Lake-effect snow from the Great Lakes will hit the Appalachians on Thursday and Friday, but by the time the cold front reaches Long Island it will have pretty much played itself out, said meteorologist David Stark with the Upton-based service.
"It's going to bring temperatures down a little bit, so we'll have cooler, breezier weather," Stark said. "But it will come through dry."
There's a slight chance of rain -- 20 percent to 30 percent -- Friday night and into Saturday morning for most of Long Island, the service said.
Otherwise, most of the weekend and into late Tuesday will consist of low temperatures from the mid 20s to mid 30s and highs of the mid 40s to low 50s.
Stark said the Great Lakes cold front likely will move north and west before it reaches Long Island. That means a chance of snow for portions of the Northeast and Canada, he said.
The clear, dry conditions for Long Island are replaced by cloudy skies and a 30 percent to 40 percent chance of rain starting Tuesday night, the service said.