Observation: Dry Fork of AF

Observation Date
12/22/2019
Observer Name
David Ream
Region
Salt Lake » Little Cottonwood Canyon » Alta Periphery » Dry Fork of AF
Location Name or Route
Dry Fork
Red Flags
Red Flags
Poor Snowpack Structure
Avalanche Problem #1
Problem
Persistent Weak Layer
Trend
Same
Problem #1 Comments
35 CM of 2 - 4 mm Dry weak facets sitting on the ground with a 70 cm stiff pencil to 1 finger hard slab sitting on top.
Comments
Dug a pit in the upper part of Dry Fork saddle just south of the top of the Supreme chair. North East facing at 10,400 feet.
I found a 70 cm strong pencil to one finger hard slab resting upon 35 to 40 cm of dry weak 1-3 mm facets. Stability test were failing on weakest facets just under the slab. Compression test failed at 1 and 2 taps from the elbow. Extended Column test were ECTP12 and ECTP15 respectively. The snow surface was a mix of pockets of soft wind drift, wind board which lots of old ski and snowmobile tracks. With the additional weight of the predicted storm snow and wind loading over Christmas the slab will get re-energized and the hazard rating will increase significantly.
Today's Observed Danger Rating
Low
Tomorrows Estimated Danger Rating
Low