Heat index values across the region will surge near or past 100 degrees Monday afternoon due to intense humidity. A Flash Flood Warning remains active for DeKalb and Rockdale counties as additional evening storms threaten strong winds. The combination of intense heat and moisture will push heat index values near or above 100 degrees. Emergency management officials issued a Flash Flood Warning for DeKalb and Rockdale counties until 4:45 p.m. Monday. What's next:If evening storms manage to form, they will bring a threat of strong winds.