* WHAT...Dangerously hot conditions with heat index values up to 115 expected.
* WHERE...In Arkansas, Southern Crawford, Central and Southern Franklin, and North and Central Sebastian Counties. In Oklahoma, Central and Southern Sequoyah, Muskogee, Okmulgee, Haskell, McIntosh, and Northern Le Flore Counties.
* WHEN...From noon to 8 PM CDT Sunday.
* IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events.