Extreme Heat Warning

* WHAT...Dangerously hot conditions with heat index values up to 109 expected both today and Tuesday afternoon. Overnight heat indices will remain around 75 degrees, which will still be hazardous for anyone without shelter after the extreme heat in the afternoon.

* WHERE...Marathon, Portage, Waushara, Wood, Calumet, Winnebago, Brown, Outagamie, Shawano, and Waupaca Counties.

* WHEN...Until 7 PM CDT Tuesday.

* IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events.