...HEAT ADVISORY NOW IN EFFECT UNTIL NOON CDT THURSDAY... ...EXTREME HEAT WARNING IN EFFECT FROM NOON TO 8 PM CDT THURSDAY... ...HEAT ADVISORY IN EFFECT FROM 8 PM THURSDAY TO 8 PM CDT SATURDAY... * WHAT...For the first Heat Advisory, heat index values up to 110. For the Extreme Heat Warning, dangerously hot conditions with heat index values up to 111 expected. For the second Heat Advisory, heat index values up to 110 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. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. &&