* WHAT...Air temperatures between 100 and 108 each afternoon, with heat indices between 105 and 110. Low temperatures only drop to about 80 each morning.
* WHERE...Portions of central, east central, northern, northwest, southeast, southern, southwest, and western Oklahoma and northern Texas.
* WHEN...Until 8 PM CDT Friday.
* IMPACTS...Hot temperatures and high humidity may cause heat illnesses.