Observations from Tallac

Evidence of widespread natural activity towards the end of recent storm.

pic 1: Skier's right of lower Corkscrew. Crown visible under cornice, extended well out of frame, >500ft wide, but didn't run very far down slope due to decrease in slope angle in main drainage.

pic 2: Small crown on convex roll in mid Corkscrew.

Pic 3: Flagging on trees whole width of N Bowl, no evidence of debris lower than midslope bench at 8000ft. No crown or flanks visible, so unknown if slab or loose avalanche.

Pic 4: Debris in N Bowl buried by additional storm snow. Debris remained soft and skiable.

None of this natural activity appeared to have stepped down to deeper weak layers.

Although all of upper N Bowl had slid, without obvious flanks or crown, it was easy based upon flagging on trees and depth of new snow to judge where storm snow remained undisturbed. In these areas, ski cuts, mitt pits and ECTs failed to show ongoing instability within the storm snow. 30-65cm of storm snow in undisturbed areas, 20cm of storm snow on top of bed surface (previous crust) and debris. HS below N Bowl ridgeline >400cm.

Roller balls and small point releases on solar aspects. N, NE aspects above 8000ft remained unconsolidated. Very light E wind was not observed to transport snow, even though surface snow all the way up to ridgetop on N Bowl remained light and available for transport.