* WHAT...Dangerously hot conditions with heat index values up to 107 possible.
* WHERE...Marathon, Portage, Waushara, Wood, Calumet, Winnebago, Brown, Outagamie, Shawano, and Waupaca Counties.
* WHEN...From Monday afternoon through Monday evening.
* IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events.