 This is 930 WFMD and WFMD.com. Now, WFMD News. The National Weather Service says a heat advisory remains in effect until 8 o'clock tonight, and a heat advisory will go into effect tomorrow from 11 a.m. until 8 p.m. During a heat advisory, hot conditions with heat index values around 105 are expected. Hot temperatures and high humidity can cause heat illnesses to occur.