I think a compelling argument could be made that Storm actually is a 'reality warper', who just subconsciously limits herself to 'weather effects'. What else is 'the weather' other than 'the local state of reality', after all. When you get down to it, by controlling things down to the subatomic scale, up to the dimensional scale, she really could do anything if she wants to. Ultimately it's fruitless to speculate too much, since she's branded as 'Storm', so those rare feats aside, lightning and wind are the main tools she employs on the page, but if you really think about it, there should be no limit to her powers [particularly if she accesses her magical/divine heritage].