NEW YORK, Oct 29 (Reuters) - U.S. equity markets are unlikely to open on Tuesday as Hurricane Sandy bears down on the New York area, a senior exchange official at one of the major exchanges told Reuters on Monday.

A decision has not been made yet, but with the hurricane closing in and metro-area transit systems closed, it is highly likely that U.S. equity trading on the New York Stock Exchange and Nasdaq Stock Markets will remain closed.