Observation: Skyline 11/18/2011

Observer Name: 
D Trotter S Cote
Region: 
Skyline
Observation Date: 
11/18/2011
Location or Route: 
GE Hill/ Big drift
Weather
Sky: 
Clear
Wind Direction: 
Southwest
Wind Speed: 
Moderate
Weather Comments: 

Winds have been at work, as usual.  Brush poking out on fetches, leeward pockets NE facing hold the bulk of snow,  wind skin or worse just about everywhere, did see some 2-3 mm surface hoar in scattered sheltered area, but would not say it was extensive nor a player. 

Snow Characteristics

Snow Characteristic Comments: 

Average snow depth 12"-14", deepest cornices/drifts 3'-4'.  East facing glazed from heating on summit ridges that are holding enough snow to glaze.

Natural cycle occurred during last storm evident on Wedding Ring Ridge with extensive cornice fall that did not seem to propagate anything underneath.  Other interesting observations include middle slope natural releases in usual shallow rocky areas.  Cracking evident on most ridgetops, fairly confident stresses have been relieved.  Hard slabs and spatial variability the words of the day, mixed in with bony subridges and anchors still visible

Red Flags

Red Flag Comments: 

exposed rock, hard slabs, pockety nature make the picture impossible to generalize.  Glazing on east facing and hard slabs NE through N will make for great sliding surfaces with new snow.

We tried to pick a spot for pit representative of due north wind loaded slopes.  we started ECT's well down off ridge and were getting consistent 7-9 Q 1 on a zipper wind crust down about 6"8".  As we worked our way up to the ridge line, near the top the depth remained the same, but the hard slab became stronger as you expect, and stopped propagating, but hung together down to old MF crust at ground interface. 

We did not find the old faceted October snow the is problematic in the Central Wasatch, don't feel this area got much snow earlier on, and what did fall, the constant wind and warmer weather have done a number on it.  It is worth mentioning we could find faceted snow in rocky areas where more air space was available, and this is supported by natural activity noted middle slope in known rocky areas.  The wrench in the works is knowing where these rocky areas are, combined with the required slope angle, aspect, and exposure to the wind to created a land mine.  Much thought should be given to watching out for shallow pack over rocky areas in the future as the winter progresses.

Good news, visually no too enticing, barely white in places, scattered coverage will make getting around difficult.  Shark teeth (love the analogy) everywhere, timber knock down from last year a big barrier in places, and things are pretty much welded in place due to warmer weather, constant wind, and time.

Bad news: only routes snow covered enough to traverse are right next to cornices that failed last storm cycle.   

Primary Concern

Primary Concern: 
New Snow
Probability: 
Moderate
Aspect: 
North
Northeast
East
Elevation: 
High
Trend: 
More Dangerous
Primary Concern Comments: 

New snow will be primary concern, feel the older snow surfaces provide sliding surface and if bonding is poor, will be very sensitive.

Other concern is due to obstables, rocks, and shallow snowpack greatly increase the chance of being injured in any kind of ride. 

The variability of existing snow is a wild card, and if all things came together just right, the potential for triggering a hard slab mid slope remains, cannot ignore repeated ECT 7-9 with Q 1 shears well off ridgelines

snow_profile_location: 
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Comments - Photos - Videos (group 1)

middle slope natural down Wedding Ring ridge

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Comments - Photos - Videos (group 2)

Natural cornice fall Wedding Ring ridge

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Comments - Photos - Videos (group 3)

cracking evident on ridgetops

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Comments - Photos - Videos (group 4)

typical of what we were seeing

Taba 015.jpg
Observed Danger Rating: 
Low
Forecast Danger Rating: 
Moderate

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