That’s what I was thinking as well. Simply based on climo and the most recent guidance, I’m thinking more like 6-12” (or perhaps 5-10” per MillvilleWx) for the nearby north and west Baltimore suburbs such as Cockeysville, Owings Mills, and probably also Reisterstown, with the 12”+ totals north and west of a line from Hereford to Mt Airy.
I think @Ellinwood’s map is a better guess.