Observation Date
12/25/2020
Observer Name
R. Neill
Region
Salt Lake » Big Cottonwood Canyon » Guardsman Pass area
Location Name or Route
Guardsman Pass to PC Ridgeline
Comments
Toured up Guardsman Pass and then traversed PC Ridgeline to West Monitor to check out snow levels in the area. Stayed on ridgeline/low angle.
Observation 1: Widespread surface hoar seen in Guardsman Pass area. All aspects without evergreen tree coverage that I traveled between the road closure and just below Guardsman Pass had hoar. That is NW through W through S facing. Anything with a significant slope had smaller crystals of maybe 2-5 mm tops. Flats/depressions where air had pooled had crystals 20mm or larger.
Observation 2: Avalanche. Didnt get a picture and I was alone so I wasn't going anywhere near the steeps to check it out. NE facing, start zone 35-40°, crown 100-150 ft, 1-2 feet deep, ran ~400 ft vertical to the flats probably on the facets, broke where ridge rolled over. Trigger: explosive or maybe ski cut. It was just barely in bounds of PC with explosive marks nearby and, I assumed, patrol's tracks entering the bed surface. Ran through a nasty clump of small aspens.
Observation 3: S and SW aspects had solar warming, sometimes with a slight crust a couple cm below the surface. I didn't realize it at the time, but it was definitely the same phenomen Staples just posted about.
Observation 4: Minor collapsing. Was mostly on established skin tracks but heard a couple barely audible collapses.
Observation 5: Wind loading. PC side of ridge was variably wind loaded as expected.


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