 Mostly to partly sunny for Friday, near 85 degrees. Saturday, a chance for a pop-up shower or thunderstorm near 90 with feels like temperatures around 95 to 100 degrees. Sunday, hotter yet, chance for stronger thunderstorms. Heat index values 100 to 105. Could be looking at some heat alerts for the day. We'll keep you updated. I'm 7 News meteorologist Steve Rudin in the First Alert Weather Center. Sunshine 87, Annandale 88 degrees at DuPont Circle.