* WHAT. Dangerously hot conditions with heat index values up to 110 degrees expected. * WHERE. Portions of East Arkansas, North Mississippi, Southeast Missouri, and West Tennessee. * 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 108 degrees expected. * WHERE. Portions of North Mississippi and West Tennessee. * 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 111 degrees. For the Heat Advisory, heat index values up to 107 degrees expected. * WHERE. In Arkansas, Crittenden, Lee AR, and St. Francis Counties. In Mississippi, DeSoto County. In Tennessee, Fayette, Haywood, Shelby, and Tipton Counties. * WHEN. For the Excessive Heat Warning, until 9 PM CDT this evening. For the Heat Advisory, from 10 AM to 7 PM CDT Sunday. * IMPACTS. Heat related illnesses increase significantly during extreme heat and high humidity events.

* WHAT. For the first Heat Advisory, heat index values up to 108 degrees. For the second Heat Advisory, heat index values up to 109 degrees expected. * WHERE. Portions of North Mississippi and West Tennessee. * WHEN. For the first Heat Advisory, until 9 PM CDT this evening. For the second Heat Advisory, from 10 AM to 7 PM CDT Sunday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.

* WHAT. Dangerously hot conditions with heat index values up to 111 degrees. * WHERE. Portions of East Arkansas, Southeast Missouri, and West Tennessee. * WHEN. Until 9 PM CDT this evening. * IMPACTS. Heat related illnesses increase significantly during extreme heat and high humidity events.

* WHAT. For the first Excessive Heat Warning, dangerously hot conditions with heat index values up to 114 degrees. For the second Excessive Heat Warning, dangerously hot conditions with heat index values up to 113 degrees expected. * WHERE. In Arkansas, Phillips County. In Mississippi, Coahoma, Panola, Quitman, Tallahatchie, Tate, and Tunica Counties. * WHEN. For the first Excessive Heat Warning, until 9 PM CDT this evening. For the second Excessive Heat Warning, from 10 AM to 7 PM CDT Sunday. * IMPACTS. Heat related illnesses increase significantly during extreme heat and high humidity events.