Close
PROFESSIONAL OBSERVATION FORM
 Start Date: 02.02.19 Name: Lundy Operation: SAC
 Drainage/Route:  Spring Creek Observed Terrain:  7100-9500', SW-W-NW Zone/Region:  Smoky & Boulder Mountains
WEATHER OBSERVATIONS
 HN24: 2-3 HST: Sky: X Precip: S-1 Temps:
 Ridgeline Wind: Moderate and Intermittent from the S
 Blowing Snow: None Snow Available for Transport: Small amounts
 Comments: S-1 on and off beginning around 12pm, with an increase in precip to S1 around 4pm. Driving over Galena at 5pm, seemed like less than 5cm HN. Less precip on the Sawtooth Valley side, and mountains were less socked in.
AVALANCHE OBSERVATIONS
None Reported
SNOWPACK OBSERVATIONS
 HS: 70-100cm. Specifics below from a pit at 9500', WSW, 28* slope 
 Upper Pack: Variable - crusts, FCsf, hard slab, sastrugi 
 Middle Pack: down low and in shallower areas in the trees, the midpack was nonexistent and ski pen was to the ground. In open terrain the midpack was generally supportable and 1F hard where I dug. 
 Lower Pack: 20cm of 4F FC above 20cm of F DH - this was the weakest, most intact basal weak layer I've seen in a long time 
AVALANCHE PROBLEM ASSESSMENT
Avalanche Characteristics
Character/Avalanche Problem:
Persistent Slab

Layer/Depth:
12/11, 70cm

Likelihood of Triggering
Sensitivity:
Stubborn

Spatial Distribution:
Widespread
Terrain
  Primary Concern Comments: 
STABILITY TESTS
 Stability Test Results: 9500', WSW, 28*: HS 95cm, 70cm 1F hard slab over F DH, ECTP25, CPST 35/100end, PST 40/100end. Both PST and CPST slid off into the pit
SNOW STABILITY
 Snow Stability Rating for your observed area: Confidence: Trend:
BOTTOM LINE
 Comments: Today was a good reminder that weak snow remains in certain portions of even the upper Wood River Valley. The snowpack I saw today will struggle under much additional loading.
FILE ATTACHMENTS

190202_spring_cr_ECTP_labeled.jpeg
ECTP25 on basal depth hoar

190202_spring_cr_PST.jpg
PST sliding and falling on me