WWUS74 KTSA 161656 NPWTSA Extreme Heat Warning National Weather Service Tulsa OK 1156 AM CDT Sun Aug 16 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 ...HEAT ADVISORY WILL EXPIRE AT NOON CDT TODAY... ...EXTREME HEAT WARNING REMAINS IN EFFECT UNTIL 8 PM CDT THIS EVENING... * WHAT...Dangerously hot conditions with heat index values up to 112 expected. * WHERE...Portions of northwest and west central Arkansas and east central, northeast, and southeast Oklahoma. * WHEN...Until 8 PM CDT this evening. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. 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..