WWUS74 KTSA 190409 NPWTSA Heat Advisory National Weather Service Tulsa OK 1109 PM CDT Sat Jul 18 2026 ARZ129-220-OKZ055>058-060>062-064>067-070-071-074-176-254-272-354 /O.NEW.KTSA.HT.Y.0018.260719T1800Z-260720T0100Z/ North and Central Sebastian-Central and Southern Franklin-Washington-Nowata-Craig-Ottawa-Tulsa-Rogers-Mayes-Creek-Okfuskee-Okmulgee-Wagoner-Muskogee-McIntosh-Haskell-Northern Le Flore-Northeast Osage-Central and Southern Sequoyah-Southeast Osage ...HEAT ADVISORY IN EFFECT FROM 1 PM TO 8 PM CDT SUNDAY... * WHAT...Heat index values up to 106 expected. * WHERE...Portions of west central Arkansas and east central, northeast, and southeast Oklahoma. * WHEN...From 1 PM to 8 PM CDT Sunday. * IMPACTS...Heat related illnesses are possible especially impacting those not acclimated to the conditions or those performing strenuous activities. 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..