* WHAT...Heavy snow expected. Total snow accumulations 9 to 15 inches. The highest amounts are expected along the Lake Ontario shore due to lake enhancement and across the higher terrain of southern Genesee County. * WHERE...Niagara, Orleans, Northern Erie, and Genesee Counties. * WHEN...Until 7 PM EST Monday. * IMPACTS...Travel will be very difficult. The hazardous conditions will impact the Monday morning and evening commutes. * ADDITIONAL DETAILS...The bulk of the heavy snow is expected to continue through tonight, with heavy snow persisting along the southern shore of Lake Ontario Monday.