Observation: White Pine

Observation Date
2/5/2025
Observer Name
Zimmerman-Wall/ AIARE PRO 2
Region
Salt Lake » Little Cottonwood Canyon » White Pine
Location Name or Route
White Pine
Weather
Sky
Overcast
Precipitation
Moderate Snowfall
Wind Direction
Northwest
Wind Speed
Moderate
Weather Comments
Afternoon tour from 1pm-4pm. Brief, intense frontal passage at 1:15pm. Lightning, S2 snowfall, moderate wind at low elevations, staying strong to extreme up high. Sky was mostly overcast with brief periods of broken and intermittent sunshine, not enough to cause warming. New snow accumulation of about 1" of graupel at 8500'. Measured air temp of 0c at 8000'
Snow Characteristics
New Snow Depth
1"
New Snow Density
Medium
Snow Surface Conditions
Damp
Snow Characteristics Comments
Mixed bag of wet surface conditions in many locales at low elevation. Snowpack below 8000' is isothermal. Foot penetration of 60cm. Above 8500' the new snow was supportable and not too sticky. That being said, we stuck to the road for the ascent/descent to avoid trenching into the unconsolidated mank beneath the new snow.
Red Flags
Red Flags
Recent Avalanches
Red Flags Comments
We saw some recent wet loose from today and some larger releases from yesterday.
Avalanche Problem #1
Problem
Wet Snow
Trend
Same
Problem #1 Comments
This is the primary problem where we traveled today and we specifically wanted to know more about the snow at low elevation. The potential for deeper gouguing wet loose is possible on slopes >30 degrees and this was evidenced by some small slope testing.
Avalanche Problem #2
Problem
Persistent Weak Layer
Trend
Same
Problem #2 Comments
This problem is trending stubborn to unreactive at mid elevation in this drainage out of the influence of wind. We targeted the 1/31 interface of near surface facets, and in some isolated locations, surface hoar. We performed over a dozen snowpack tests on W-NW facing terrain between 8,000' -8,500'. Numerous CT results showed initiation, but many were Restent Planar, with only a few Sudden Collapse on the aforementioned surface hoar (5mm-10mm). ECTN results on majority pits, with one propagating result on 10mm surface hoar.
The upper 25cm of snowpack has become moist, with the rest of the snowpack still dry at 8,500. Mid pack is stout 1F-P hard rounded grains. Basal facets are 2-3mm but showing signs of rounding and did not prove reactive in tests.
We did get visual of the upper white pine drainage at a break in the clouds around 330pm. The Birthday Chutes were looking like they had been crossloaded. The starting zone of the Tri Chutes is stripped bare from so many days of intense SW-W winds.
Comments
We moved as two groups trying to gather a larger, spatially variable set of data points targeting the recently developed near surface facets and seeing if water had moved down through the snowpack.
Photo 1: White Pine TH tree wells around aspens. Isothermal snowpack in surrouding areas and lower meadow adjacent to trail.
Photo 2: ECTP17 on 10mm SH at 8500'
Photo 3: Buried 10mm SH found near creek at this elevation
Photo 4: CT results on 5mm SH at 8500'
Photo 5: Buried 5mm SH found in sheltered meadow with clear view of sky.
Photo 6: Side by side tests across meadow. Initiation, but no propagation.
Photo 7: Roller balls on lower West Scotties.
Today's Observed Danger Rating
Moderate
Tomorrows Estimated Danger Rating
None
Coordinates