Observation: Big Cottonwood Canyon

Observation Date
12/8/2015
Observer Name
Evelyn
Region
Salt Lake » Big Cottonwood Canyon
Location Name or Route
Big Cottonwood
Weather
Sky
Broken
Wind Direction
Northwest
Wind Speed
Light
Weather Comments
Variable cloud cover. Unseasonably warm temperatures. Many of the 7 to 8,500' stations have had temperatures mostly above freezing for 48 hours.
Snow Characteristics
New Snow Depth
1"
New Snow Density
High
Snow Surface Conditions
Dense Loose
Damp
Snow Characteristics Comments

Hard to guess on the rain/snow line. Eventually seemed to drop to about 8,500'? Morning thin rain crusts melted mid day, changing into damp surface snow.

Red Flags
Red Flags
Poor Snowpack Structure
Red Flags Comments
Poor structoure at the mid to upper elevations, except on the southerly facing slopes.
Snow Profile
Aspect
Northeast
Elevation
9,800'
Comments

Snow pack averaged 35 to 55 cm deep, scattered thin wind slabs cracked under foot, but didn't propagate. Even at this elevation, the snow pack seemed to be changing a bit with the warmer temperatures. On snow pit tests, once the the wind slab slid off, ECT didn't work - no slab - the snow just mushed down.

Seemed the snow near the ground was warming and becoming moist in places. While another 24 hours of warm temperatures is better than cold, it still won't be able to solve our weak facet problem.

Also looked at snow at lower elevations:

5,200', north facing - very patchy, wet, unfrozen; will be strong when it cools and freezes.

6,800', north facing - damp again throughout the whole pack; will be strong when cools.

7,400', north facing - Photo Below. A bit more layering; but the whole "pack" moist. Basal facets are warm, rounding and moist. Good news. Will be stronger when they cool. Just uncertain as to what elevation the snow pack warming is occurring.

Sure sign it rained.

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