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Observation: Cardiff Fork

Observation Date
3/26/2017
Observer Name
Greg Gagne
Region
Salt Lake » Big Cottonwood Canyon » Cardiff Fork
Location Name or Route
Cardiff Fork
Weather
Sky
Clear
Wind Direction
Northwest
Wind Speed
Light
Weather Comments
Beautiful morning with clear skies and very comfortable temperatures (mid teens F) with just a light wind along ridgelines.
Snow Characteristics
New Snow Depth
6"
New Snow Density
Medium
Snow Surface Conditions
Powder
Snow Characteristics Comments

10-15 cms (4-6") new from Saturday. I was out yesterday and the storm snow was damp and heavy. The clear sky overnight helped "dry out" the new snow somewhat, and I also suspect the last piece of the storm came in colder, yielding lower-density snow. The new snow has bonded well to the old snow surface - which with the exception of upper elevation north - was crusted on Friday. However, I am expecting this Friday crust may provide a good bed surface for avalanche activity on Monday/Tuesday. (more thoughts below.)

Avalanche Problem #1
Problem
Wet Snow
Problem #1 Comments

I was out very early, and exited by 9:30 am, so missed any wet activity. But the likely issue on Sunday was wet activity.

Comments

Dawn patrol to enjoy the decent Saturday storm snow. Some dust-on-crust conditions, but the generally smooth crusted surface and dense snow from Saturday made for enjoyable riding and travel conditions.

I was able to get the Saturday storm snow to sluff on steeper north-facing terrain (i.e. Holy Moly), but it required slopes at least 40° in steepness, and not all slopes would sluff.

The storm snow from Wed/Thur has settled out and I was unable to get any clean shears between these two storm events. (On Thursday I was finding a poor bond at this interface, and it was still reactive on Friday as well.) The strong sun crusted all aspects on Friday (other than high due north) with crusts of varying thicknesses, and I am suspecting these crusts will provide a bed surface for any avalanche activity with the Monday/Tuesday storm.

Photos are of loose, dry sluffs moving on the Friday sun crust. East and North aspects

We got through the significant warm up in mid March without significant wet slabs likely because we had a mostly unstructured snowpack. I dug a few pits on upper elevation north aspects this morning, and noticed a M/F crust from the old (pre 3/22) snowpack. The thickness of this crust varies, and is now buried ~ 30 cms (12") down from the surface. When the north aspects inevitably warm up, it is worthwhile keeping this crust in mind as it may provide a barrier for liquid water to penetrate down through the snowpack. (Mark Staples' now-infamous "Tang Test")

Video
Today's Observed Danger Rating
Moderate
Tomorrows Estimated Danger Rating
Moderate