* WHAT...For the Heat Advisory, heat index values up to 110 expected. For the Extreme Heat Watch, dangerously hot conditions with heat index values up to 115 possible.
* WHERE...Portions of southeast Louisiana and southern Mississippi.
* WHEN...For the Heat Advisory, until 8 PM CDT this evening. For the Extreme Heat Watch, from Tuesday morning through Tuesday evening.
* IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. Hot temperatures and high humidity may cause heat illnesses.