* WHAT...Heat index values of 105 to 110 degrees are expected.
* WHERE...Portions of central, east central, northwest, southeast, southern, southwest, and western Oklahoma and northern Texas.
* WHEN...For the first Heat Advisory, until 9 PM CDT this evening. For the second Heat Advisory, from 11 AM to 9 PM CDT Sunday.
* IMPACTS...Hot temperatures and high humidity may cause heat illnesses.