After a week of comfortable conditions across south central Iowa, heat and humidity returns this weekend. According to the National Weather Service, highs will reach the upper 80s and low 90s starting this afternoon and continuing into the early part of next week, with heat index values approaching the upper 90s on Saturday and Sunday. Chances for pop-up, isolated thunderstorms are in the forecast over the next several days as well. Stay tuned to 92.1 KRLS for the latest weather information.