...Temperatures Gradually Returning to Seasonal Values... .Temperatures will return to more seasonal values as somewhat cooler air moves south across the southern half of Oklahoma and into north Texas. ...EXCESSIVE HEAT WARNING REMAINS IN EFFECT UNTIL 9 PM CDT THIS EVENING... ...HEAT ADVISORY REMAINS IN EFFECT FROM 9 PM THIS EVENING TO 8 PM CDT SUNDAY... * TEMPERATURES AND HEAT INDEX VALUES...105 to 110 degrees. * TIMING...Through Sunday. * IMPACTS...The excessive heat may quickly cause heat stress or heat stroke.