The NASCAR Cup Series returns to Iowa Speedway this weekend for the Iowa Corn 350 Powered by Ethanol, with three national series sharing the track across a packed three-day schedule. ET: NASCAR Cup Series Practice TV: truTV Radio: MRN, SiriusXM NASCAR Radio3:10 p.m. ET: NASCAR Cup Series Qualifying TV: truTV Radio: MRN, SiriusXM NASCAR Radio5:00 p.m. ET: NASCAR O’Reilly Auto Parts Series Hy-Vee Perks 250 TV: The CW Radio: MRN, SiriusXM NASCAR RadioSunday, Aug. 9 Schedule3:30 p.m. ET: NASCAR Cup Series Iowa Corn 350 Powered by Ethanol TV: USA Network Streaming: HBO Max Radio: MRN, SiriusXM NASCAR RadioIowa Speedway Weekend Weather ForecastThe weekend forecast currently looks favorable for racing, although Friday could bring some weather concerns.