Miguel Ferrer, who played Weather Wizard, also starred as The Weatherman in Justice League of America (1997).
In this episode, it's not made clear if this Flash is Barry Allen or Wally West. However, the later Justice League series, the Flash is confirmed to be Wally West. Since the Flash in this episode shares many personality traits of the Justice League Flash, more than likely they're the same man.
First team up with a character who would later join Superman as a member of the Justice League.