 at 11 a.m. with heat index values as hot as 100 to 105 degrees later on this afternoon. Now, the system responsible for bringing us some relief is going to bring a cold front to the area. Along and ahead of it, we could see some strong to severe storms capable of producing some heavy rainfall, which is why a flood watch goes into effect beginning at 2 p.m. I'm 7 News Meteorologist Mark Pena in the First Alert Weather Center. Right now, we have 79 in Upper Marlborough. It's 81 degrees already in Reston. We have 84 on the National Mall.