aurora77, only tiny bits of Manhattan are supposed to evacuate. Nevertheless, I suspect that the evacuation centers aren’t spacious enough to accommodate those who are supposed to evacuate from other areas. I assume people only go to those centers if they don’t have friends or relatives on higher ground who can take them.
I’m in an evacuation zone, but I’m far enough from the water that I’m not terribly worried. I believe most of the people on my block are also staying put. A local shul sent out an email that they’ll have two minyanim tomorrow morning, and the mikvah sent an email saying they have a generator and will stay open as usual.