...HEAT ADVISORY REMAINS IN EFFECT UNTIL 7 PM CDT /8 PM EDT/ FRIDAY... * WHAT...Heat index values between 100 and 106. * WHERE...All of southern Illinois, southwest Indiana, western Kentucky, and southeast Missouri. * WHEN...Until 7 PM CDT /8 PM EDT/ Friday. * IMPACTS...Prolonged exposure to hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS...The first prolonged stretch of heat and humidity of the season will amplify health impacts. Health impacts will build with each successive day in the heat and humidity. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke. &&