Cloud cover started as clear to FEW at dawn, becoming overcast (thin) by 10:00, then breaking at 14:00 and finally clear by sunset. Winds were calm to light. Very cold temperatures all day.
Dec 11, 2021
WA Pass Hwy 20
Dec 11, 2021
WA Pass Hwy 20- Liberty Bell paths
Many of the Liberty Bell paths ran (likely Saturday) w debris piles on Hwy 20 size D1-2.5
Surfaces were very low density, cold snow at all elevations. Height of snow near and above treeline was 150-220cm.
Profile at 7300ft, NW
HS 160cm w favorable "right-side-up" hardness profile
Sudden and propagating results (CTM12 SC, ECTP 20) on 0.5-1.0 (minimally) faceted rounded grains above "late Nov" rain crust (buried 12/4) .
Profile At 6580ft, NW
Sudden results (CTM11 SC) on late Nov crust at 90cm.
While we experienced no other signs of instability, the test results caused us to make conservative terrain choices.
Layer Depth/Date: 12/11-12
We were not able to assess wind slabs directly. The alpine terrain where we traveled was blanketed w uncohesive snow. Alpine faces on Kangaroo Ridge and The Needles in Pine Creek are still showing evidence of W wind transport from the weekend. Heard 2nd hand reports of wind-affected snow surfaces in Whistler Bowl nearest to Cutthroat pk.