Miami is doomed.

[happyslug]

9. Norfolk is fairely high in attitude, about

In fact when Cornwallis moved into Virginia in 1781, he went to Norfolk for it was defensible, for it was higher then the surrounding lands. Norfolk being on high grounds can be defended even if the attacking forces have more troops. Cornwallis only moved to Yorktown when he was assured he would have additional troops from New York AND the British Fleet. Yorktown is lower then the surrounding land and thus takes more men to hold then to take. The movement of the troops and the fleet was stopped by the French Fleet and Cornwallis was doomed.

While Norfolk is more defensible then Yorktown, it is a lousy base to attack Virginia from, any force has to go south, then west then north (or cross the water). On the other hand Yorktown is an excellent base to attack Virginia from and why Cornwallis went to Yorktown (Followed by McClellan in 1862 and Grant in 1864).

Anyway, with a 7 meter (about 20 feet) sea level rise, Norfolk still would have dry spots, through it would also be mostly under water. See the following map:

http://flood.firetree.net/?ll=36.6159,-76.2034&zoom=9

7 Meters is what is expected if the West Antarctic Ice Sheet (WAIS) collapses, and its collapse is not a question of if, but when. WAIS will collapse some late March (When the Surrounding Ice Shelves are at their minimum) and by Easter, world wide sea levels will be 7 meter higher then it is now.