In front of one colony there appeared to be a commencing swarm...thousands of bees circling around. Left the yard for a few minutes to gather a box to maybe lure the swarm...as I returned all looked normal...looked as though the swarm had already happened. Did not locate a swarm in the surrounding area. Upon inspection of the hive I found it still loaded with bees. The weather has been warm here with the exception of a few nights.