From Epochs of Askellon:
Almost unnoticed amongst these early days of unification and rebellion were the first recordings of terrible Warp storms raging across the once-peaceful region. Twisted legends began that the storms were growing in appetite, and only abated after they had devoured sufficient ships or worlds to sate themselves temporarily. It was not until millennia later that Argo Kappellax, then Arch-Magos of Cerix Magnus, established they were not legion but instead a singular storm, rising and falling, though no aerythmatical formulae could fully predict its actions. The name the Navigator Houses of Askellon cursed it with ages ago, Pandaemonium, soon became commonplace amongst those who ply the Warp routes across the sector and beyond.
From Eye of the Storm:
Almost lost within her multi-layered flux charts showing the Infernal Storm’s rage was one area of calm. So small was this area that it went unnoticed for many more generations, until one of the later factions devoted to worshipfully studying her grand work made the discovery. It seemed as if each time the raw Warp-stuff of the storm has crept and coiled along the space lanes of the sector, in every single instance it has recoiled "as if in terror" from the Enkidu system. The group struggled to arrive at formulae to explain the phenomenon, and kept their finding hidden lest others learn of it and possibly use it to degrade the memory of the great Magos.