...EXCESSIVE HEAT WARNING IN EFFECT FROM NOON TO 8 PM CDT MONDAY... The National Weather Service in Tulsa has issued an Excessive Heat Warning, which is in effect from noon to 8 PM CDT Monday. * HEAT INDEX...Afternoon heat index values from 110 to 113 degrees expected. * TEMPERATURE...Low to mid 90s. * IMPACTS...The combination of hot temperatures and high humidity will create a dangerous situation in which heat illnesses are possible.