* WHAT. Heat index values up to 110 expected. * WHERE. Portions of central, east central, northern, northwest, southeast, southern, southwest, and western Oklahoma and northern Texas. * WHEN. From noon today to 9 PM CDT this evening. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.

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

* WHAT. Heat index values up to 107. * WHERE. Portions of central, northern, northwest, and western Oklahoma. * WHEN. Until 9 PM CDT this evening. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.

* WHAT. For the first Excessive Heat Warning, dangerously hot conditions with heat index values up to 113. For the second Excessive Heat Warning, dangerously hot conditions with heat index values up to 111 expected. * WHERE. In Arkansas, Crawford, Franklin, and Sebastian Counties. In Oklahoma, Muskogee, Sequoyah, Mayes, Okmulgee, Rogers, Tulsa, Wagoner, Haskell, Le Flore, and McIntosh Counties. * WHEN. For the first Excessive Heat Warning, until 9 PM CDT this evening. For the second Excessive Heat Warning, from noon to 9 PM CDT Wednesday. * IMPACTS. The combination of hot temperatures and high humidity will create a dangerous situation in which heat related illnesses are more likely.

* WHAT. For the first Heat Advisory, heat index values up to 108. For the second Heat Advisory, heat index values up to 108 expected. * WHERE. In Arkansas, Benton, Carroll, Madison, and Washington AR Counties. In Oklahoma, Cherokee, Adair, Delaware, and Ottawa Counties. * WHEN. For the first Heat Advisory, until 9 PM CDT this evening. For the second Heat Advisory, from noon to 9 PM CDT Wednesday. * IMPACTS. Heat related illnesses are possible especially impacting those not acclimated to the conditions or those performing strenuous activities.

* WHAT. For the Excessive Heat Warning, dangerously hot conditions with heat index values up to 111. For the Heat Advisory, heat index values up to 108 expected. * WHERE. Okfuskee, Craig, Creek, Nowata, Osage, Pawnee, and Washington OK Counties. * WHEN. For the Excessive Heat Warning, until 9 PM CDT this evening. For the Heat Advisory, from noon to 9 PM CDT Wednesday. * IMPACTS. The combination of hot temperatures and high humidity will create a dangerous situation in which heat related illnesses are more likely.