 Dick Lofton, 1023 KRMG, Tulsa's News and Talk. The July heat is back and heat index values rising as well. Temps continue to slowly climb. In fact, most of us hit 100 or higher by Sunday and we'll keep things at century mark levels for Monday and Tuesday early next week. Heat index also part of the problem with our ever-present humidity. The heat index by Sunday and especially Monday and Tuesday up in that 105 to 110 range. Some relief in sight, shower chances and a cool down middle of next week.