Seasons of Chaos
The outer planes consist of the elemental planes of fire, water, earth and air as well as the abyss, astral plane and limbo. Without proper governing from the divine the lines between these planes has blurred, so much that sometimes these planes leak into each other. In extreme cases the effects of the planes colliding can cause vortexes of energy to flood from one plane into another, or in less severe cases magical storms or strange effects.
Some of these vortexes are permanent and form the centres of thriving communities. For instance great forges can be created around fiery vortexes allowing a constant and immense source of heat to temper and forge metals and pools of never ending water can be used to irrigate great crop lands. Unfortunately not all vortexes are quite so stable and can wildly lash about destroying the areas around them.