* WHAT. For the Heat Advisory, heat index values up to 108 expected. For the Excessive Heat Watch, dangerously hot conditions with heat index values up to 113 possible. * WHERE. Portions of southeast Louisiana and southern Mississippi. * WHEN. For the Heat Advisory, from 10 AM this morning to 7 PM CDT this evening. For the Excessive Heat Watch, from Sunday morning through Sunday evening. * 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.