We had a huge rain (3.5 inches in one hour) two nights ago and it has rained off and on since then. Yesterday, I noticed a few dead bees on the bottom board in Hive 2 and today I noticed a few more in Hive 1.
The most disturbing thing was the brood that I found out on the bottom board – partially formed brood. These had clearly died during their incubation. I am guessing this is due to the rain and hope this is only a minor setback.