That exact same paragraph is carried over to this morning's AFD. "Latest guidance"?
NWS and CWG disagree on storm chances today: NWS has a 40% pop for central Fairfax, CWG downplays it: "Can't rule out an isolated evening storm, especially north and northwest of the Beltway." Decided to live dangerously and leave the umbrella at home; let's see how that works out.