* WHAT...For the first Heat Advisory, heat index values up to 107 expected. For the second Heat Advisory, heat index values up to 109 expected.
* WHERE...Portions of central, northwest, southeast, and southern Oklahoma.
* WHEN...For the first Heat Advisory, until 8 PM CDT this evening. For the second Heat Advisory, from noon to 8 PM CDT Tuesday.
* IMPACTS...Hot temperatures and high humidity may cause heat illnesses.