UDOT PLANNED AVALANCHE CLOSURES!!

Observation: Gobblers

Observation Date
1/6/2020
Observer Name
Grainger
Region
Salt Lake » Big Cottonwood Canyon » Mill Creek Canyon » Mill A » Butler Fork » Gobblers
Location Name or Route
Gobbler's Knob
Weather
Sky
Clear
Wind Direction
West
Wind Speed
Light
Weather Comments
Sunny with ridgetop winds generally Westerly and light-moderate. Upsloping terrain influences. Snow transport and cornice building along ridgetops evident.
Snow Characteristics
New Snow Depth
2"
New Snow Density
Low
Snow Surface Conditions
Powder
Faceted Loose
Wind Crust
Snow Characteristics Comments
The last week's wind have had obvious effects on exposed areas and ridgelines. Rippled texture across cross-load slopes, young sastrugi along ridges, and continuing cornice formation are present in the upper basins. Primary concern is the crust on solar aspects and its interface with the New Years (wind-affected) storm slab. This interface was a mixed bag in the Yellowjacket/Pole Canyon/Alexander area. While some southerly aspects showed weakness, much of the new snow was not deep and slabbed up enough to propagate like we saw in the upper Cottonwoods this last week.
Northerly hand pits from 8000-9500' showed little to be alarmed about, deeper facets rounding and the only issues associated with wind slabs along ridgelines.
Wind slab along lee side of ridges produced a few avalanches incorporating the last storm slab in the usual spots (photos 1-3). Unclear if they were all natural cornice fall or if any were triggered by last weekend's traffic.
Red Flags
Red Flags
Recent Avalanches
Wind Loading
Poor Snowpack Structure
Avalanche Problem #1
Problem
Wind Drifted Snow
Trend
Same
Comments
Activity from the last few days (likely natural cornice-triggered), isolated storm slab. East facing.
North-facing ~80' wide, 12" deep wind slab.
Southwest-facing pit 90cm HS held crust layers at 25cm and 41cm, netiher produced in tests. The top 14cm storm snow (shown removed) had RP fractures with SSTM but was not cohesive enough to fail in other tests.
Today's Observed Danger Rating
Moderate
Tomorrows Estimated Danger Rating
Moderate
Coordinates