...HEAT ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT CDT /1 AM EDT/ MONDAY NIGHT... * WHAT...Heat index values of up to 105 to 110 degrees occurring this afternoon and peak afternoon heat indices of 100 to 105 degrees expected on Monday. * WHERE...Portions of central, east central, north central, and northeast Illinois and northwest Indiana. * WHEN...Until midnight CDT /1 AM EDT/ Monday Night. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS...Heat impacts will be worsened by consecutive days of hot and humid conditions, with overnight lows in the mid to upper 70s providing limited relief. 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. &&