* WHAT. For the Heat Advisory, heat index values up to 105. For the Excessive Heat Warning, dangerously hot conditions with heat index values up to 111 expected. * WHERE. Portions of southeast Arkansas, northeast Louisiana, and central, north central, northwest, southwest, and west central Mississippi. * WHEN. For the Heat Advisory, until 8 PM CDT this evening. For the Excessive Heat Warning, from 10 AM Saturday to 8 PM CDT Sunday. * IMPACTS. Heat related illnesses increase significantly during extreme heat and high humidity events.

* WHAT. Heat index values up to 108 expected. * WHERE. Portions of central, east central, north central, northeast, south central, and southeast Mississippi. * WHEN. From 10 AM Saturday to 8 PM CDT Sunday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.

* WHAT. For the first Heat Advisory, heat index values up to 103. For the second Heat Advisory, heat index values up to 108 expected. * WHERE. Portions of central and southwest Mississippi. * WHEN. For the first Heat Advisory, until 8 PM CDT this evening. For the second Heat Advisory, from 10 AM Saturday to 8 PM CDT Sunday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.