Q) Can the storms overlap?
A) Yes they can! The storms may occasionally pass through the same locations at the same time, and when that happens the effects will stack. It’s theoretically possible (but would be extremely rare) for all eight storms to stack up in one incredible temporary superstorm.
Presently, WH effects are exclusive. Metaliminal storms are implemented as WH effects, but they are not exclusive:
https://forums.eveonline.com/t/coming-soon-metaliminal-storms-in-nullsec/258511/2
We need to make them non-exclusive as well.