: Below Owen.
6225