* WHAT. Heat index values up to 110 expected. * WHERE. Portions of central, east central, northern, northwest, southeast, southern, and western Oklahoma. * WHEN. From 11 AM to 9 PM CDT Friday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.

* WHAT. Heat index values up to 110 expected. * WHERE. Portions of central, east central, northern, northwest, southeast, southern, and western Oklahoma. * WHEN. From 11 AM to 9 PM CDT Friday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.

* WHAT. Heat index values up to 109 expected. * WHERE. In Arkansas, Crawford, Franklin, and Sebastian Counties. In Oklahoma, Cherokee, Sequoyah, Delaware, Ottawa, Choctaw, Haskell, Latimer, Le Flore, Pittsburg, and Pushmataha Counties. * WHEN. From noon to 9 PM CDT Friday. * IMPACTS. Heat related illnesses are possible especially impacting those not acclimated to the conditions or those performing strenuous activities.

* WHAT. Dangerously hot conditions with heat index values up to 114 expected. * WHERE. Okfuskee, Craig, Creek, Osage, Pawnee, and McIntosh Counties. * WHEN. From noon to 9 PM CDT Friday. * IMPACTS. The combination of hot temperatures and high humidity will create a dangerous situation in which heat related illnesses are more likely.

* WHAT. Dangerously hot conditions with heat index values up to 114 expected. * WHERE. Muskogee, Mayes, Nowata, Okmulgee, Rogers, Tulsa, Wagoner, and Washington OK Counties. * WHEN. From noon to 9 PM CDT Friday. * IMPACTS. The combination of hot temperatures and high humidity will create a dangerous situation in which heat related illnesses are more likely.