On the ne face of sessions mountain at 9100' evidence of a large deep avalanche from prior to last storm- a guess would be during the strong sw component at the start of the 3/21 storm or perhaps from earlier than that even. HS-U-R3-D2.5-O large piles of blocky debris against trees and through runout. Crown face not desernable due to more recent storms and loading.

Forecaster Comments: Timing unknown but potentially from overnight Monday into Tuesday of this week.