* WHAT...Heavy lake effect snow. Additional snow accumulations 6 to 12 inches in the most persistent bands. Winds gusting as high as 40 mph will produce blowing and drifting snow and near whiteouts at times. Snowfall rates may reach 2 to 3 inches per hour at times in the strongest lake effect snow bands. * WHERE...Northern Erie and Genesee Counties. The greatest additional accumulations will be across the Buffalo Southtowns and southern Genesee County. * WHEN...Until 4 PM EST Wednesday. * IMPACTS...Whiteout conditions are expected and will make travel treacherous and potentially life-threatening. Roads, and especially bridges and overpasses, will likely become slick and hazardous. Travel will be difficult. The hazardous conditions will impact the morning and evening commutes.

* WHAT...Heavy lake effect snow. Heavy snow. Additional snow accumulations 6 to 11 inches with localized total snowfall amounts of 2 to 3 feet across southwest and central Erie County in the most persistent bands. Winds gusting as high as 40 mph will produce significant blowing and drifting with near whiteouts at times. Snowfall rates of 2 to 3 inches per hour in the most intense band. * WHERE...Wyoming, Chautauqua, Cattaraugus, and Southern Erie Counties. Greatest snow accumulation across southern Erie County, western Wyoming County, extreme northern Chautauqua County, and extreme northwest Cattaraugus County. * WHEN...Until 3 PM EST Wednesday. * IMPACTS...Whiteout conditions are expected and will make travel treacherous and potentially life-threatening. Travel will be very difficult in deep snow covered roads. Areas of blowing snow will significantly reduce visibility. The hazardous conditions will impact the morning and evening commutes. Gusty winds will down tree branches and cause isolated power outages.