 At Leesburg, it's jumped up to 107 degrees, so it is dangerously warm outside. And that's going to be the story for the next couple of hours. Hot, muggy, scattered thunderstorms developing. Any storms that do develop may produce damaging winds, hail, even an isolated tornado. Also watch out for dangerous heat index values as high as 105 to 110. More showers and storms this evening ending after midnight. Once again, these storms could be severe. But behind the front overnight, turning cooler and less muggy are lows in the 60s.