* WHAT...For the Heat Advisory, heat index values up to 109 degrees. For the Extreme Heat Watch, dangerously hot conditions with heat index values up to 111 degrees possible.
* WHERE...Portions of East Arkansas, North Mississippi, Southeast Missouri, and West Tennessee.
* WHEN...For the first Heat Advisory and second Heat Advisory, until 6 AM CDT Wednesday. For the Extreme Heat Watch, from Wednesday morning through Thursday evening.
* IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. Hot temperatures and high humidity may cause heat illnesses.