It seems Marvel likes to play around with Storm ascending to a different form of Existence per say.
1. In the Rogue Storm Story arc she almost went Dark Phoenix and she was about to change.
2. In the pictures above Storm turns into a pure being of Energy Lightning Based.
3. In the Black Vortex Arc Storm was seen as possible becoming a Cosmic Entity of Pure raw cosmic power.
4. Storm becomes the ALL Mother
5. Storm becomes a Thor
6. Storm is a Vampire and can change her body to flesh and smoke.
7. We have another example of Storm's body actually becoming an Elemental form from a different time period.
we have all these Examples of Storm's body changes or she becoming absolutely something else, but I think Marvel is not willing or too afraid to go that route. Truth be told Marvel really does not know what to do with Storm. They are stumped.