Extreme Heat Watch: Clay; Greene; Craighead; Poinsett; Mississippi; Cross; Crittenden; St. Francis; Lee; Phillips; Dunklin; Pemiscot; DeSoto; Marshall; Benton; Tippah; Alcorn; Tishomingo; Tunica; Tate; Prentiss; Coahoma; Quitman; Panola; Tallahatchie; 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 Watch — Clay; Greene; Craighead; Poinsett; Mississippi; Cross; Crittenden; St. Francis; Lee; Phillips; Dunklin; Pemiscot; DeSoto; Marshall; Benton; Tippah; Alcorn; Tishomingo; Tunica; Tate; Prentiss; Coahoma; Quitman; Panola; Tallahatchie; 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 Heat Advisory, heat index values up to 109. For the Extreme Heat Watch, dangerously hot conditions with heat index values up to 112 possible. * WHERE...Portions of East Arkansas, North Mississippi, Southeast Missouri, and West Tennessee. * WHEN...For the Heat Advisory, until 6 AM CDT Wednesday. For the Extreme Heat Watch, from Wednesday morning through Thursday evening. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. Hot temperatures and high humidity may cause heat illnesses.