* WHAT...FOR THE HEAT ADVISORY, HEAT INDEX VALUES UP TO 110F DEGREESDURING THE DAYTIME, WITH LIMITED HEAT RELIEF OVERNIGHT. FOR THE EXTREME HEAT WARNING, DANGEROUSLY HOT CONDITIONS WITH HEAT INDEX VALUES UP TO 115F DEGREES, WITH LIMITED HEAT RELIEF OVERNIGHT.

* WHERE...PORTIONS OF SOUTHEAST ARKANSAS, NORTHEAST LOUISIANA, AND NORTH CENTRAL MISSISSIPPI.

* WHEN...FOR THE HEAT ADVISORY, UNTIL 10 AM CDT TUESDAY. FOR THE EXTREME HEAT WARNING, FROM 10 AM TO 9 PM CDT TUESDAY.

* IMPACTS...HEAT RELATED ILLNESSES INCREASE SIGNIFICANTLY DURING EXTREME HEAT AND HIGH HUMIDITY EVENTS.