 Tonight, 30 WFMD SkyScan forecast for Frederick and surrounding counties. There's a heat advisory in effect today from 11 a.m. through 8 p.m. We'll have scattered showers and thunderstorms. Look for a high of 97. The heat index, 106. We'll have showers and thunderstorms tonight with a low of 72. Thursday, look for scattered showers. We can have a thunderstorm in the afternoon. We'll have a mix of sun and clouds and a high of 87.