An additional 6-12 inches of snow is possible in more persistent lake effect snow bands across the Southern Tier especially on the Chautauqua Escarpment by Tuesday evening. Little or no additional accumulation is expected across the Buffalo-Niagara Falls metro.

Lake-effect snow typically happens in the late fall and early winter when the lakes are ice-free and the water is still relatively warm.

Lake effect snow is slamming the Great Lakes, with seven states from Wisconsin to New York under snow alerts on Monday.

Lake-effect snow blowing in from the Great Lakes has blanketed parts of Michigan, Ohio, Pennsylvania and New York, stranding hundreds of vehicles on roads and snarling post-Thanksgiving travel. Well over two feet of snow had fallen in many parts of the region by early Monday,