Observation: Wooley Hole

Observation Date
3/31/2019
Observer Name
Wilson, Hardesty
Region
Provo » Provo Canyon » Timpanogos » Wooley Hole
Location Name or Route
Wooley Hole
Weather
Sky
Clear
Wind Speed
Calm
Weather Comments
Severe clear. Warm temps, calm winds; what an incredible pleasure! Enough of a refreeze last night to keep snow behaved.
Snow Characteristics
New Snow Depth
3"
New Snow Density
Medium
Snow Surface Conditions
Powder
Melt-Freeze Crust
Damp
Snow Characteristics Comments
Provo only got a fraction of the precip that the Central Wasatch got in the last storm. An inch down low, maybe 3-4" around 9,500'. Snow surfaces weakening.
Ski quality was quite good none-the-less: Nice wind buff on the North facing, and buttery Shmoo over a supportable crust on the east and west, when each were in the sun.
Red Flags
Red Flags
Poor Snowpack Structure
Red Flags Comments
Enough of an isolated upside down wind slab over faceted graupel to turn us around while ascending steep terrain.
Snow Profile
Aspect
North
Elevation
8,000'
Slope Angle
25°
Comments
Compared north-facing and south-facing aspects at 7900 feet.
On the south the snow surface was wet and water was pooling 1.5" down in the bottom cm of new snow. Below was a 6" inch melt freeze crust. Compression tests failed with moderate taps below this"corn slab" where it transitioned to 5" of very wet melt freeze grains.
On the North the snow was dry. Roughly two inches of new over a 2" crust. CT13 and CT21 below the crust, but neither in a smooth nor energetic way. 50 cm down the graupel layer that Evelyn found on the 25th is still reactive, but not without an extra hard "Tap 31".
Pic below: 15cm of weakening storm snow above the crust on mid-elevation northerlies. Good bed surface; weakening snow surface; slab incoming for mid-week storm?
The most interesting pit was at 9800 feet as we ascended from Wooley Hole to Pika Cirque. We'd skinned easily up through soft 4 to 6" wind slab overlying graupel for all of the apron and most of the chute. As we neared the top, however, the snow sounded and felt different. A quick pole probe had the punch- through feeling that makes a person pull the shovel out as the snow felt punchy and 'upside down'. No collapsing noted; minor cracking.
Extended column test propagated with five taps (1st test) and then 13 taps (2nd) on a faceting graupel layer below the slab. Not very energetic, but with 18" above the weakness we made the call to ski other slopes instead.
Cornices still impressive along the Timp Ridgeline.
Size 1-2 sluffs in upper Pika Cirque
Consolation prize was a surprising exit through what appeared to be a cliff band.
Today's Observed Danger Rating
Low
Tomorrows Estimated Danger Rating
None