Did you have any regrowth of foliage after the storm? The same day most of my plants were shredded from a hail storm. All regrew during the rest of the summer and some even bloomed though later than usual.

Perennials are tough. Unless your plants were under water for a long time and roots rotted I expect they will be back this year.

I think they should be fine. Just give them a little time. I've had some take a real beating and they come back fine. Peonies are really hardy guys. Good Luck!