Recreational Observation

Snoqualmie Pass

Feb. 23, 2018, 12:54 p.m. PST

Weather: Overcast with snow flurries. Temperature below freezing, but not measured.

Snowpack: Test pit to confirm persistent weak layer / persistent slab problem stated in the forecast, and assess its likelihood to be triggered on the Patrol Race route. Test pit: East aspect, 4400' elevation. 25° slope, on the skier's left edge of a recognizable historic slide path. Crust identified 90-95 cm down. Compression test #1: CTM18 40cm down, resistant planar on facets. Column topped off 10cm below this failure to continue taps for an unofficial Deep Tap Test - DTH21 90cm down, sudden planar on facets. Compression test #2: CTH24, simultaneous failures 40cm down, resistant planar on facets and 90cm down, sudden planar on facets. Extended Column Test: ECTN18 40cm down. Taps continued to 30 without causing the persistent slab problem to fail. Propagation Saw Test: PST 35x100 (End) down 90cm on 5 Feb crust. No further tests or observations taken due to time limitations.

Area Description: While route-setting for the Mountaineer's Patrol Race on Saturday, we intentionally stopped for this test pit observation at the largest slide path on Silver Peak's East Face, where the Pacific Crest Trail enters the path. This slide path is the left-most on the maps.

Observation by Chris Simmons

Did you see any avalanches? No

Did you trigger any avalanches? No

Was anyone caught in an Avalanche? No