You could rent a car and drive (doubt the storm is so bad once you are out of lake effect); might take 10 hours though to reach NYC. Chances are Toronto airport is open (it does not get lake effect snow and often is not affected when BUF is closed), there are buses to YYZ (take about 2 hours plus have to clear canadian immigration and customs). If I were truly desperate I'd go via YYZ (which has dozens of flights a day to NYC).