Hurricane Sandy will most likely make landfall on the East Coast but forecasters are uncertain where exactly it will strike or with what kind of force it will come.
Combined with a colder weather system from the west, Sandy is expected to cause heavy rainfall and possibly make landfall with strong winds early next week.
James Franklin, branch chief of the National Hurricane Center, described it as a "very large system" on Friday and said it will likely last two to three days for most people.
Jeff Masters, meteorology director of the forecasting service Weather Underground, said it's looking like "a very serious storm that could be historic," as reported by CBS News.
Gov. Andrew Cuomo declared on Friday a state of emergency in New York in preparation for the storm.
"As we prepare for the possibility of Hurricane Sandy hitting New York State, I am activating all levels of state government to prepare for any potential impacts," Cuomo said. "We are working with federal and local partners to follow storm developments and organize a coordinated response plan. With unpredictable weather conditions, we are taking the greatest precautions - especially after our experience from last year's storms. I urge New Yorkers to plan for hurricane conditions and follow news reports to stay updated on the storm's progress."
MTA is monitoring the progress of Hurricane Sandy and advises customers to check its website for updates on service information.
Starting late Monday, the New York region is expected to see winds of 40 to 50 mph, according to the National Weather Service.
Sandy killed dozens in Haiti and 40 people in the Bahamas and is moving northward Friday night.
It will turn toward the north-northeast on Saturday and then toward the northeast on Sunday, before making a turn to the northwest early next week, with direct impacts expected for the Mid-Atlantic or Northeast U.S., the National Weather Service reported.