Yeah. I'm in the Dulles area. I can confirm. For the past month I've watched storms and microbursts move around me the "highlight" being a microburst that hit Sterling a few miles to my north followed by the one that hit Franklin Farm, Reston, Vienna, etc. A couple miles to my south and southeast on August 13th.
Believe it or not I haven't mowed the grass since Saturday, July 17th (over 5 weeks). The recent rains have finally allowed the grass to grow enough that I will mow it tomorrow.