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ADVANCED OBSERVATION FORM
 Start Date: 01.21.19 End Date: 01.21.19
 Drainage/Route:  Iron Creek/9445 Observed Terrain:  E/NE Zone/Region:  Sawtooth Mountains
WEATHER OBSERVATIONS
 HN24: HST: Sky: Precip: Temps:
 Ridgeline Wind: Moderate from the N
 Blowing Snow: M Snow Available for Transport: Large amounts
 Comments: Calm winds until 1pm and winds picked up from the North. SCT sky and cold temps. My hands and feet say temps were in the teens.
AVALANCHE OBSERVATIONS
 No. Location Date Size Type Trigger Aspect Elevation Comments
  9445 Today 2.5 HS ASr NE 9024 Remote trigger as we skinned up on east aspect. We We had a sonic whumpf skinning up the east aspect. It was too dangerous to get out into the crown but we measured 100cm to 135cm crown depth that initiated on the crust above the DH but then stepped down to the ground. Spooky! Photos aren’t great.
AVALANCHE PROBLEM ASSESSMENT
Avalanche Characteristics
Character/Avalanche Problem:
Persistent Slab

Layer/Depth:


Likelihood of Triggering
Sensitivity:
Touchy

Spatial Distribution:
Widespread
Where did you find this problem?
  Primary Concern Comments: We only observed N, NE and E aspects. Winds picked up developing slabs on wind affected east aspects.
 Comments: Probing skinning up had HS depths ranging between 110-170 cm. Obvious density breaks during the past storm cycle.
STABILITY TESTS
 Stability Test Results: HS 112 East aspect 9,100 26 degree slope broke back/9445
CT 13 SP @26cm density break during previous storm. CT 22 SC in the DH
ECTN 18 @36
ECTP 26 (I am noting a Q1 SC really popped)
SNOW STABILITY
 Snow Stability Rating for your observed area: Confidence: Trend:
BOTTOM LINE
 Comments: Touchy and moving towards a spooky moderate period with high pressure building.
FILE ATTACHMENTS

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