Observation: White Pine

Observation Date
12/19/2019
Observer Name
Zimmerman-Wall/Bremer/Latosuo AIARE PRO 1
Region
Salt Lake » Little Cottonwood Canyon » White Pine
Location Name or Route
White Pine Fork
Red Flags
Red Flags
Poor Snowpack Structure
Avalanche Problem #1
Problem
Persistent Weak Layer
Trend
Decreasing Danger
Problem #1 Comments
Targeted lower elevation north facing terrain to determine prevalence of the October facets. The bottom 10-15 cms of the snowpack is composed of 1.5mm course grains that are showing prominent signs of rounding, especially in locations where the ground cover is more shrubs than rock.
No repeatable propensity for propagation in the various profiles performed. Surface form are facets (1mm) and surface hoar (2-3mm) in many sheltered locations at the lower elevations. This makes for good skiing right now, but if the next series of storms comes in without much wind or heat, these grains may persist and become a new weak layer, particularly on the exits from some of the bigger terrain. In the core of the Cottonwoods we have observed a trend of increasing strength in the old snow at the ground. The forecasted weather regime seems like it continue to help this process take hold and the holiday storms may only bring new snow and storm interface instabilities.
Snow Profile
Aspect
Northeast
Elevation
8,100'
Comments
Stable weather from AM to PM. Lt westerly winds not transporting snow along ridge tops, but the Birthday Chutes had surface texture indicating recent wind affect. Temps were cold at shady trailhead, but warming took place by mid afternoon. The south facing terrain was definitely in full sun. However, no recent wet activity was noted along the LCC canyon wall above the highway. It appears that many travelers have visited the larger south facing paths of Little Pine and Tanners over the last period of clear weather. No noted avalanches in these paths, but also no community observations to support the weight of evidence of inactivity. Of the hundreds of tracks on the south facing terrain of LCC, have only seen a handful of observations come in.
Photos:
South facing Little Pine path over Highway 210
Upper White Pine (Red Baldy)
Surface hoar in sheltered areas ( >3mm)
Lower Pink Pine Ridge where profiles were performed.
Today's Observed Danger Rating
Moderate
Tomorrows Estimated Danger Rating
Moderate
Coordinates