the sioux falls storm are a professional indoor football team based in sioux falls, south dakota. the storm joined the original indoor football league as an expansion team in 1999 as the sioux falls cobras, and first took the field for the 2000 season. they currently participate in another iteration of the indoor football league; prior to that, the storm were in united indoor football (uif), where they won all four of the league's championship games. in the newer ifl, the storm have won seven of the eleven championships in the league as of 2019.