Storm Lake is a city in Buena Vista County, Iowa, United States. The population was 10,600 in the 2010 census, an increase from 10,076 in the 2000 census. It is the county seat of Buena Vista County. Storm Lake is home to Buena Vista University, originally Buena Vista College. Tyson Foods operates a large hog slaughterhouse, meat packing plant, and turkey processing plant in Storm Lake.