Observation: White Pine

Observation Date
1/24/2014
Observer Name
Kikkert
Region
Salt Lake » Little Cottonwood Canyon » White Pine
Location Name or Route
White Pine
Weather
Sky
Clear
Wind Direction
Northwest
Wind Speed
Light
Weather Comments
Clear and sunny. NW winds 10-15mph alon g the most upper elevation peaks only (11,000'), other wise pretty calm.
Snow Characteristics
Snow Surface Conditions
Dense Loose
Melt-Freeze Crust
Rain-Rime Crust
Snow Characteristics Comments

Lots of rime crust skiing in the exposed upper elevation terrain, with soft dense snow in sheltered areas. Rime crust has faceted out in some places, not in others (mostly not), with some areas scoured down to the rain crust. With some creativity there is still some fun skiing. Also, hadn't seen it reported before, but at least a portion of Red Baldy slid at the end of the last (only) storm cycle. Appeared to come out of one of the skiers left (south) chutes, with a decent debris pile on the lower apron.

Red Flags
Red Flags
Poor Snowpack Structure
Red Flags Comments
Poor snowpack structure still exists, although the variability is high (see below) and mostly stable conditions were observed.
Avalanche Problem #1
Problem
New Snow
Problem #1 Comments

Poked around a bit in upper White Pine, particularly the Red Baldy area, but with high snowpack variability (typical of Red Baldy even in a good year) take the ramblings below with a grain of salt. Digging and probing on the way up Red Baldy seemed to show a couple general snowpack setups. In the deposition areas (both wind and avalanche), such as the main gut on Red Baldy, the snowpack was generally between 130 and 150 cm deep. One pit in what seemed like an area representative of the deeper areas showed a snowpack that was more homogenous than I expected, mostly 1 finger in hardness. The old faceted snow from Nov and Dec was beginning to strengthen, while the snow on top from Jan was starting to facet (although not faceting as fast as in Dec due to warmer daytime temps; not sure this is true everywhere, maybe Brett has data to add). Although there is still some very week depth hoar, it was bridged by about 1 m of 1-finger snow. No results from stability tests. The other setup was the thinner areas, where the pack was 1 m deep or less. Didn't even bother digging in these areas as the ones I found were facets top to bottom. Could go from one setup to the other and back again in 10-20 feet. Concern would be if you found the intermediate between these two type of areas, with some continuity in the snowpack to allow propagation. I didn't on Red Baldy, which is good considering I was already there. I did dig another pit on a small north facing test slope at 9,200 feet (below the tri-chutes) that did have more of a slab over depth hoar, with relatively easy failure and complete propagation on depth hoar (ECTP22 Q1). Also spoke to a friend with good propagation in a PST on Dec facets in another drainage. Because of this potential to find a trap or two, I think pockets of moderate on upper elevation shady slopes is appropriate, thus the moderate chosen in danger rating field. Looking forward to the future, there are some interesting facet crust sandwiches out there, with many places where you have 2 thin crusts in the top couple cm, with small chained facets below as noted already by Evelyn (see photo below).

Avalanche Problem #2
Problem #2 Comments

Today's Observed Danger Rating
Moderate
Tomorrows Estimated Danger Rating
Moderate