* WHAT...Air temperatures and/or heat index values up to 105 both days.
* WHERE...In Oklahoma, Beaver County. In Texas, Armstrong, Donley, Gray, Hemphill, Lipscomb, Palo Duro Canyon, and Wheeler Counties.
* WHEN...For the first Heat Advisory, until 9 PM CDT this evening. For the second Heat Advisory, from 1 PM to 8 PM CDT Friday.
* IMPACTS...Hot temperatures and high humidity may cause heat illnesses.