Happy Birthday: Weather Wizard
Mark Mardon was a petty career criminal whose capture was, ironically, the best thing that ever happened to him.
On his way to prison, Mardon escaped and fled to the home of his brother Clyde. Clyde was a scientist and had just created a wand that could control weather in its immediate vicinity.
The brothers fought over the device and Mark killed Clyde using the wand itself. With the device, Mardon became the Weather Wizard, a member of Flash’s Rogues Gallery. In later years Mardon died, went to Hell, came back as a soulless demon, and then was restored to full life.
He also internalized the wand’s powers, and can now control weather without any devices.