I was listening to a weather expert on the radio yesterday (a REAL expert, not some talking head) and he was explaining how his whole career he's wondered when this will happen because it's happened before, back in the '50s. He was talking about it just being a matter of timing for just a few different variables to come together. He said he's seen the setup happen several times before but those storms veered just a bit left or right and didn't nail the magic combo that could flood out NY. But it's happened before and it'll happen again, so it isn't anything "new", it's just new to us because we haven't seen it happen in most of our lifetimes.