High Quality Content by WIKIPEDIA articles! The Oklahoma City Thunder are a professional basketball team based in Oklahoma City, Oklahoma, United States. They play in the National Basketball Association (NBA) and are a member of the NBA Western Conference`s Northwest Division. The Thunder were founded in 1967 as the Seattle SuperSonics as one of one of two franchises that joined the NBA in the 1967–68 season. The SuperSonics moved to Oklahoma City after the 2007–08 season.