Extreme Heat Warning: Clay; Greene; Craighead; Poinsett; Mississippi; Cross; Crittenden; St. Francis; Lee; Phillips; Dunklin; Pemiscot; DeSoto; Tunica; Coahoma; Quitman; Lake; Obion; Weakley; Henry; Dyer; Gibson; Carroll; Benton; Lauderdale; Tipton; Haywood; Crockett; Madison; Chester; Henderson; Decatur; Shelby; Fayette; Hardeman; McNairy; Hardin

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Extreme Heat Warning — Clay; Greene; Craighead; Poinsett; Mississippi; Cross; Crittenden; St. Francis; Lee; Phillips; Dunklin; Pemiscot; DeSoto; Tunica; Coahoma; Quitman; Lake; Obion; Weakley; Henry; Dyer; Gibson; Carroll; Benton; Lauderdale; Tipton; Haywood; Crockett; Madison; Chester; Henderson; Decatur; Shelby; Fayette; Hardeman; McNairy; Hardin Severity: Severe. Certainty: Likely. * WHAT...For the first Heat Advisory, heat index values up to 109. For the Extreme Heat Warning, dangerously hot conditions with heat index values up to 112 expected. For the second Heat Advisory, heat index values up to 111 expected. * WHERE...Portions of East Arkansas, North Mississippi, Southeast Missouri, and West Tennessee. * WHEN...For the first Heat Advisory, until noon CDT Thursday. For the Extreme Heat Warning, from noon to 8 PM CDT Thursday. For the second Heat Advisory, from 8 PM Thursday to 8 PM CDT Saturday. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. Hot temperatures and high humidity may cause heat illnesses.