* WHAT. For the Heat Advisory, heat index values up to 107. For the Excessive Heat Warning, dangerously hot conditions with heat index values up to 112 expected. * WHERE. Portions of east central, southeast, southern, and southwest Oklahoma and northern Texas. * WHEN. For the Heat Advisory, until 9 PM CDT this evening. For the Excessive Heat Warning, from 11 AM to 9 PM CDT Wednesday. * IMPACTS. Heat related illnesses increase significantly during extreme heat and high humidity events.

* WHAT. For the first Heat Advisory, heat index values up to 109. For the second Heat Advisory, heat index values up to 110 expected. * WHERE. Portions of central, east central, northern, northwest, southeast, southwest, and western Oklahoma. * WHEN. For the first Heat Advisory, until 9 PM CDT this evening. For the second Heat Advisory, from 11 AM to 9 PM CDT Wednesday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.