First I want to thank you all for taking the time to give your thoughts in regards to the question! Now let's discuss!!!
Well from what I understand as it relates to Coates writing, the tangible aspects associated with energy and forces would be those found in nature such as electromagnetic, thermal, pressure gradients (forces), radiation, chemical, etc. So there is and has always been a tangible aspect to what energies she could manipulate.
Hey boo. Despite it being ridiculous or not (which I don't think it's ridiculous), the question was not about what she should be but about how she has been described in using her powers in canon. If she were solely a weather manipulator we wouldn't see her doing none of the space feats she has produced, or even the application of her power that don't directly correlate to weather such as shorting the synapses in someones brain.
I'm not sure what that means, but she generates plasma all the time (lightning is a form of plasma).
Her name may be Storm but her powers have never been limited to that of just weather. She has manipulated weather several times in space which is void of weather and atmospheres. She has controlled even the electrical synapses in opponents brain and created EM blasts which doesn't correlate to weather either. I get her primary offensive is weather related; however, the basis of how her powers operate stem from her ability to perceive energy patterns around her and manipulate those energies.
Interesting points. Just to provide some clarification again, the question was not how do we thing her power should work, but how has her powers been explained to work in canon. I agree wielding the power of weather is god-like in itself; however, the way in which she controls the weather is how she perceives the world around her and claremont explained this early on as to how her weather control is accomplished:
yes. she has done it once on a global level when she grieved for wolverine when he died, she did it again when she fought a sentinel in space during the phoenix saga.