Date of Observation: 01/12/2022
Name: Zach Guy and Evan Ross
Zone: Northwest Mountains
Route Description: Upper Yule Creek
Observed avalanche activity: Yes
Avalanches: Documenting more activity from 12/31 cycle that we missed from the flight
Location: Upper Slate (Purple, Yule Pass, Paradise Divide)
Location Specific:
Start Zone Elevation: ATL: Above Tree Line
Aspect: W
Trigger: Natural
Trigger modifier:
Type: Hard Slab
Failure Plane: Old snow
Relative Size: R3 medium
Destructive Size: D2.5
Avg. crown height (inches):
Avg. width (feet):
Avg. vertical run (feet):
# of people caught:
# of partial burials:
# of full burials:
Additional comments: WSW aspect of Treasury
Location: Upper Slate (Purple, Yule Pass, Paradise Divide)
Location Specific:
Start Zone Elevation: ATL: Above Tree Line
Aspect: NW
Trigger: Natural
Trigger modifier:
Type: Hard Slab
Failure Plane: Old snow
Relative Size: R3 medium
Destructive Size: D2 – could bury, injure, or kill a person
Avg. crown height (inches):
Avg. width (feet):
Avg. vertical run (feet):
# of people caught:
# of partial burials:
# of full burials:
Additional comments: NW side of Purple
Location: Upper Slate (Purple, Yule Pass, Paradise Divide)
Location Specific:
Start Zone Elevation: ATL: Above Tree Line
Aspect: N
Trigger: Natural
Trigger modifier:
Type: Hard Slab
Failure Plane: Old snow
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):
# of people caught:
# of partial burials:
# of full burials:
Additional comments: North face of Blob below cliffs. May have been a sympathetic release with the main Blob bowl?
Location: Upper Slate (Purple, Yule Pass, Paradise Divide)
Location Specific:
Start Zone Elevation: ATL: Above Tree Line
Aspect: N
Trigger: Natural
Trigger modifier:
Type: Hard Slab
Failure Plane: Old snow
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):
# of people caught:
# of partial burials:
# of full burials:
Additional comments: Sub peak west of Purple. May have been a sympathetic release with the main Blob bowl?
Location: Upper Slate (Purple, Yule Pass, Paradise Divide)
Location Specific:
Start Zone Elevation: ATL: Above Tree Line
Aspect: E
Trigger: Natural
Trigger modifier:
Type: Hard Slab
Failure Plane: Old snow
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):
# of people caught:
# of partial burials:
# of full burials:
Additional comments: ESE aspect, SW Ridge of Treasury.
