With the win, Sioux Falls swept the best-of-five series and earned a trip to the Western Conference Finals to face the Dubuque Fighting Saints, who swept Fargo.
Omaha opened the scoring at 11:49 of the first period. Ben Marshall tracked down his own dump-in below the goal line before feeding a centering pass into the slot that was put in by Seth Ambroz for his second goal of the playoffs.
After that, the stampede was on. Sioux Falls tied it just 1:05 later when Clark Cristofoli launched a seeing-eye left point slap shot that found its way through traffic and past Omaha goaltender Todd Mathews.
Sioux Falls broke the game open in the second period with a four-goal outburst in span of just over eight minutes. Daniel Doremus scored at :36 and Rau added goals at 5:49 and 7:38. Sam Coatta grabbed a loose puck at center ice and broke in shorthanded, scoring his first goal of the playoffs at 8:39.