Shoppers stock up on water from rapidly emptying shelves in Far Rockaway, N.Y., Thursday. New York Mayor Michael R. Bloomberg urged residents living in low-lying areas to line up a place to stay on high ground ahead of a possible evacuation. (Associated Press)

Shoppers stock up on water from rapidly emptying shelves in Far Rockaway, N.Y., Thursday. New York Mayor Michael R. Bloomberg urged residents living in low-lying areas to line up a place to stay on high ground ahead of a possible evacuation. (Associated Press)