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PROFESSIONAL OBSERVATION FORM
 Start Date: 02.28.19 Name: VandenBos, Wieland, Preuss Operation: SAC
 Drainage/Route:  Galena Peak Observed Terrain:  7,300-10,000' Zone/Region:  Smoky & Boulder Mountains
WEATHER OBSERVATIONS
 HN24: HST: Sky: Precip: Temps:
 Ridgeline Wind: Light and Intermittent from the NW
 Blowing Snow: Snow Available for Transport: Large amounts
AVALANCHE OBSERVATIONS
 No. Location Date Size Type Trigger Aspect Elevation Comments
 1 NW Bowl Galena Yesterday N R4 D4 (probably conservative on the R-scale?). Path maxima, ran from near summit of peak to end of historic path, cleared some mature timber on the margins of the path in places. Saw one tree that was flagged 40-50' off the ground 3,000' below upper crown. Based on snow amount on debris, likely ran 2/27. Crowns wrapped around 2 miles of terrain, ran a little over 2 miles horizontal. At least 50' of debris in the gully down low, probably more in places. Huge. Lookers right side of the crown complex (Galena Peak) was failing near the ground, lookers left side of the complex (Senate Peak) looked to have failed in mid-pack weak layers, maybe 2/2 given aspect.
 1 WNW Silver Peak Within past week N 7,200' Based on appearance, ran on DH near the ground. Many hundreds of feet wide. Likely ran mid-storm
 1 E Face Durance Yesterday 2 N E 500' wide, 2'(?) deep. Crown looked pretty crisp.
 Several W Face Durance Within past week Several pockets, a few more isolated and around 1-200' wide. One down lower several hundred feet wide. Appeared to gouge down towards deep weak layers in the pack.
 Several Within past week West side of 75, across from Easley Creek, above Cathedral Pines(ish). Several low elevation persistent slabs to the ground.
 Comments: Only reporting most obvious slides. Visibility wasn't great and many early-storm crowns are less obvious. Undoubtedly there is much more to be seen.
SNOWPACK OBSERVATIONS
 HS:  
 Upper Pack: Some interesting crusts near/at the surface, tough to put a finger on origin. Down low it almost felt like a rain crust (surprising giving elevation) which graded into an irregular 1-2 cm aerated crust (from frozen wet snow) up to ~9,000'.  
 Middle Pack:  
 Lower Pack:  
AVALANCHE PROBLEM ASSESSMENT
Avalanche Characteristics
Character/Avalanche Problem:
Wind Slab

Layer/Depth:


Likelihood of Triggering
Sensitivity:


Spatial Distribution:
Widespread
Terrain
  Primary Concern Comments: 
 
Avalanche Characteristics
Character/Avalanche Problem:
Deep Persistent Slab

Layer/Depth:


Likelihood of Triggering
Sensitivity:


Spatial Distribution:
Widespread
Terrain
  Problem 2 Comments: 
STABILITY TESTS
 Stability Test Results:
SNOW STABILITY
 Snow Stability Rating for your observed area: Confidence: Trend:
FILE ATTACHMENTS

190228_EFaceDuranceSlabs.JPG

190228_GalenaDeepSlab.JPG
Small fraction of the NW Galena crowns, these crowns are towards the lookers right margin of crown complex

190228_GalenaDeepSlabs.JPG
Small fraction of the NW Galena crowns, these crowns are towards the lookers right margin of crown complex

190228_SenateSlabs.JPG
Small fraction of the NW Galena crowns, these crowns are on the lookers left margin of crown complex.

190228_WFaceDuranceSlabs.JPG
Above Konrad Creek

190228_WFaceSilverDeepSlabs.JPG

190228_AlmostTipGrab.jpg
Reformed forecaster working in his almost tip grab off debris that traveled a few miles.

FlaggedTree.gif
Flagged tree in runout with a wild Preuss for scale.

Pano.gif