* WHAT...Heat index values up to 109 expected.
* WHERE...Portions of south central and southwest Arkansas, north central and northwest Louisiana, southeast Oklahoma, and east and northeast Texas.
* WHEN...For the first Heat Advisory, until 7 PM CDT this evening. For the second Heat Advisory, from 10 AM to 7 PM CDT Wednesday.
* IMPACTS...Hot temperatures and high humidity may cause heat illnesses.