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PROFESSIONAL OBSERVATION FORM
 Start Date: 02.28.19 Name: Savage Operation: SAC
 Drainage/Route:  glassing activity near Ketchum, Sun Valley, and north of town Observed Terrain:  Warm Springs Ck, HWY corridor SNRA Headquarters to Hailey Zone/Region:  Wood River Valley
WEATHER OBSERVATIONS
 HN24: 7cm HST: 100cm? Sky: BKN Precip: Temps: mid 30s F
 Ridgeline Wind: Moderate and Intermittent from the Variable
 Blowing Snow: L Snow Available for Transport: Large amounts
 Comments: Wind was light and then picked up and shifted west around 2:30 PM on the valley floor.
AVALANCHE OBSERVATIONS
 No. Location Date Size Type Trigger Aspect Elevation Comments
 2 Durrance E face Yesterday 2.5 U N E 8800-8900' First 2 main chutes N of first "summit" of Durrance. Unknown size, guessing 2.5 but could be D3 (see photo)
 1 Durrance E face Yesterday 2 U N SE 7200' Triangle feature just climbers right of beginning of approach ridge. ESE aspect. See photo
 1 Durrance E face Yesterday 2 U N E 8600' Concave feature below ridgeline running E from true summit of Durrance, see photo.
 several Griffin Butte Today 1.5 WL N E 7000' Wet loose dribbles, all pretty small (see photo)
 3 Dollar Mountain/Trail Ck Today 1.5 WL N W 6200' WNW aspects running towards Ketchum. Wet loose at top, flanked out to thin, narrow slabs in places, D1.5-2
 2 Dollar Lake/Warm Springs Ck Today 2 SS N SE 8000' 2 persistent slabs, ran 2000' vertical. See photo.
 1 Sun Mt/Lake Ck Within past week 2 U N NW 6800' Thick wind feature but not very wide, see photo.
 Comments: Sun Mt/Lake Ck slide was from earlier in the storm. The other slabs occurred yesterday or this morning, hard to tell for sure. The WL activity was from today.
STABILITY TESTS
 Stability Test Results:
SNOW STABILITY
 Snow Stability Rating for your observed area: Confidence: Trend:
BOTTOM LINE
 Comments: Lots of 2-4 foot thick persistent slab activity at middle elevations at the tail end of the storm. Will be interesting to see what happened up high when we get decent visibility.
FILE ATTACHMENTS

190228_DollarLake_crowns_8000_SE.JPG
Dollar Lake in Warm Springs Ck. 8000', SE.

190228_DollarLake_slides_8000_SE.JPG
Dollar Lake slides showing upper part of the track. They ran 2000' vert to the lake at the valley floor.

190228_SunMountain_LakeCk_windfeature.JPG
Interesting wind feature that broke on Sun Mountain in Lake Ck. NW aspect.

190228_Durrance_7200_ESE_slab.JPG
Durrance slab at beginning of approach ridge, Headquarters Ck, E aspect.

190228_Durrance_8600_E_slab.JPG
Durrance slab farther out the ridge, 8600' E.

190228_Durrance_4slides_overview_arrows.jpg
4 slides on Durrance: 2 D2.5 or D3, 2 D2. One is obvious in foreground, 3 are marked with arrows.