 They'll start to peter off in time for the fireworks. More of the same on Friday. Heat and humidity in the 90s. I'm 70s meter. I'll just start with Van de Graaff in the First Start Weather Center. 66 degrees in Manassas, 68 in Frederick, Maryland, 71 now at Metro Center. You're listening to WTOP, Washington's news, traffic, and weather station. The WTOP producer's desk is wired by IBEW Local 26, where electrical contractors come to grow.