Toured up Willow Knob to the PC ridgeline today. Scattered skies, light winds at lower elevations, and moderate winds out of the south at ridge tops. Surprisingly warm day with snow surfaces warming up on southerlies even on windy ridge tops. Some minor rollerball activity observed but also a significant natural R2-D2 persistent slab on the SE aspect of South Monitor. Likely a warming induced natural. See other observation for more details.

Dug a test pit in the flank of an avalanche on the NE aspect of South Monitor that occurred January 30th. The avalanche stepped down to facets from a smaller wind slab. Pit was on a NE aspect, 9750 ft, 30 degree slope, HS 145 cm. ECTP28 down 85 cm on the December facets. This is the same layer that the adjacent avalanche failed on. Also observed an ECTN down 55 cm on a layer of intact buried surface hoar.