* WHAT...For the first Heat Advisory, heat index values up to 107. For the second Heat Advisory, heat index values up to 108 expected.
* WHERE...Portions of central, northern, northwest, and western Oklahoma.
* WHEN...For the first Heat Advisory, until 9 PM CDT this evening. For the second Heat Advisory, from noon to 9 PM CDT Friday.
* IMPACTS...Hot temperatures and high humidity may cause heat illnesses.