A first hand account of the Nov 16 Hourglass avalanche became available on Nov 21. Read it here.
Wet Snow in Negro Canyon
Donner Summit Area
Date and time of observation:
Wed, 04/19/2017 - 12:15
United States39° 20' 39.7464" N, 120° 17' 37.7268" W
Recent loading by new snow, wind, or rain
Observation made by: Forecaster