Heavy lake effect snow will continue to hammer areas downwind of Lake Ontario through the weekend while dangerously cold temperatures grip the region, according to weather forecasts. A lake effect snow warning continues to be in effect until 7 p.m. Thursday for Cayuga and Oswego counties. The open waters of Lake Ontario are maintaining an intense snow band that is expected to bring an additional 1-2 feet of snow to Oswego County and nearly a foot to the northern tip of Cayuga County. Schools are again closed or delayed in Oswego County on Thursday. The snow band will shift southward across the lake by midday Thursday, spreading heavy snow along the entire southern shoreline of Lake Ontario through Saturday morning.