Hurricane Sandy was spawned over the very hot (over 85 degrees F) waters of the southern Caribbean. It tracked up the warmest parts of the Gulf Stream (still over 80 degrees) until it fell into a loop in the Arctic Jet Stream and a negatively tilted low pressure trough that turned it inland where it made landfall at the astronomical high tide.
Or, you can believe any of these alternative theories.
God's Punishment for Gay Marriage
Allah the Film Critic
Barack and the Hurricane Machine
Iran and the Hurricane Machine
weather weapons to create a drought in Iran.