I am a Hurricane Ridge Ski Patroller and toured in the POMA Bowl today. My partner and I observed a widespread avalanche cycle on the top 7 to 15 cm of snow on all aspects within the POMA bowl. In retrospect we should have measured the slope angles that didn't slide, but every slope of about 40 degrees slid, maybe less. The avalanches likely occurred towards the end of storm on 1/2/2020. Numerous slab avalanches, of the same nature, were observed while driving up the Hurricane Ridge road beginning at approximately the switchback trailhead. With our loupe observation, we could not find a significant difference in grain type between the top 10 cm and the snow below it, but the top 10 cm of snow was more cohesive, which allowed it to propagate. For example, the imprint of the skin keyhole in the tip of my ski remained cohesive while skinning. After this widespread avalanche cycle occurred, the overall snowpack stability was good. We did an unsupported ski cut test, on a test slope that had not slid. Our ski penetration of 30cm+ and was not reactive, but if I just kicked off the top 10 cm it was very reactive. Overall, this event, while interesting, didn't have a significant effect on stability on 1/3 or into the future because pretty much everything that could slide did. I would say D1, but R4 or R5.
Unrelated, but possibly relevant for later is that in the avalanche paths along the road, the slide alder is heavily weighed down in a way that I've rarely seen before, and before a warming and rain event popped it back loose. If the new snow from the current storm continues to build and keeps the alder laying down, avalanches starting from start zones on Klahanie Ridge may be more unobstructed than usual to flow to the road. Shades of 1999?