WWUS74 KTSA 250414 NPWTSA Heat Advisory National Weather Service Tulsa OK 1114 PM CDT Mon Aug 24 2026 OKZ065-066-070-071 /O.EXA.KTSA.HT.Y.0044.260825T1700Z-260826T0100Z/ Okfuskee-Okmulgee-Muskogee-McIntosh ...HEAT ADVISORY IN EFFECT FROM NOON TO 8 PM CDT TUESDAY... * WHAT...Heat index values up to 109 expected. * WHERE...Muskogee, Okfuskee, Okmulgee, and McIntosh Counties. * WHEN...From noon to 8 PM CDT Tuesday. * 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..