Heat Advisory

* WHAT...For the Heat Advisory today, heat index values up to 109. For the Extreme Heat Warning on Tuesday, dangerously hot conditions with air temperatures over 105 degrees and heat index values near 110 degrees.

* WHERE...Portions of east central, southeast, and southern Oklahoma.

* WHEN...For the Heat Advisory today, until 8 PM CDT this evening. For the Extreme Heat Warning, from 11 AM to 8 PM CDT Tuesday.

* IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. Hot temperatures and high humidity may cause heat illnesses.