WWUS74 KTSA 201711 NPWTSA Extreme Heat Warning National Weather Service Tulsa OK 1211 PM CDT Mon Jul 20 2026 ARZ129-219-220-OKZ055>058-060>062-066-067-070-071-074-176-272 /O.NEW.KTSA.XH.W.0002.260720T1800Z-260721T0100Z/ North and Central Sebastian-Southern Crawford-Central and Southern Franklin-Washington-Nowata-Craig-Ottawa-Tulsa-Rogers-Mayes-Okmulgee-Wagoner-Muskogee-McIntosh-Haskell-Northern Le Flore-Central and Southern Sequoyah ...EXTREME HEAT WARNING IN EFFECT UNTIL 8 PM CDT THIS EVENING... ...EXTREME HEAT WARNING IN EFFECT FROM NOON TO 8 PM CDT TUESDAY... * WHAT...For the first Extreme Heat Warning, dangerously hot conditions with heat index values up to 111 expected. For the second Extreme Heat Warning, dangerously hot conditions with heat index values up to 113 expected. * WHERE...Portions of northwest and west central Arkansas and east central, northeast, and southeast Oklahoma. * WHEN...For the first Extreme Heat Warning, until 8 PM CDT this evening. For the second Extreme Heat Warning, from noon to 8 PM CDT Tuesday. * 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..