UDOT PLANNED AVALANCHE CLOSURES!!

Observation: Circle Awl

Observation Date
2/17/2020
Observer Name
Robertson
Region
Salt Lake » Big Cottonwood Canyon » Circle Awl
Location Name or Route
Circle Awl
Red Flags
Red Flags
Recent Avalanches
Heavy Snowfall
Wind Loading
Cracking
Collapsing
Rapid Warming
Poor Snowpack Structure
Avalanche Problem #1
Problem
New Snow
Trend
Decreasing Danger
Problem #1 Comments
Quick pit at 8600' E showed ~12" new snow fell on top of a slight crust above about 5" of faceted grains on top of the Feb 7th rime crust. The lowest of the new snow was plates and stellars and had slightly denser storm snow on top. Subtle hardness difference but enough to collapse and propagate a fracture - ECTP2 down about 10" within the storm snow. I'd expect this should settle out quickly but it was enough to keep us in low angle terrain, regardless of the potential NSF issues everyone expected. Overall, snow skied very well - fast and supportive on E but a bit inverted due to solar on more S aspects on our exit. Sloughs were easy to trigger and ran moderately fast in steep enough E-facing terrain.
Avalanche Problem #2
Problem
Wind Drifted Snow
Trend
Decreasing Danger
Problem #2 Comments
Wind damage was apparent at mid to upper elevations around Raymond and Gobblers. Small wind lips/wind slabs were sensative but not massive where we traveled. They'd crack out around the skis and you could hear faint collapses with each step. In bigger, less sheltered and more consequential terrain, they would've been a major issue today.
Comments
First photo shows snow profile with slight density inversion due to crystal form. Second photo is stellars and plates which ECTP2 failed within. Third photo shows upper ~25" of the snowpack with 12" new snow on top of a slight crust on top of 5 inches of old faceted snow on top of the Feb 7th rime crust. Saw avalanches off of Raymond (pic in avy ob) and also Bonkers/Diving Board zone.
Even though I did not observe propagation in the old faceted snow after completing all ECT loading steps in my pit, I wouldn't trust that layer at the moment. Bed surface - persistent weak layer - now a decent load just waiting for a trigger.
Today's Observed Danger Rating
Considerable
Tomorrows Estimated Danger Rating
Moderate
Coordinates