 Heat warning beginning at 11 a.m. lasting until about 8 p.m. Also tracking the chance at a few showers and storms later, some of which could be on the strong to severe side with heavy rain, gusty winds and frequent lightning in the forecast. I'm 7 News meteorologist Mark Pena in the First Alert Weather Center. 80 degrees in Reston, 83 degrees Bethesda, 86 degrees on the National Mall. 1230.