Heat Advisory

* WHAT...Heat index values up to 105 expected.

* WHERE...Alcona, Alpena, Arenac, Cheboygan, Gladwin, Iosco, Montmorency, Ogemaw, Oscoda, and Presque Isle Counties.

* WHEN...Until 8 PM EDT Wednesday.

* IMPACTS...Hot temperatures and high humidity may cause heat illnesses.

* ADDITIONAL DETAILS...Heat index values may locally exceed 105 degrees this afternoon. Although mid-week temperatures are dependent on thunderstorm development, prolonged high humidity and limited overnight cooling will lead to compounding heat stress throughout the week.