Quick report
We went to ski the north face chutes on Mt Thoreau. Walked on mostly dry ground to Loch Leven at 10800. Straight into the boots and crampons from then onwards! On the way up the trail, we saw prior wet loose activity out of northerly chutes. Booting up the couloir, we found a small old wind slab about 1/3rd of the way up. We first noticed a hollow sound like a drum under our feet, and digging into it revealed a windslab of about 1-3cm with a thin layer of facets underneath. This slab was very small and isolated and did not reappear as we booted the rest of the couloir, so we felt comfortable proceeding. Hand shears showed easy separation with some cohesion in the slab. The snow inside the couloir from 10800 to 12200 was still very wintery / cold, and old wind-affected snow had faceted out a bit. The skiing was generally quite excellent, with some variable snow conditions encountered. The west side of the couloir was getting a bit warm and some areas were firmer unbreakable windboard, but it was mostly pow / facet pow. Coverage is pretty dire up there, but made the approach very easy!