Nch'Kay- Atwell NW Face Obs

Jan 5th low level cloud gave some spectacular visuals of Nch'Kay Massif. Notable was the appearance of a mid season snow pack in extremely steep terrain. Based on many years of Obs up there. Rock is caked with Rind. I departed to building N wind as sun set behind Tantalus Range. Returned Jan 6th and observed 2 large crowns on the North Face. Suspect Cornice Failure trigger during the night with propagation into the neighboring Couloir. Avalanche info are estimates. Runout obscured by landscape. We rode N facing low angle supported terrain and found excellent winter conditions.