The Spawn of the Winds are a fictional race created by Chaosium in 1994 for the Call of Cthulhu RPG, which were based on Brian Lumley's Born of the Winds.
Background
The Spawn of the Winds are the offspring produced by the mating between Ithaqua and a human female. They appear human, until their true nature is revealed. Their true form is that of a huge monstrous humanoid, which they transform into by choice or when angered. It's a race with a violent temper and which is able to alter the weather, up to a 2 miles radius. Producing lightning, blizzards, tornadoes, driving rain, and thunder.