New climate study: Too late to save more than 400 US cities from rising seas

[L.P. Hovercraft]

Better go visit New Orleans while it's still above water.
On the more hopeful side, reducing carbon emissions might still spare several coastal cities (including Jax) from rising sea levels:

The researchers warned that, under a "business-as-usual" scenario in which greenhouse gas emissions remain unchecked through the end of the century, then the total number of "locked-in" cities could grow to more than 1,500. However, if society somehow manages to achieve extreme carbon reductions, many cities could be saved, such as Jacksonville, Florida; Chesapeake, Norfolk, and Virginia Beach in Virginia; and Sacramento and Stockton in California.

http://www.rawstory.com/2015/10/its-too-late-to-save-more-than-400-us-cities-from-rising-seas-study/