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Observation: Laurel Highway

Observation Date
2/20/2023
Observer Name
Garcia
Region
Moab » Laurel Highway
Location Name or Route
Laurel Highway, Funnel Trees
Weather
Sky
Broken
Wind Direction
West
Wind Speed
Moderate
Weather Comments
The winds were confined to ridgelines. Calm to light down off the ridges. No blowing or drifting observed.
Snow Characteristics
Snow Surface Conditions
Dense Loose
Wind Crust
Snow Characteristics Comments
Went looking for weak surface snow ahead of the incoming storm. I didn't find any weaknesses in the foot of snow that fell a weak ago. Warm temperatures and sunshine have left dense, well consolidated snow out of the wind zone. Open terrain near and above treeline is a mix of occasional dense loose, hard wind scoured crusts, old hard wind slab, and recent soft wind slab.
Red Flags
Red Flags
Poor Snowpack Structure
Avalanche Problem #1
Problem
Persistent Weak Layer
Trend
Same
Problem #1 Comments
I continued to find buried facets in my travels today. The goal was to dig a bunch of pits to track the distribution of these buried facets before the incoming storm.
Pit #1: Julie's Backside NE 10,960 ft. CT16 SP down 25cm on 0.5mm NSF. Shovel Tilt Tests produced clean, planar shears with Moderate force.
Pit #2 and #3: Between Julie's Backside and Coyote Chute NE 11,110 ft. Dug two pits here a couple hundred feet apart. No facets. This slope had more trees on it and less exposure to the clear sky.
Pit #4: Coyote Chute NE 11,314 ft. CT13 SP down 26cm on .25 - .50mm NSF. These facets are beneath a P+ hard crust. Shovel Tilt Tests produced planar shears with moderate force.
Pit #5: Funnel Trees NW 11,020 ft. This slope had seem some previous wind drifting, and the facets were a bit deeper than other slopes I looked at today. The weak layer seen here is down 60cm below the surface and contains a mix of graupel and small grained (0.5mm) facets. Shovel Tilt Tests produced no results. No results with a compression test (CTN), and no results with an ECT (ECTX).
The bottom line here is that enough facets exist on Northerlies that we need to exercise caution on these slopes when the storm arrives late Tuesday. The forecast is for very strong winds and possibly a foot of snow. This will build fresh wind slabs on top of these weak layers. If the storm shapes up as predicted, I'm going to assume these slopes guilty until proven innocent.
Today's Observed Danger Rating
Moderate
Tomorrows Estimated Danger Rating
Moderate
Coordinates