 A dangerously hot and humid air mass covering the region. We can see heat index values of 105 to 110 as we go into the evening hours. The other big story, we've got a cold front coming in. And scattered thunderstorms will develop over the next several hours. So these storms could be severe. Damaging winds the main threat. But we can't rule out a tornado. Later tonight, showers and storms will end after midnight. Overnight, turning cooler and less muggy. Lows will be in the 60s. Sunshine, breezy, cooler and less muggy on Monday with a high near 80. And the pleasant weather will continue on Tuesday.