* WHAT. Dangerously hot conditions with heat index values up to 113 expected. * WHERE. Portions of central, east central, southeast, and southwest Oklahoma. * WHEN. From 11 AM this morning to 9 PM CDT this evening. * IMPACTS. Heat related illnesses increase significantly during extreme heat and high humidity events.

* WHAT. Dangerously hot conditions with heat index values up to 115 expected. * WHERE. Portions of east central, southeast, southern, and southwest Oklahoma and northern Texas. * WHEN. From 11 AM this morning to 9 PM CDT this evening. * IMPACTS. Heat related illnesses increase significantly during extreme heat and high humidity events.

* WHAT. Heat index values up to 109 expected. * WHERE. Portions of northern, northwest, and western Oklahoma. * WHEN. From 11 AM this morning to 9 PM CDT this evening. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.

* WHAT. Dangerously hot conditions with heat index values up to 110. * WHERE. Blaine, Beckham, and Washita Counties. * WHEN. Until 9 PM CDT this evening. * IMPACTS. Heat related illnesses increase significantly during extreme heat and high humidity events.

* WHAT. Dangerously hot conditions with heat index values up to 111. * WHERE. Canadian, Cleveland, Grady, Kingfisher, McClain, Oklahoma, and Caddo Counties. * WHEN. Until 9 PM CDT this evening. * IMPACTS. Heat related illnesses increase significantly during extreme heat and high humidity events.

* WHAT. Dangerously hot conditions with heat index values up to 113. * WHERE. Portions of east central, southeast, southern, and southwest Oklahoma and northern Texas. * WHEN. Until 9 PM CDT this evening. * IMPACTS. Heat related illnesses increase significantly during extreme heat and high humidity events.

* WHAT. Dangerously hot conditions with heat index values up to 110. * WHERE. Canadian, Cleveland, Kingfisher, McClain, Oklahoma, and Blaine Counties. * WHEN. Until 9 PM CDT this evening. * IMPACTS. Heat related illnesses increase significantly during extreme heat and high humidity events.

* WHAT. For the Excessive Heat Warning, dangerously hot conditions with heat index values up to 112. For the Heat Advisory, heat index values up to 109 expected. * WHERE. Grady, Caddo, Beckham, and Washita Counties. * WHEN. For the Excessive Heat Warning, until 9 PM CDT this evening. For the Heat Advisory, from 11 AM to 9 PM CDT Thursday. * IMPACTS. Heat related illnesses increase significantly during extreme heat and high humidity events.

* WHAT. For the Excessive Heat Warning, dangerously hot conditions with heat index values up to 113. For the Heat Advisory, heat index values up to 109 expected. * WHERE. Portions of southeast, southern, and southwest Oklahoma and northern Texas. * WHEN. For the Excessive Heat Warning, until 9 PM CDT this evening. For the Heat Advisory, from 11 AM to 9 PM CDT Thursday. * IMPACTS. Heat related illnesses increase significantly during extreme heat and high humidity events.