 Now to 7U's first alert meteorologist, Mike Steneford. 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. Some of 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.