 1023 KRMG. Tulsa's News and Talk has Tulsa's most accurate and dependable forecast. A heat advisory in effect tomorrow from noon until 8 p.m. Tonight, though, clear. We'll get down to the upper 70s by sunrise Monday. Then sunny and hot. A high of around 103 tomorrow with a heat index topping at 112. 80 for a low Monday night. Then Tuesday, a high of 103.