 WFMD News. The National Weather Service has a heat advisory. It will remain in effect until 8 o'clock this evening. And there's a heat advisory in effect tomorrow from 11 a.m. until 8 p.m. For the first heat advisory, the heat index values will be up to 109 degrees. For the second heat advisory tomorrow, the heat index values will be around 105 degrees. Hot temperatures and high humidity may cause heat illnesses to occur.