...HEAT ADVISORY REMAINS IN EFFECT UNTIL 9 PM CDT THIS EVENING... ...EXTREME HEAT WARNING IN EFFECT FROM NOON TO 8 PM CDT MONDAY... * WHAT...For the Heat Advisory, heat index values up to 105. For the Extreme Heat Warning, dangerously hot conditions with heat index values up to 115 expected. * WHERE...Portions of northwest and west central Illinois, southeast Iowa, and northeast Missouri. * WHEN...For the Heat Advisory, until 9 PM CDT this evening. For the Extreme Heat Warning, from noon to 8 PM CDT Monday. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. Hot temperatures and high humidity may cause heat illnesses. 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. Do not leave young children and pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes. &&