| Recent Avalanches? | No |
| Collapsing (Whumphing)? | Yes |
| Cracking (Shooting cracks)? | No |
Observation: Turnagain
Location: Sunnyside; Warmup Bowl and Main Bowl
Standard uptrack, then along the ridge to Warm Up bowl; then two laps in Main bowl.
Obvious signs of instability
Observer Comments
Collapsing along the ridge above Warm Up Bowl; hand pits failing on isolation in this location, with slabs up to 15" thick.
Glide crack observed over Warm Up Bowl, on a SE aspect. (See photo below).
Weather
Broken skies, light variable winds, temps in the 20s
Snow surface
Highly variable surface above treeline on the road facing aspect, including wind scoured areas and shallow windslabs on cross loaded features (see photo below). Additionally, some areas on road aspects and along the ridge top featured a very thin crust on the surface, along with some rimed grains... it appeared to have formed after last week's snow, up to 2200'. Maybe some warm air from the valley got pushed up, or the storm ended with a little rain? The crust seemed odd given nearby weather station data.
In main bowl, 4-6" of new snow - generally upside down - sat over facets.
Snowpack
Pit data from a slightly wind loaded area of main bowl:
2700', NW aspect, 15 degree slope, HS=140cm
CT4 PC, CT5 PC down 20cm on the facet/surface hoar interface buried last week.
ECTP1, but the propagation barely made it across the entire block in the test.
Road aspect of Seattle Ridge, looking towards Turnagain Arm
Glide crack observed on a SE aspect over Warm Up bowl
Pit mentioned above. Failure was on the facet/surface hoar interface, which is the second line from the top. The third line is the Nov 16 surface hoar, which wasn't reactive in the tests.