* WHAT...For the Winter Weather Advisory, freezing rain expected. Total ice accumulations around a tenth or two on the Tug Hill Plateau, and up to a third of an inch through the Saint Lawrence Valley. For the Winter Storm Watch, heavy lake effect snow possible. Total snow accumulations over 7 inches possible in the most persistent lake snows. Winds could gust as high as 50 mph creating blowing and drifting snow and greatly reducing visibilities. * WHERE...The Eastern Lake Ontario Region. Greatest snow accumulation expected south of Watertown and Fort Drum. * WHEN...For the Winter Weather Advisory, from 4 PM Sunday to 10 AM EST Monday. For the Winter Storm Watch, from Monday afternoon through Thursday morning. * IMPACTS...Power outages and tree damage are likely due to the ice. Travel will be very difficult in deep snow covered roads beginning Monday afternoon. The hazardous conditions could impact the Monday morning and evening commutes. * ADDITIONAL DETAILS...Lake effect snow is expected oscillate several times downwind of Lake Ontario for this long duration event.