NEW : A hurricane warning is in effect for New York and nearby locales . NEW : Mandatory evacuations are ordered in parts of the city and Long Island . One expert says New York is out of practice with hurricanes . The storm has already caused flooding across much of the Northeast, including a major river breach that closed several bridges on Monday morning.
NEW : A hurricane warning is in effect for New York and nearby locales . NEW : Mandatory evacuations are ordered in parts of the city and Long Island . One expert says New York is out of practice with hurricanes . Millions of people could be trapped in their homes without power or transportation .