The Tornadoes were held to just two hits as the Bulldogs' Chris Eckstaine tossed a complete, albeit shortened, game with six strikeouts in the five-inning contest.
Parker Rolfes had a home run and three runs driven in to lead LeMars (16-2) as they plated three in the second, three in the fourth and five in the fifth.
Nic Seaman took the loss for the green and white as he gave up five earned runs on five hits. He walked seven and struck out five.
Aaron Krier and Trey O'Brien collected the lone Storm Lake hits.
The Tornadoes dropped to 9-10 with the loss. Storm Lake will host Western Christian Wednesday night.