The unique nature of the storm is its scariest aspect. From the National Weather Service :
THE HIGH DEGREE OF BLOCKING FROM EASTERN NORTH AMERICA ACROSS THE ENTIRE ATLANTIC BASIN IS EXPECTED TO ALLOW THIS UNUSUAL MERGER TO TAKE PLACE, AND ONCE THE COMBINED GYRE MATERIALIZES, IT SHOULD SETTLE BACK TOWARD THE INTERIOR NORTHEAST THROUGH HALLOWEEN, INVITING PERHAPS A GHOULISH NICKNAME FOR THE CYCLONE ALONG THE LINES OF "FRANKENSTORM", AN ALLUSION TO MARY SHELLEY'S GOTHIC CREATURE OF SYNTHESIZED ELEMENTS.
Mayor Bloomberg has warned New Yorkers to be prepared for an evacuation.
In August, Bloomberg issued New York's first ever mandatory evacuation order to clear out flood prone parts of the city and shut down its subways.