* WHAT...Oppressively humid and very warm conditions with heat index values between 100 to 105 expected.
* WHERE...Bureau, Putnam, Carroll, Jo Daviess, Stephenson, and Whiteside Counties.
* WHEN...Until 10 PM CDT Monday.
* IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events.
* ADDITIONAL DETAILS...Little relief is expected tonight with low temperatures in the mid 70s.