WWUS74 KTSA 251713 NPWTSA Extreme Heat Warning National Weather Service Tulsa OK 1213 PM CDT Sat Jul 25 2026 OKZ058-059-064>066-070-071-154-254-354 /O.CON.KTSA.XH.W.0004.000000T0000Z-260726T0100Z/ Ottawa-Pawnee-Creek-Okfuskee-Okmulgee-Muskogee-McIntosh-Western Osage-Northeast Osage-Southeast Osage ...HEAT ADVISORY IN EFFECT FROM NOON TO 8 PM CDT SUNDAY... ...EXTREME HEAT WARNING REMAINS IN EFFECT UNTIL 8 PM CDT THIS EVENING... * WHAT...For the Extreme Heat Warning Saturday, dangerously hot conditions with heat index values up to 113. For the Heat Advisory Sunday, heat index values up to 109 expected. * WHERE...Muskogee, Okfuskee, Creek, Northeast Osage, Okmulgee, Ottawa, Pawnee, Southeast Osage, Western Osage, and McIntosh Counties. * WHEN...For the Extreme Heat Warning Saturday, until 8 PM CDT this evening. For the Heat Advisory Sunday, from noon to 8 PM CDT Sunday. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. Heat related illnesses are possible especially impacting those not acclimated to the conditions or those performing strenuous activities. Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Do not leave young children and pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes. 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..