2 human triggered avalanches in the Headwall of Tuckerman Ravine this morning, both soft new wind slab. Chute: SS-ASu-R3-D1.5-I, Lip: SS-AFu-R3-D1.5-I. Both crown heights up to ~16”, mostly thinner. No one caught or carried.
~1″ of new snow overnight on WNW wind drifted to 3″ of soft snow in the GOS. Snow was light with almost enough density to keep skis from feeling the firm (P) bed surface below in most places, almost. Crampons necessary for the climb. Shiny bed . . .
New snow was reactive. Skier slough from first few turns triggered small wind slab that ran past ice bulge. 4-8″ crown, about 20ft wide. Perhaps R2 D1
Our trip to Ammo was rather interesting today, with a fair amount of surprises. As we skinned up, snow conditions in the bushes areas below varried from step to step. We left the main drainage and began skinning up the south basin of Ammo, which . . .
slope angle 25
15- bottom of pit P
SS Q2 @ 75CM
climbers in boot pack didn’t post hole or fracture surface layer
Appears to be a natural. We didn’t get high enough to get a close look as the surface was pencil hard in exposed terrain. Some soft turns were found in the woods though. Flume and Silver Cascade both had pockets of 4F however those are few and far . . .
The half inch of snow that fell on the summit Thursday blew in nicely on lee slopes. Soft snow is tucked into slopes here and there though firm snow beneath looked like it made the drop ins very exciting. Lots of firm snow in general, crampons would . . .
In the gully was quite stable bed surface from previous avalanching. We climbed and dug outside the track on the skiers left side. I found stability to be fair to good in our location (i.e. what you might call a pocket of moderate in a low . . .
Hand shears from lower Hitchcock below the rock step. All initiated while forming the block in pencil hard snow roughly 10 and 20 cm down.
Wind scouring at the top of Central Gully was so extreme that what snow was remaining was extremely firm and there was exposed water ice at the top of the gulley just before you top out (where there normally is just snow).