* WHAT. For the Excessive Heat Warning, dangerously hot conditions with heat index values up to 112 degrees. For the Heat Advisory, heat index values up to 110 degrees expected. * WHERE. Portions of south central and southwest Arkansas, north central and northwest Louisiana, southeast Oklahoma, and east and northeast Texas. * WHEN. For the Excessive Heat Warning, until 8 PM CDT this evening. For the Heat Advisory, from 8 PM this evening to 8 PM CDT Sunday. * IMPACTS. Heat related illnesses increase significantly during extreme heat and high humidity events.

* WHAT. Heat index values between 105 to 110. * WHERE. Portions of central, eastern, southeast, and southwest Arkansas. * WHEN. From 10 AM to 8 PM CDT Sunday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.

* WHAT. Heat index values up to 111. * WHERE. Portions of south central and southwest Arkansas, north central and northwest Louisiana, southeast Oklahoma, and east and northeast Texas. * WHEN. Until 8 PM CDT Sunday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.