I hope your family is OK. The storm surge will push the river up too. I hope they are high enough.
We had a house on Galveston Bay. The houses were all built up on stilts. The old ones were 12 feet, the newer homes were 16 feet up.
Yes..I think they figured in the storm surge and all......should be ok even with St. Johns River closer than the ocean.....they’re 15 miles from the beach..in Duval Country.