Observation: Moab

Observation Date
3/31/2019
Observer Name
Nauman and Howell
Region
Moab
Location Name or Route
El Pinche
Weather
Sky
Broken
Wind Direction
Northwest
Weather Comments
Today had a little of everything. There were periods of sun, but more clouds than not. Couple of flurries. There was some wind along the Pre-Laurel ridgeline, and some wind loading late in the day above Lone Pine. The clouds and minimal winds in most areas really kept the snow from early this morning in amazing shape.
Snow Characteristics
New Snow Depth
8"
New Snow Density
Low
Snow Surface Conditions
Powder
Snow Characteristics Comments
The snow was really light fun snow with about 8" at 10,000 and 10" up higher than 11,000 ft. This was a rare storm in the La Sals where the wind did not destroy everything. We were worried about slides on old snow surfaces and storm snow sloughs, but the new snow stayed super loose and unconsolidated with no cracking or collapsing. Things were quite supportable along our route.
Red Flags
Red Flags
Recent Avalanches
Red Flags Comments
There were many small storm snow slides that came out predictably from >40 degree pitches right under rock outcrops, but were all pretty small, isolated and manageable. By the time we got up into Talking Mountain area, prettimuch every little outcrop had already released the storm snow, particularly the more northerly faces that had really hard old snow interfaces. We skied the SE facing Goldminer pitch on ultra light powder with an edge-able bomb proof layer underneath, and we could not get any type of shear on at the storm snow interface. Then we went over to the observers left of El Pinche to see how the snow bonded on more westerly faces. Yesterday we got some late sun, so we were hoping that the new snow bonded on these aspects. Luckily, our hypothesis was confirmed with a snow pit at 11,200 (aspect: 300, slope 35 deg, total depth 210cm ) on an aspect and shading to mimic El Pinche. We had a result ECTN9 @ 163 cm that had a very irregular shear and no propagation. We had no other results in the pit - which we dug down to about 50 cm from the ground (150cm from surface) - pretty solid. Overall depth at the spot varied from 200 to 250cm within a couple of steps (probably talus underneathe). With this result, we decided to go up El Pinche, and I did quick had shear pits to ~3' at regular intervals. Everything looked great until we got to about 11,900' where I got a shear at 60 cm on some old grappel that I hadn't found below. It was late, and there was lots of hangfire further up on the observers right, so we decided to pull skins and ski from there right above the pinch point. The west faces were the only ones that didn't feel a little slippery at the interface, and the lack of consolidation of the snow gave us the perfect window to get into the alpine to ski this line - a rarity in the La Sals. The snow had slabbed up considerably down low on our way out, and I think the new storm snow might still be a little reactive tomorrow, particularly on north faces where the old snow surface was really hard. There was also some late day wind and the ridgelines had some wind loading that could result in a couple of slightly larger slides than we saw today.
Avalanche Problem #1
Problem
New Snow
Trend
Decreasing Danger
Problem #1 Comments
I think this new snow will still be a little reactive tomorrow, particularly on north faces. I think one more day of caution about this storm snow is warranted. If things warm up tomorrow, this could also get further lubed up.
Avalanche Problem #2
Problem
Wind Drifted Snow
Trend
Decreasing Danger
Problem #2 Comments
There was a good bit of snow blowing around in the high alpine this afternoon. I think that this might raise the likelihood for triggering slides to the old snow surface interface, but only in the really high mainly north-facing relatively extreme terrain.
Comments
Storm snow sloughing from steep areas below rock outcrops.
Good old fashion fun.
Today's Observed Danger Rating
Moderate
Tomorrows Estimated Danger Rating
Moderate