| Recent Avalanches? | Yes |
| Collapsing (Whumphing)? | No |
| Cracking (Shooting cracks)? | No |
Observation: Turnagain
Location: Seattle Ridge / Main Bowl / Repeat Offender
Toured to 2800′, looked over into Main Bowl and Zero Bowl. Descended Repeat Offender.
Obvious signs of instability
Observer Comments
Recent snowmachine triggered D1 wind slab lookers right of the uptrack. Recent looking D1 windslab in Zero Bowl below cornice. (See photos). Wet-loose avalanches and rollerballs seen on steep southerly aspects in the afternoon.
Weather
~2" new snow from last night, sunny, clear skies. Calm to light wind from the N-NW. Temperatures in the 20's F.
Snow surface
~2" new snow from last night. A melt-freeze crust is forming on solar aspects, more pronounced on steep slopes. Below the new snow and melt-freeze crust sits a widespread layer of 1F-4F wind slab, ranging from 6-12".
Snowpack
The 1F-4F wind slab near the surface was failing with easy to moderate force in hand pits on intact stellars. The snowpack on East and North aspects of Seattle Ridge is thin - probing along the uptrack revealed HS=55-80 cm. The deepest snow found was 135cm deep.
Dug two pits:
Pit 1: Main Bowl. 2815', NE aspect. HS=115 cm, but depths of 65-70 cm were found across the area. Found a 30cm 4F wind slab sitting on a 2" m/f crust over facets, then impenetrable crusts below. Did not dig below the hardest crusts. ECTN12 down 30cm above the 2" m/f crust.
Pit2: Repeat Offender. 2785', SE aspect. HS=135. Similar structure to Pit 1, but wind slab was 50cm deep. CT11, ECTN11 down 20cm on wind slab density change. CT14, ECTX down 50 cm on facets below m/f crust.
Snowmachine triggered D1 wind slab lookers right of the uptrack.
Wide angle view of snowmachine triggered D1 wind slab from DOT lot. Slide is in the gully lookers right.
Crown of D1 wind slab in Zero Bowl.
Antitracks and sastrugi on windward aspects.
Signs of recent northerly winds in Main Bowl.
Repeat Offender had many skis tracks on Tuesday, which are now filled in by new snow and wind Wednesday night.
Wet-loose avalanches and roller balls on steep southerly aspects seen in the afternoon.
2" of new snow from Wednesday night sitting on firm wind slab.