Observation: Laurel Highway

Observation Date
1/31/2023
Observer Name
Garcia
Region
Moab » Laurel Highway
Location Name or Route
Laurel Highway, Gold Basin
Weather
Sky
Clear
Wind Direction
North
Wind Speed
Moderate
Weather Comments
A beautiful, but windy day in the mountains. The winds were quite erratic, swinging back and forth between WNW and ENE. It was pretty entertaining watching the anemometer swing back and forth on top of Pre Laurel Peak. Gusts were mid to high 20's.
Snow Characteristics
New Snow Depth
5"
New Snow Density
Low
Snow Surface Conditions
Powder
Snow Characteristics Comments
Cold smoke. Very low density snow made for great skiing out of the wind zone. The snow on the solar aspects was getting heavy and sun affected by 12:30. Skins were glopping while ascending solar aspects. My bet is solars are cooked on Wednesday. Best skiing will be on slopes that are not wind or sun affected.
Red Flags
Red Flags
Recent Avalanches
Wind Loading
Red Flags Comments
I saw a number of dry loose avalanches in steep terrain on Northerly aspects. I observed two very small, pockety avalanches of wind drifted snow that ran naturally, also on Northerly aspects.
Avalanche Problem #1
Problem
Wind Drifted Snow
Trend
Increasing Danger
Problem #1 Comments
I observed moderate to intense snow transport all day long. Ridgetop winds were shifting directions and loading a variety of aspects. Expect to find fresh, sensitive drifts on all aspects ATL on Wednesday. Northerly aspects were previously loaded and appeared fat, rounded, and pillowy. Almost all leeward slopes above treeline were very obviously loaded.
The small slide just right of center is a small pocket of wind drifted snow that ripped out above Tele Gold. If you look closely you can see a crown. Also, look how fat and pillowy the slopes are above and below this slide.
The slope in the center of this photo is another great example of an obviously wind loaded slope. This is what we mean when we say "fat, round, and pillowy." Any steep slope that looks like this should be avoided.
Avalanche Problem #2
Problem
Persistent Weak Layer
Trend
Decreasing Danger
Problem #2 Comments
I spent Monday and Tuesday hunting for weak layers in the recent new snow. The La Sals have received about 15" of new snow in the last week. On Monday I dug on a North facing slope at 10,800 ft. I got a CT25 RP down 40 cm on a layer of preserved Stellars. Today I had a chance to investigate this further. On an East facing slope at 10,230 ft I located this same layer of buried Stellars 50 cm below the surface. On this layer I got CT22 RP, CT 15 RP, ECTX. So no propagation on an Extended Column Test. This layer is very hard to detect in the pit wall, and only reveals itself with shovel shears, compression tests, or shovel tilt tests. With shovel tilts, it required Hard force to produce a shear. The bottom line is this is a weak interface within storm snow layers. As time goes on, I expect it to become harder to produce failures on this layer. I did not observe any facets associated with this layer, or anywhere in the upper 100 cm of the pack. HS at today's East facing pit in the Gold Basin Moraines was 315 cm. (The slope is clearly wind drifted).
I also checked out a SSW aspect at 10,700 to see if I could find any weak interfaces. At this location I found strong snow F-4F-1F in the top of the pack with no weak interfaces. I did two compression tests with no failures (CTN x2). HS here is 270 cm.
SSW aspect showing strong snow.
CT22 RP down 50cm on buried Stellars, East aspect 10,230 ft.
Today's Observed Danger Rating
Moderate
Tomorrows Estimated Danger Rating
Moderate
Coordinates