 A line of strong storms expected to develop as we move through the late afternoon and into the evening. A severe thunderstorm watch has now been posted until 10 p.m. On top of that, we're dealing with extreme heat. An excessive heat warning until 8 o'clock feels like temperatures between 100 and 110 degrees. In terms of the storms, some may produce some gusty winds and heavy downpours, along with a low-end tornado that's mainly north of D.C. Once we get through all of that, tomorrow we're a little bit cooler. I'm 7 News meteorologist Steve Rudin in the First Alert Weather Center.