 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 meteorologist Brian Vandegraaff in the First Start Weather Center. 71 now on the National Mall, 69 in Bethesda, and 67 in Reston. 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.