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PROFESSIONAL OBSERVATION FORM
 Start Date: 02.07.19 End Date: 02.07.19
 Drainage/Route:  Quigley Observed Terrain:   Zone/Region:  Wood River Valley
WEATHER OBSERVATIONS
 HN24: HST: Sky: CLR Precip: Temps: brr
 Ridgeline Wind: Calm
 Blowing Snow: Snow Available for Transport: Small amounts
AVALANCHE OBSERVATIONS
 No. Location Date Size Type Trigger Aspect Elevation Comments
 1 Within past week 2.5 HS AS 7900 same as in Preuss obs 02.04
 2 Within past week 1 HS AS N 7700 isolated pocket on other side of bowl from #1, perhaps sympathetic from that event?
SNOWPACK OBSERVATIONS
 HS:  
 Upper Pack: 4F 20-25cm storm snow. hard and soft wind slabs at ridges on NW-N-NE, faceting on mid to low elev 
 Middle Pack: mixed crusts/ FC 
 Lower Pack: N/O 
STABILITY TESTS
 Stability Test Results:
OBVIOUS SIGNS OF INSTABILITY
 Marked with checkmark if observed:
 Collapsing (isolated) Depth: to ground (30-50cm) Length: 5m
 Comments: large wind whale on the ridgeline. likely similar trigger as with older slide in above obs
SNOW STABILITY
 Snow Stability Rating for your observed area: Confidence: Trend:
BOTTOM LINE
 Comments: area of collapse predictable. problems seem manageable i.e avoid whales at ridgelines or crests. comfortably skiied in sub 35 deg terrain.