* WHAT. Dangerously hot conditions with heat index values of 110 to 115 degrees expected. * WHERE. Portions of central, east central, northern, southeast, and southern Oklahoma. * WHEN. From 11 AM this morning to 9 PM CDT this evening. * IMPACTS. Heat related illnesses increase significantly during extreme heat and high humidity events.

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

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