* WHAT. Heat index values up to 110. * 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 this evening. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.

* WHAT. Dangerously hot conditions with heat index values up to 110. * WHERE. Portions of south central and southwest Arkansas, north central and northwest Louisiana, southeast Oklahoma, and northeast Texas. * WHEN. Until 8 PM CDT this evening. * IMPACTS. Heat related illnesses increase significantly during extreme heat and high humidity events.

* WHAT. Heat index values up to 109. * WHERE. Portions of southwest Arkansas, northwest Louisiana, and east and northeast Texas. * WHEN. Until 8 PM CDT this evening. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.

* 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 111 expected. * WHERE. Portions of southwest Arkansas, north central and northwest Louisiana, southeast Oklahoma, and northeast Texas. * WHEN. For the Excessive Heat Warning, until 8 PM CDT this evening. For the Heat Advisory, from 8 PM Monday to 8 PM CDT Tuesday. * IMPACTS. Heat related illnesses increase significantly during extreme heat and high humidity events.

* WHAT. For the first Heat Advisory, heat index values up to 111. For the second Heat Advisory, heat index values up to 112 expected. * WHERE. Portions of northwest Louisiana and east and northeast Texas. * WHEN. For the first Heat Advisory, until 8 PM CDT this evening. For the second Heat Advisory, from 8 PM Monday to 8 PM CDT Tuesday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.

* WHAT. Dangerously hot conditions with heat index values up to 113. * WHERE. Union, Columbia, Lafayette, and Sevier Counties. * WHEN. Until 8 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 112. * WHERE. Union, Columbia, Lafayette, and Sevier Counties. * WHEN. Until 8 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 111 expected. * WHERE. Portions of southwest Arkansas, north central and northwest Louisiana, southeast Oklahoma, and northeast Texas. * WHEN. For the Excessive Heat Warning, until 8 PM CDT this evening. For the Heat Advisory, from 9 PM this evening to 8 PM CDT Tuesday. * IMPACTS. Heat related illnesses increase significantly during extreme heat and high humidity events.

* WHAT. For the first Heat Advisory, heat index values up to 111. For the second Heat Advisory, heat index values up to 112 expected. * WHERE. Portions of northwest Louisiana and east and northeast Texas. * WHEN. For the first Heat Advisory, until 8 PM CDT this evening. For the second Heat Advisory, from 9 PM this evening to 8 PM CDT Tuesday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.