Some avy activity around the summit of Lookout Peak. Wide (>1000 ft) avalanche on the northeast ridge of Lookout (first photo) looks to have been triggered naturally by a cornice fall. No tracks around it. Depth is a guess since we did not get close. A second, smaller avalanche just east of Grandview Peak (2nd photo; south-facing) was covered with snowmobile tracks. Not a stretch to say that one was human-triggered. Did not see either of these avalanches happen, so unsure of the timing. Both happened before mid-morning Sunday.