When the Washington Valor fired Dean Cokinos on May 16, 2018, after a 0–7 start to the 2018 season, McDowell was named the interim head coach.[2] Under McDowell, the Valor finished the season with a 2–3 record and the last place position for the playoffs of four AFL teams that qualified. The Valor then upset the top-seeded Albany Empire in a home-and-home series with the greater aggregate score. The Valor then defeated the Baltimore Brigade 69–55 in ArenaBowl XXXI. After the season ended, McDowell's interim tag was removed and was named the permanent head coach for the 2019 season.[3]