* WHAT...For the Heat Advisory, heat index values up to 109 expected. For the Extreme Heat Warning, dangerously hot conditions with heat index values up to 115 expected. For the Extreme Heat Watch, dangerously hot conditions with heat index values up to 115 possible.
* WHERE...All of southeast Louisiana and southern Mississippi.
* WHEN...For the Heat Advisory, until 8 PM CDT this evening. For the Extreme Heat Warning, from 11 AM to 8 PM CDT Saturday. For the Extreme Heat Watch, from Sunday morning through Sunday evening.
* IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. Hot temperatures and high humidity may cause heat illnesses.