Observation: Maple Hollow

Observation Date
02/28/2017
Observer Name
Toddeo

Region:

Location Name or Route
Pahvants - Maple Hollow
Weather
Sky
Broken
Precipitation
Light Snowfall
Wind Speed
Calm
Weather Comments
Broken sky with some insatbility showers, trace of snow.
Snow Characteristics
New Snow Depth
8"
New Snow Density
Low
Snow Surface Conditions
Powder
Melt-Freeze Crust
Damp
Snow Characteristics Comments

HST=6" at the 6,400' trailhead and 8" at 8,400'.  This is more than the 4" reported at the Pine Creek and Bobs Hollow Snotel sites.

Some damp snow on the road at my exit, crust forming in shady spots.
 

Red Flags
Red Flags
Wind Loading
Red Flags Comments
Wind slabs were present on the NW facing ridge I skied and skinned. Generally buried below 4-8" of storm snow. I would guess these formed as the wind picked up Sunday night into Monday. Hard to isolate the wind slabs in many locations on slopes exceeding 30 degrees, they broke without a clean shear and seemed to lack energy.
Avalanche Problem #1
Type
Wind Slab
Trend
Same
Problem #1 Comments

Moderate Hazard in this area.  I walked on top of a lot of supportable wind slabs without any cracking or collapsing.

Avalanche Problem #2
Type
Wet Slab
Trend
Increasing Danger
Problem #2 Comments

Wet slabs will be an issue if the sun comes out.  Southerly aspects.

Snow Profile
Aspect
Northwest
Elevation
8000
Slope Angle
30
Comments

Upper snow profile showing results of ECT.  ECTP 8, Q2/3 , 8" below surface, at the base of a 2" thick 1 finger wind slab.  Failed on a slightly damp low density layer.  Storm snow from the last 2 storms above the crust is 16" at this location.  Glove is sitting on layer that failed.  Trail breaking a bit of an effort.

Photo below, instability showers.

Photo below:  Terrain.

Overall I would say a moderate danger, consistent with what I saw on Sunday, the new snow does not appear to have increased the hazard in this area.

Today's Observed Danger Rating
Moderate
Tomorrows Estimated Danger Rating
Moderate
Snow Profile Coordinates