Whumphs in Apex Slack Country

Went exploring on less than 25 degree slopes to check out conditions. In cutblocks the snow was wind affected and had multiple whumphs observed. Observed moderate shooting cracks; after the largest whumph, the slab cracked on either side of anchoring trees above us. Cracks were about 1 metre long. Avoided all avalanche terrain. Whumphs observed at 1600 metres and observed on northeast aspect on a cutblock