The Elemental Storm rotation should really be looked into. Over the past couple weeks nearly every storm takes place in The Azure Span. Often several ones in a row.
A real simple, easy way to fix this issue and save the troubles many people have with getting their [Storm Chaser] achievement, would be to rotate each type of Elemental Storm in one zone at a time, before moving on to the next zone.
This way we could predict which storm will happen where.