Date of Observation: 03/12/2023
Name: Irwin Guides
Zone: Northwest Mountains
Route Description: Irwin Tenure
Observed avalanche activity: Yes
Avalanches: Several non-destructive D1 storm slabs on W NTL. 50-100′ wide propagation.
Weather: OVC, 27/17 deg, W 10-20 g 30, convective snow showers off and on S1.
Snowpack: Snow became low-density by the end of the storm. Afternoon 2d SWE 6%. W aspects NTL touchy-very touchy nondestructive storm slabs 6-10″ this morning. DL on W & E aspects on terrain >37 deg, mostly surface graupel from today’s snow.
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[accordion_item title=”Avalanche Report #1″ parent_id=”my-accordion” open=”false”]Estimated avalanche date: 03/12/2023
Number of Avalanches: 3
Location
Location: Lake Irwin (Robinson Basin, Owen, Ruby)
Location Specific:
Start Zone Elevation: NTL: Near Tree Line
Aspect: W
Characteristics
Trigger: Skier
Trigger modifier:
Type: Soft Slab
Failure Plane: Within storm snow
Size
Relative Size: R1 very small
Destructive Size: D1- Relatively harmless to people
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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