* WHAT...For the first Heat Advisory, heat index values up to 106 expected. For the second Heat Advisory, heat index values up to 108 expected. * WHERE...In Arkansas, Benton, Carroll, Madison, Northern Crawford, Washington AR, and Northern Franklin Counties. In Oklahoma, Cherokee, Northern Sequoyah, and Adair Counties. * WHEN...For the first Heat Advisory, until 8 PM CDT this evening. For the second Heat Advisory, from noon to 8 PM CDT Tuesday. * IMPACTS...Heat related illnesses are possible especially impacting those not acclimated to the conditions or those performing strenuous activities.