* WHAT. Heat index values of 110 to 115 are expected to develop this afternoon and again Saturday afternoon. * WHERE. Muskogee, Okfuskee, Craig, Creek, Mayes, Nowata, Okmulgee, Osage, Pawnee, Rogers, Tulsa, Wagoner, Washington OK, McIntosh, and Pittsburg Counties. * WHEN. Excessive Heat Warning until 9 PM CDT this evening and again from noon to 9 PM CDT Saturday. * IMPACTS. The combination of hot temperatures and high humidity will create a dangerous situation in which heat related illnesses are more likely.

* WHAT. For the Heat Advisory, heat index values 105 to 110. For the Excessive Heat Warning, dangerously hot conditions with heat index values 110 to 115 expected. * WHERE. In Arkansas, Crawford, Franklin, and Sebastian Counties. In Oklahoma, Cherokee, Sequoyah, Haskell, Latimer, and Le Flore Counties. * WHEN. For the Heat Advisory, until 9 PM CDT this evening. For the Excessive Heat Warning, from noon to 9 PM CDT Saturday. * 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 of 110 to 115 expected. * WHERE. Muskogee, Okfuskee, Craig, Creek, Mayes, Nowata, Okmulgee, Osage, Pawnee, Rogers, Tulsa, Wagoner, Washington OK, McIntosh, and Pittsburg Counties. * WHEN. From noon to 9 PM CDT Saturday. * 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 110 to 114 expected. * WHERE. In Arkansas, Crawford, Franklin, and Sebastian Counties. In Oklahoma, Cherokee, Sequoyah, Haskell, Latimer, and Le Flore Counties. * WHEN. From noon to 9 PM CDT Saturday. * 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 of 110 to 115 degrees expected. * WHERE. Portions of central, east central, northern, southeast, and southern Oklahoma. * WHEN. For the first Excessive Heat Warning, until 9 PM CDT this evening. For the second Excessive Heat Warning, from 11 AM to 9 PM CDT Saturday. * IMPACTS. Heat related illnesses increase significantly during extreme heat and high humidity events.