The National Weather Service has expanded its winter storm warning to include Schoharie County and western Schenectady County.
The weather service had already issued a winter storm warning for the Adirondacks, the Lake George-Saratoga region and the western Mohawk Valley, including Fulton, Montgomery and Saratoga counties. All warnings run from 9 a.m. today to 1 a.m. Saturday.
A storm system moving northeast from the Ohio Valley this morning will bring 1 to 4 inches of snow and sleet, as well as a significant ice accumulation in excess of a half-inch to the warning areas.
Snow and sleet will overspread the area this morning, then warmer air will move in aloft during the afternoon, allowing the precipitation to transition to freezing rain. Some sleet may mix with freezing rain through the afternoon before turning to a cold rain by late afternoon or early evening.
As temperatures rise above the freezing mark, widespread significant ice accumulations of a half-inch will occur on top of the snow and sleet. This could result in power outages and very hazardous travel conditions.
Colder air will move back into the area overnight, changing the mixed precipitation back to snow.