This is a mixture of storms from growing up in South Bend, and now living in Cincy/Northern KY for the last 12 years:
#1 - March 9-11, 1998...SBN picked up 15.8 over the 3 days, most of it on the 9th, with just scattered lake effect the next 2 days. The main show was ferocious, and I remember this being a sneaky one. Like Hoosier said, it came out of nowhere, with nothing significant in the forecast until Sunday night, before the storm hit on a Monday morning.
#2 - The Odd Year February Storms...In 3 consecutive odd years ('91, '93, & '95), we picked up a heavy lake effect snow in February. 2/14-2/16/91 was 19.8"...2/22-2/24/93 was 20.1"...and 2/4-2/8/93 was 22.6". My most vivid memory of the 3, was the last one in 1995. The first part actually under-preformed, as the prediction was for up to 3 feet, and we only picked up about a foot. But then the last couple of days, featured an hour of probably the heaviest snow I've ever seen...about 5 inches in an hour on the evening of 2/7. I imagine this was probably some kind of meso-low or something, but back then, I had no clue what that was.
#3 - 2/13/2007 Ice Storm...This was looking like a close miss, with much of the Midwest getting hammered, while we picked up an inch of 35 degree rain. Even up to the start of the event, the forecast was for just a cold rain. However, things never warmed up at the surface, and instead, produced about 2/3 to 3/4 in. of ice. Substantial power outages all across the area, this is still the most impactful event in my 12 winters down here.
#4 - Blizzard of 2008 (March 7-8)...This was a good one, though not quite the monster it was for central Ohio. 10.7" at CVG, and it was more in the 12-14 inch range, where I lived, just a few miles south of the airport. This is one of only 7 two-day snowfalls over 10 inches, in the history of official Cincinnati reporting sites in the last 125 years, and only the 5th double-digit snow at CVG, since 1948. So yeah, that is pretty significant.
#5 - January 15-16, 1997...I just remember this one, cause we got out on an early dismissal, which I think is the only time that ever happened in my life. Windy storm, with about 15 inches, which ushered it some pretty big cold air.