My booming Russian/Carniolan hive threw a swarm yesterday which I managed to hive after a few exciting moments. Now I'll just hope they remain in the hive and may give them a frame of brood, a hivetop feeder and confine them later today to increase the chances of them staying put. As it is, they only have two old drawn combs with eight frames of foundation, so I'm nervous about them accepting their new digs as is.
This is as early a swarm as I've ever seen in these parts. The weather has been absolutely bizarre with 5.5 inches of rain followed by sleet and snow last Sunday into Monday and then yesterday it got up to 80F and out they came. I knew I had to get in this hive and open up the brood nest but with this crazy weather and work, I didn't get a chance to do so in time to prevent swarming. I have a bait hive (5-frame nuc) about 9 feet up in a nearby locust tree and on 4/20 when I got home from work there were about a dozen scouts checking it out, so I knew I was too late to prevent a swarm and that I should expect one soon.
Looking at the parent hive, you could hardly guess they just lost 2-3 lbs of bees, so I realize there is a good chance they could issue additional swarms unless I significantly open up the brood nest (2-4 frames). If the bait hive is any indication, there will be another swarm very shortly since there are now about 25 scouts checking it out.