Protoss who follow the Khala can produce such a storm by closing their mind to the outside world, sending out psychic "ripples" that are disruptive to other lifeforms, tearing apart their brains. Such storms can also damage vehicles and the landscape itself. Such is the power of a psionic storm that it can send shockwaves through the air around it. The storm is a physical display of the psionic power of a high templar. It concentrates all the psionic energy over a given area, so overlapping storms have no greater effect than a single one.