Pre-storm recon

Submission Info
Volunteer Observer
Wednesday, January 15, 2020 - 2:30pm
Mammoth Rock Bowl 37° 36' 47.3436" N, 118° 59' 41.1576" W
Snowpit Observations
More detailed information about the snowpack: 

I had a couple objectives this afternoon, mostly wanting to get a feel for the surface conditions before this next storm while also looking for wind slabs and facets.  As expected wind has been effecting most areas.  Some sastrugi, and cracking.  I did observe some sections of loose faceted pockets in sheltered areas.  Grain size ~.5cm.  I stopped short of Mammoth Bowl proper, N/NE aspect, ~9k', slope angle 31 degrees.

Sky Condition Broken, Air Temp -1 degree C, precip N/O, Wind Moderate from W/SW.  Boot Pen (when breaking through wind slab) 20cm otherwise 0.  Ski pen 0.

I was planning on digging a pit to identify layers beneath the top wind slab, but cement like conditions stopped me short.  P hard wind slab that measured ~30cm, with 1F rounds beneath it.  Stopped short maybe ~60cm deep.  Surface temp -10 degrees C.

Stomped on a couple test slopes, wind slabs weren't reactive.

There was still some light snow transport.  On descent, I noticed loose faceted sections giving away very easy and sluff ran a surprisingly long ways in the steeper terrain.




Snowpack photos: 
Weather Observations
Blowing Snow: 
Cloud Cover: 
75% of the sky covered by clouds
Air temperature: 
Below Freezing
Wind Speed: 
Air temperature trend: 
Wind Direction: 
Accumulation rate: 
More detailed information about the weather: 

Winds were swirling and bending.

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