The March 20/21 of 2018? .5 ice from first part and my notes say I slid in at 5" for the second part, which I had totally forgotten about. Course, I hate March snow after the 15th, so that's probably why I memory-holed it.
So looking for the first verified warning level snow in Balt City prior to March 20 since January of 2016 would be more accurate.