There have been many seiches over the past few years that would top the current forecast of 10.1 ft. at Buffalo. The one I remember best was back on December 2, 1985 when the water level rose to 12.1 ft.
However, by far, the most destructive seiche that occurred in Buffalo's history was back on October 18, 1844 when it was estimated that a wall of water 22 ft. high inundated the city, including many. many boats anchored on the harbor as well as canal boats. Without a good breakwall to stop some of the force of that wall of water, it was estimated that over 70 people were drowned from that event. I can't even imagine a seiche of 22 ft. today!!