* WHAT...For the first Heat Advisory, heat index values up to 109 expected. For the second Heat Advisory, heat index values up to 110 expected.
* WHERE...In Oklahoma, Dewey, Ellis, Harper, Woodward, Custer, and Roger Mills Counties. In Texas, Archer and Wichita Counties.
* WHEN...For the first Heat Advisory, until 8 PM CDT this evening. For the second Heat Advisory, from noon to 8 PM CDT Friday.
* IMPACTS...Hot temperatures and high humidity may cause heat illnesses.