WWUS74 KTSA 160431 NPWTSA Extreme Heat Warning National Weather Service Tulsa OK 1131 PM CDT Sat Aug 15 2026 ARZ129-219-OKZ055>058-060>067-070-071-073-074-176-272-354 /O.CON.KTSA.XH.W.0014.260816T1700Z-260817T0100Z/ North and Central Sebastian-Southern Crawford-Washington-Nowata-Craig-Ottawa-Tulsa-Rogers-Mayes-Delaware-Creek-Okfuskee-Okmulgee-Wagoner-Muskogee-McIntosh-Pittsburg-Haskell-Northern Le Flore-Central and Southern Sequoyah-Southeast Osage ...EXTREME HEAT WARNING REMAINS IN EFFECT FROM NOON TO 8 PM CDT SUNDAY... ...HEAT ADVISORY REMAINS IN EFFECT UNTIL NOON CDT SUNDAY... * WHAT...For the Heat Advisory, heat index values up to 105 expected. For the Extreme Heat Warning, dangerously hot conditions with heat index values of 110 to 115 expected. * WHERE...Portions of northwest and west central Arkansas and east central, northeast, and southeast Oklahoma. * WHEN...For the Heat Advisory, until noon CDT Sunday. For the Extreme Heat Warning, from noon to 8 PM CDT Sunday. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. Heat related illnesses are possible especially impacting those not acclimated to the conditions or those performing strenuous activities. Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke..