* WHAT...For the Heat Advisory, heat index values between 100 to 105 expected. For the Extreme Heat Watch, continued dangerously hot conditions possible with heat index values potentially between 100 to 110. * WHERE...Carroll, Jo Daviess, and Stephenson Counties. * WHEN...For the Heat Advisory, from 11 AM this morning to 9 PM CDT this evening. For the Extreme Heat Watch, from this evening through Monday evening. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events.