Something is wrong with my swarm hive and I need your experience to help identify it.
I was going to the mailbox this afternoon and realized that something is wrong with my new swarm hive that's only 4 or 5 weeks old (I can't remember exactly). There is at least 3 or 4 times the normal activity at the hive while my established hive seems normal, and many bees are congregating around the crack where the top box (current brood box) meets the box under it, like they don't know where the entrance is.
Background: It has been raining fairly steadily for the past 3 days or so, we should be well into the spring flow. The rain has subsided this afternoon but it's still threatening to rain. There's only a bottom entrance on this hive and it is fully opened up. I have not been feeding them since the second week when they stopped sucking down the food.
My first thought was robbing, but after observing for a while I'm not seeing any fighting. My next thought was swarming, but I do see lots of bees entering the hive as well. The ratio is around 3 to 4 bees leaving the hive for every 2 to 3 bees entering the hive. My final thought was cleansing flights, but it's rained like this before and they were'nt acting like this, also, while some of the bees seem to take off and land again without going anywhere, many appear to be going the same direction as their normal foraging routes.
It's been three weeks since my last (and initial) inspection of this hive and at that time I did find eggs, and plenty of stores already being put away. I'm tempted to crack the cover for a quick inspection, but I'm not sure that's a good idea with it being so wet out and threatening to rain.
What do you think is going on? Do I need to take any quick action like closing up the entrance somewhat or putting a robber screen on?