Base Basin MT

Fan on S Side Basin Mt and NE facing gully looker's rt of fan
Submission Info
Sunday, January 12, 2020 - 7:45am
Red Flags: 
Whumphing noises, shooting cracks, or collapsing
37° 17' 42.2412" N, 118° 38' 18.1752" W
Snowpit Observations
More detailed information about the snowpack: 

went up 1800 ft on fan s side of basin mt hoping to find smooth winboard on fan or old winter snow in gully.  Found little of either.  Fan covered with 5 cm sastrugi fromed by ne winds. Sage sticking out...bony. Pole (basket end down) punched thru crust to a firmer base 2 to 7 cm all the way up fan. At 9,600' I encountered an exposed rain crust which provided a break surface when covered by 5 cm  of snow and on  steeper pitch (poto) .

Found a location with deeper drifted snow dug 45 cm to ground.  Bottom layer of pack was suprisingly firm and secure. up 15 cm sugar layer,  at 30 cm up sugar layer just under rain crust. 40 cm up sugar layer, surface 45 cm breakable crust.

Skied n facing side of gully into bottom.  patches of old winter snow.  10 meters before gully bottom triggered whump and settled.  pencil crack ran at least 20 m.  Slope was appx 30 deg. (poto). triggered a second lower down at 9200'.  same aspect/result.  Found better snow on ne facing aspect as I skied, but trip not worth the turns; However did see deer and many deer tracks between 8 and 8500'.

At bottom of gully 8400' saw a 2-3 cm crack series that ran for 40 m.  It was on same aspect where I caused settling. 



Snowpack photos: 
fan on looker's left  gully on rt
crack ran 20 m after whump sorry hard to see
5cm wind crust over rain crust on fan
Weather Observations
Cloud Cover: 
100% of the sky covered by clouds
Air temperature: 
Above Freezing
Wind Speed: 
Air temperature trend: 
Wind Direction: 
-- placeholder --

ESAC receives significant financial support from ...