Hand shear tests identified a small wind slab that was starting to form on N facing aspects when going up the Henry Creek drainage area. There was a lot of N wind (going between NE, N, and NW wind) blowing surface snow around yesterday (gusts estimated around 15+mph). The hand shear broke in a planar manner down low though, so I wasn't super concerned about pushing further.
Creek holes were opening up down lower (around 3k'); I accidentally postholed several times going off an old downtrack in the morning and one of the areas I postholed ate my entire leg (about 2').
More details: https://www.wta.org/go-hiking/trip-reports/trip_report-2021-04-14-2758958334
Observed Avalanche Problem #1:
Observed old wet loose debris (D1) on W facing aspects lower down the Henry Creek drainage and the S face of the Jim Hill Mountain ridge down a col.
Observed Avalanche Problem #2:
Lots of cornices along the summit ridge of varying size/overhangs.
Observed Avalanche Problem #3:
Ran into small isolated wind slabs up higher (5.75k'~6k') (see hand shear test pic).