A quick look at radar around 6:00 last night seemed to suggest that one cell would miss Towson to the northwest and another would miss Towson to the southeast. Then, around 6:30 it started to pour buckets. Seems as if the two cells merged over the area then trained for some time. Have no idea how much rain, but my little back yard pond hole that I have been digging seemed 1/4 full of water (muddy mess today). We even had another round of storms sometime after midnight.
Beautiful morning now with much lower humidity!!