This story has been updated.
The Winter Storm Watch for Westchester, Putnam and Rockland issued Saturday in advance of the major Nor'easter expected to arrive in the area on Monday night was upgraded to a Winter Storm Warning late Sunday afternoon.
A Blizzard Watch has been issued for Southern Westchester, New York City and Long Island, meaning there is a potential for falling and/or blowing snow with strong winds and extremely poor visibilities.
The warning and watch are in effect from 12 a.m. Tuesday to 12 a.m. Wednesday.
In advance of the storm, the National Weather Service has issued a rundown of what we know now in advance of the storm, saying there is potential for:
Shifts in the storm's track would have major importance:
A shift to the west closer to the coast would increase the potential for mixed precipitation/rain for the coast and lead to more snow inland.
A shift farther offshore to the east would increase the potential for heavy snow/blizzard conditions closer to the coast.
The major Nor'easter, expected to arrive overnight Monday into Tuesday, will bring with it heavy snow and gusty winds that could lead to power outages.
The National Weather Service is projecting between 12 and 18 inches of snowfall accumulation in Westchester, Putnam and Rockland before the storm wraps up early Wednesday.
This can lead to whiteout conditions and make travel very dangerous.
Monday will also be brisk with a high struggling to reach the freezing mark under partly sunny skies.
Snow is expected to arrive very late Monday night or in the early morning hours Tuesday with snow heavy at times during the day and snow showers lingering into Wednesday.
But there is still uncertainty surrounding the potential strength of the storm.
Be sure to check back to Daily Voice for updates on the timing and track of the Nor'easter.
Click here to sign up for Daily Voice's free daily emails and news alerts.