Close
PROFESSIONAL OBSERVATION FORM
 Start Date: 11.25.17
 Drainage/Route:  Mushroom Ridge Observed Terrain:  10K, E, S, W Zone/Region:  Smoky & Boulder Mountains
WEATHER OBSERVATIONS
 HN24: 0 HST: Sky: BKN Precip: Temps: 0c
 Ridgeline Wind: Light and Intermittent from the W
 Blowing Snow: None Snow Available for Transport: Small amounts
 Comments: 5-10cm new from 3 days ago. Loose on all but pitched up S and SW.
AVALANCHE OBSERVATIONS
 No. Location Date Size Type Trigger Aspect Elevation Comments
 4 Dry ck Within past week 2 WL U SW 9500’ During rain event, point releases.
 Comments: Expected to see more activity from rain event. Days of pass area touring and Dry Ck slides were all I could confirm.
SNOWPACK OBSERVATIONS
 HS: 50-60cm HS.  
 Upper Pack: 5-10cm crust from last nights clear sky freeze. Yesterday by 1400 any S sloper was iso, but skiable. Shade stayed froze. Today, crust firm all day even on steep S. New snow starts at 8200’. 
 Middle Pack: Not observed, but pole pokes showed weak snow below crust.  
 Lower Pack: N/O. Haven’t been on anything high enough or shady enough to look for Sept snow. I imagine that NW face of Galena would have it. Given temps, I imagine that they are moist and maybe a little squished. 
AVALANCHE PROBLEM ASSESSMENT
Avalanche Characteristics
Character/Avalanche Problem:
Persistent Slab

Layer/Depth:
Full

Likelihood of Triggering
Sensitivity:
Stubborn

Spatial Distribution:
Specific
Terrain
  Primary Concern Comments: Sept snow. Guilty until.....
STABILITY TESTS
 Stability Test Results: None
SNOW STABILITY
 Snow Stability Rating for your observed area: Good Confidence: HIGH Trend: Steady
 Comments (aspects and elevations of instability, etc): We’ll see how this next rain event plays out. I think that it will take a crazy amount of free water to affect this current setup.
BOTTOM LINE
 Comments: It’s early season. Th crust surface is pretty smooth in the open, and bumpy and rugged in the trees and as you get lower. If we get into a snowy period, we’ll have to watch this crust. Last year we had a rain crust on NE, high elevation, and it produced some really dramatic slides when the precip kicked in. This current crust is really widespread and will affect many touring areas. Here in the wood river valley we don’t have much experience with buried crusts, so we might see unusual slides if we get much of a load on it.
FILE ATTACHMENTS

AA95E73F-6E07-445F-B2D2-E7E308B76A66.jpeg
Dry creek, back of Mushroom Ridge , wet loose slides from 11/20 rain event.