Wide-spread surface hoar on andesite peak

Location Name: 
Andesite Peak
Region: 
Donner Summit Area
Date and time of observation: 
Sun, 01/21/2018 - 16:07
Location Map: 
United States
39° 21' 1.7784" N, 120° 21' 50.9436" W
See map: Google Maps
US



Observation made by: Educator at Tahoe Mountain School
Snowpit Observations
More detailed information about the snowpack: 

Widespread surface hoar (2-5mm) was present on West, North and East aspects.  We were not on south aspects and unable to make an observation there.  Very large 1cm+ surface hoar near open creeks(see picture).

Snowpit or crown profile photo or graph: 
Weather Observations
Blowing Snow: 
No
Cloud Cover: 
75% of the sky covered by clouds
Air temperature: 
Below Freezing
Wind Speed: 
Light
Precipitation: 
None
Air temperature trend: 
Static
Wind Direction: 
Southwest
Accumulation rate: 
None