 Good afternoon, I'm Anne Kramer. And I'm Kyle Cooper. Coming up... Record-breaking heat gives way to thunderstorms in parts of Montgomery and Loudoun counties this hour. Stay with Washington's weather station, WTOP, for the very latest. More breaking news from the Republican National Convention where Donald Trump has been officially nominated and has chosen Senator J.D. Vance as his running mate. And Vance was on the convention floor just a little while ago shaking hands and taking selfies. We will go in-depth with ABC News correspondent Stephen Portnoy in Milwaukee at 5.15. It's reached a boiling point.