Winter Storm Watch: The National Weather Service issues this when conditions are favorable for a winter storm to begin within 48 hours. Issuance usually occurs at 36-48 hours before the event is expected to begin.

: Winter storm warnings issued for 8 counties expecting heavy snow Sunday MORE: Up to 10 inches of snow in possible ‘bomb cyclone’ winter storm Winter storm watches have been issued for eight counties in northern New Jersey as the state braces for a weekend storm system that could drop as much as 6 to 10 inches of snow in some areas and create dangerous road conditions across the region

Two forecast models demonstrate the uncertainty of the track and moisture that will determine how much wintry weather the Lowcountry sees starting on Tuesday.