Mermaids (H2O: Just Add Water/Mako: Island of Secrets)
Erigor (Fairy Tail); via Scythe
Diviners (Wizard 101)
Tritons (Wizard 101)
Trisana chandler (Circle of Magic) can use weather magic.
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.