* WHAT. For the Heat Advisories, heat index values up to 109. For the Excessive Heat Warning, dangerously hot conditions with heat index values up to 115 expected. * WHERE. Portions of southeast Louisiana and southern Mississippi that are generally along and south of the Interstate 10/12 corridor away from the immediate Louisiana coast, and also near the Atchafalaya. * WHEN. For the Heat Advisory, until 7 PM CDT this evening. For the Excessive Heat Warning, from 10 AM to 7 PM CDT Sunday. * IMPACTS. Heat related illnesses increase significantly during extreme heat and high humidity events.

* WHAT. For the Heat Advisories, heat index values up to 109. For the Excessive Heat Warning, dangerously hot conditions with heat index values up to 115 expected. * WHERE. Portions of southeast Louisiana and southern Mississippi. * WHEN. For the Heat Advisory, until 7 PM CDT this evening. For the Excessive Heat Warning, from 10 AM to 7 PM CDT Sunday. * IMPACTS. Heat related illnesses increase significantly during extreme heat and high humidity events.

* WHAT. Heat index values up to 110 expected. * WHERE. Portions of central, south central, southwest, and west central Louisiana and southeast Texas. * WHEN. From noon today to 7 PM CDT this evening. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.