WWUS74 KTSA 170425 NPWTSA Heat Advisory National Weather Service Tulsa OK 1125 PM CDT Sun Aug 16 2026 ARZ119-120-129-219-220-229-OKZ049-053-070-071-073>075-172-176-272-276-376 /O.NEW.KTSA.HT.Y.0038.260817T1600Z-260818T0100Z/ Northern Crawford-Northern Franklin-North and Central Sebastian-Southern Crawford-Central and Southern Franklin-Southern Sebastian-Pushmataha-Choctaw-Muskogee-McIntosh-Pittsburg-Haskell-Latimer-Northern Sequoyah-Northern Le Flore-Central and Southern Sequoyah-Central Le Flore-Southern Le Flore ...HEAT ADVISORY IN EFFECT FROM 11 AM TO 8 PM CDT MONDAY... * WHAT...Heat index values up to 109 expected. * WHERE...Portions of northwest and west central Arkansas and east central and southeast Oklahoma. * WHEN...From 11 AM to 8 PM CDT Monday. * 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..