* WHAT...Dangerously hot conditions with heat index values up to 111 expected.
* WHERE...Muskogee, Mayes, Okmulgee, Rogers, Tulsa, Wagoner, Haskell, McIntosh, and Pittsburg Counties.
* WHEN...From noon to 9 PM CDT Friday.
* IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events.