Discord (My Little Pony series) can use Chaos Magic to create storm clouds as well as summon clouds made out of cotton candy which rains chocolate milk.
Stormy (Winx Club) is a witch who's been described as the "Queen of Storms" Stormy creates and controls storms, thus deriving a pun from her name. She can create strong gusts of wind. She draws her powers from storms and the wind.
Icy (Winx Club) can cause magical blizzards and snowstorms
Diviners (Wizard 101) are wizards and witches from the School of Storm, their specialties versed around storm magic.
Storm fairies (Disney Fairies), are able to control the weather and conjure lightning.