Snowpack on northerly aspects seemed stable (no propagation or slab-like features) while climbing the NE Buttress on Chair, but the avalanche on the East face slid on very similar terrain as the NE Buttress route. Appeared to slide all the way down on the rock slab. Also observed pockets of wind slab on North aspects below Chair, between the face and snow lake. A quick and dirty hand shear test produced a failure at about a 3cm depth, but we also observed several ski tracks from yesterday and today crossing several slabs with little evidence of any reactivity. Slab depth varied between 1cm and 5cm on the upper slopes right below the NF of Chair. There was strong SW wind coming over the ridge in the morning, but died off in the afternoon. Several rollerballs and very small wet loose avalanches were present anywhere the sun was exposed to the new snow for a couple hours or more.