 This is WFMD News. The National Weather Service has put a heat advisory in effect until 8 o'clock tonight with heat index values of up to 109 degrees. Hot temperatures and high humidity can cause heat illnesses to occur. The Weather Service reminds residents to drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances.