An earthquake could level your house and cause gas leaks in a few seconds. The New England area hasn't had a big one in a looong time (
http://www.nesec.org/hazards/earthquakes.cfm). It would also affect a larger area because we are not on a fault line. Also an ice age like winter would also be a natural disaster (worse than the blizzard of 78). Just some things for you to think about. I know I don't have enough water, food, or fuel to warrant trying to wait anything major out. You have to know what you're ready for, if you can hold up for several months than that's good for YOU... not me
additionally, when you realize you can't hold up any longer would you already be out of supplies (too late to leave)?