A Winter Storm Warming is in effect for Northern Herkimer, Oneida, and Madison Counties for Monday evening through Tuesday morning. A winter weather advisory is in effect for Southern Herkimer, Chenango, Otsego, Fulton, and Montgomery Counties.
A Winter Storm Warning is issued when heavy snow accumulates either 6 inches in 12 hours or 8 inches in 24 hours. This is the case for Northern Herkimer County, areas in the Adirondacks, and along Lake Ontario.
A Winter Storm Watch is issued when a winter storm is likely a threat to life or property due to some type of hazardous weather. This includes heavy snowfall, low visibility, snow covered or icy roads, heavy freezing rain or sleet. This is the case for areas especially South of the Mohawk Valley. These areas will see a mix of rain and snow Monday with the possibility of some freezing rain Monday night creating slick roads on top of heavy snowfall by Tuesday morning.
By Tuesday afternoon, total snowfall accumulations will vary across the state. North and West of the Mohawk Valley will pile up about 6 to 9 inches of snow. The Mohawk Valley will see about 3 to 6 inches of snow. Areas South of the Mohawk Valley will have a glaze of ice and about 1 to 3 inches of snow.
The latest snowfall forecast can be found here: