Observation: Moab

Observation Date
1/6/2019
Observer Name
Charlie Ramser
Region
Moab
Location Name or Route
Laurel Highway
Red Flags
Red Flags
Wind Loading
Cracking
Collapsing
Poor Snowpack Structure
Avalanche Problem #1
Problem
New Snow
Trend
Increasing Danger
Problem #1 Comments
Upside down snowpack paired with wind loading to make things even more upside down. Cracking as you skinned through the snow, whumpfing and collapsing. Very sensitive and reactive. Responsive to hand shear tests and storm/wind slab on top would remain intact. I skied between 10,000 and 11,000 feet and cannot speak to how the snow has set up in the high alpine.
Based on the forecast of more snow accompanied with more wind the trend seems to be increasing danger.
Avalanche Problem #2
Problem
Persistent Weak Layer
Trend
Increasing Danger
Problem #2 Comments
Played less with these layers buried deeper in our snowpack. The new snow was so reactive that I did not need to go very deep to find interesting results. A ski cut we did on a N aspect caused obvious cracking and collapsing. This failure was beneath this storm's and last storm's snow on some facets that have formed down there. Roughly 22 cm beneath the snow surface at 1pm.
Based on the forecast of more snow accompanied with more wind the trend seems to be increasing danger.
Comments
There were many signs of instability today in the La Sals. An exciting day for snow nerds to go skiing.
These signs included what we saw, felt, and herd.
We HERD whumfing when the recent storm snow and wind slap collapsed. It was collapsing on both the old low density storm snow and some faceted snow underneath. We also herd the wind howling through the trees. There were not huge pillows of snow balancing on tree limbs like there was after the last storm, the wind did not allow for much snow to hang out on the trees this time.
We FELT those same collapsed mentioned. We felt a very punchy and often unsupportable snow surface. If you left the compacted skin track on the Laurel ridge you could easily noticed the upside down snow structure. Also a simple ski pole probe highlighted the upside down nature. Last weeks snow was rather low density, this storm has not been. The more dense and more cohesive snow at the top is probably a combo of wind loaded snow and wetter more cohesive storm snow making a great slab on top of what's underneath.
We SAW cracks around our feet as we traveled through new snow. We saw stellar snow flakes, as well as partially formed graupel snowflakes. We also saw white frosted tree branches. This frost was growing on the top and bottom of the branches, and even on one side of my ski poles. This rime event was creating the graupel and frosting the trees. By the time we left the graupel had not accumulated very much, just a few noticeable balls on top of the fresh snow.
Skiing was better than I expected (North Woods vicinity). Was able to make turns and stay on top of the snow, despite difficult skinning at times.
Below is rime on snowflake/graupel, rime on trees, (hard to see) cracking/collapsing after a ski cut, cracking adjacent to skin track.
Today's Observed Danger Rating
High
Tomorrows Estimated Danger Rating
High
Coordinates