A first hand account of the Nov 16 Hourglass avalanche became available on Nov 21. Read it here.
Observations from Castle Peak
Donner Summit Area
Date and time of observation:
Thu, 11/09/2017 - 12:00
United States39° 22' 1.7616" N, 120° 21' 12.9348" W
Recent loading by new snow, wind, or rain
Observation made by: Forecaster