Observation: 10420

Observation Date
1/26/2025
Observer Name
Champion & Talty & Gagne
Region
Salt Lake » Big Cottonwood Canyon » 10420
Location Name or Route
10420
Weather
Sky
Few
Wind Direction
Southeast
Wind Speed
Calm
Weather Comments
Beautiful sunny day with calm winds and generally clear skies, interrupted only by a few high clouds. There were no signs of transport, and temperatures were finally comfortable.
Snow Characteristics
New Snow Depth
4"
New Snow Density
Low
Snow Surface Conditions
Powder
Wind Crust
Snow Characteristics Comments
I was pleasantly surprised by the soft snow surface. With the ease in winds over the last 24 hours, the soft snow was still present in many areas, with about 4-6 inches in most spots.
Red Flags
Red Flags
Poor Snowpack Structure
Red Flags Comments
The primary concern we noted today was the small-grain facets just below shallow wind drifts.
Comments
We examined multiple aspects while climbing up to 10,420'. Visibility was good, and signs of this week's earlier wind event were obvious. Throughout our travels, we found 4-6 inches of low-density new snow sitting atop a variety of snow surfaces, ranging from stout wind board along much of the ridgeline to a firmer crust with small-grain facets above it on solar aspects.
In some areas, the wind drifts seemed shallow and sensitive, while in others, the drifts were hard and supportable, allowing travel far out onto them. There is significant spatial variability in the distribution of the wind slab at the moment.
The most concerning areas are the shallower ones, where small-grain facets are directly beneath the wind slab on the old snow surface. On a northeast aspect at 9,620', we observed a 4F to 1F hard slab sitting atop F-hard small-grain facets. This supportable slab propagated at ECTP12, approximately 20 cm down. This was repeatable.
NE Aspect - 9620' - ECTP12
Small observed cracking - NE Aspect - 9500'
Wind texture observed from the top of 10420' looking down canyon
Today's Observed Danger Rating
Moderate
Tomorrows Estimated Danger Rating
Moderate
Coordinates