Speaking of dry slots, remember during the 2016 blizzard how that dry slot was racing N-NW out of eastern and central MD right towards us? (Lanco) The dry slot literally reached the M/D line JUST as the pivot took over and saved us. There were areas in NE MD that saw 12" less than we did all because they got dry slotted.
On the HRRR, it gets VERY close tomorrow evening.