Carol,
I would recommend you open that hive up and check every frame. It might be nothing more than nothing was in bloom and due to a shortage, they kicked them out. You may also have a queen problem. Look at your brood and the quantity of the drone cells. Look at the wings of the drones. Good chance they are deformed which would cause the bees to kick them out. If that is the case, check the wings of your queen. My first nuc queen had DFV (deformed wing virus) and most of the drones she produced had it, there were no workers once the original brood hatched out. Don't wait long, inspect this hive once this storm passes. Good luck.
Jim