* WHAT...Heat index values up to 107 expected. * WHERE...Portions of southeast North Carolina and northeast South Carolina. * WHEN...From 11 AM this morning to 7 PM EDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS...The potential exists that showers and thunderstorms developing along the sea breeze will produce enough rain and cloud cover to prevent portions of the advisory area from reaching a heat index of 105F or greater.