Observation: Turnagain

Location: Center Ridge

Route & General Observations

Toured up from Center Ridge parking lot around 10am, walked to the weather station and over to the north side of center ridge facing the library. Goals for the day were to dig pits on the north side of center ridge and investigate surface conditions.

Red Flags
Red flags are simple visual clues that are a sign of potential avalanche danger. Please record any sign of red flags below.
Observer Comments

High presence of glide cracks evident along Seattle Ridge and along the Library

Weather & Snow Characteristics
Please provide details to help us determine the weather and snowpack during the time this observation took place.

10am at Center Ridge PL ~1000'
Calm winds, clear skies, -10°C air temp
12pm at pit locations ~1900'
Calm winds, few clouds, -4°C air temp
3pm at Center Ridge PL ~1000'
Calm winds, clear skies, -5°C air temp
Very strong inversion!

Snow surface

Observed a wide range of surface hoar that varied with elevation
1-2cm sized surface hoar from 1000' to 1370' (pic below)
2mm surface hoar mixed with near-surface facets from 1370' to 1830'
At pit location @ 1960' just observed near-surface facets (1mm) mixed with decomposing stellars
No wind effect below treeline, wind affected rollovers near treeline showed stubborn surface wind slabs
Great snow in the trees, loud pow!


We dug a series of three total pits on a N aspect at ~1900' on Center Ridge
Height of snow ranged from 210cm to 135cm between pits
Key stability test results:
In pit with 135cm depth, PST 58/100 END x2 94cm down on a layer of facets where the thanksgiving crust was
ECTX in all pits
In pit with 210cm depth, CT25 SC 30cm down on a hardness interface, result did not repeat in second CT
Rounding basal facets at base of snowpack
Overall we found fair structure and good stability in this location

Photos & Video
Please upload photos below. Maximum of 5 megabytes per image. Click here for help on resizing images. If you are having trouble uploading please email images separately to staff.