Observation: Ivory Flakes

Observation Date
1/16/2016
Observer Name
mark white
Region
Salt Lake » Big Cottonwood Canyon » Cardiff Fork » Ivory Flakes
Location Name or Route
Ivory Flakes, Cardiff Fork
Weather
Sky
Overcast
Precipitation
Light Snowfall
Wind Direction
Southwest
Wind Speed
Moderate
Weather Comments
Some sun in the morning quickly turning gray and a abundance of flat light, light winds in the AM from the SW increasing to moderate in the PM.
Snow Characteristics
New Snow Depth
20"
New Snow Density
Medium
Snow Surface Conditions
Powder
Snow Characteristics Comments

Not the blower powder of yesterday, 20 inches storm total with a density inversion about 3 inches down, cause by a round of graupel last night. Inverted would be a good term.

Red Flags
Red Flags
Wind Loading
Collapsing
Poor Snowpack Structure
Comments

Headed up Cardiff via BCC to avoid the traffic junk show in LCC, travel was up to Ivory Flakes, the lower rock slabs and then over to George's bowl for the exit. Interesting difference in snow totals, Ivory Flakes had 20 inches of new snow where just down canyon a bit in George's the snow total was more like 12 to 14. did not note much natural activity in the upper bowls of Cardiff, except some long running sluffs on Cardiac Ridge and one soft slab also noted mid slope Cardiac Ridge, and another soft slab under the rocks in Ivory that must have occurred yesterday. The new snow in upper Cardiff was inverted and almost too deep to ski except on the steepest of slopes which we avoided. The new snow set up was 15 inches of light density from yesterday then a 3 inch layer of graupel that fell last night, capped of by another 3 inches of light density, the density inversion was easily felt with pole probes, while breaking trail and also while skiing. Yesterday there was no cohesive slab, today one was forming through the density inversion, settlement, and the surface being slabbed up by the increasing wind from the SW. My partners and I experienced a few collapses through out the day but no cracking.

Photos: a look at the layering of the new snow, you can see the layer of graupel about 2 inches down if you look close, old soft slab under the Ivory rock bands, a look at the activity on Cardiac Ridge, and wallowing while breaking trail in the inverted snow. Flat light lead to bad photos.

Hazard seems very location dependent allot of places did not receive the mother lode of snow like Cardiff, and I would think wind sheltered mid elevation the hazard would be moderate, but up high in the wind exposed alpine I would stick to considerable especially if the wind gets out of hand and we get denser snow on top.

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