Bingley: In my case, near the center of the NY/ NJ Metro area, I'm staying urban and in place, unless there is nuclear / chemical contamination or other such threat that requires immediate evacuation. Why, because Manhattan and the feeder roads/ rails/ airports are the locus of finance, communications, transportation and corporate HQs, in the USA and for a good chunk of the Western World. IMO, other than the Government center of Washington DC, that part of the NY/NJ Metro area is the next place the national and state governments are going to get up and running in a disaster. Except in the event of a multi-megaton direct hit, I cannot imagine a Black Swan event that changes that scenario.
I lived through 911 in this location and I held a peripheral governmental office which provided me some measure of knowledge concerning the movement of resources into Manhattan and the rerouting of transport around the stricken WTC site and lower Manhattan. It was the most intensive and impressive mobilization I have ever witnessed.