Wow, I knew this thread would sink in
Let us examine one tiny little fact that has just come into view. From the interview that was posted on the very first post, it is said that we've "barely seen" what Ororo can do. Let's tie this into the "possible omega" status she received in BP 22. Why is Ororo a "possible Omega"? Simply, because she has yet to use her abilities to the fullest potential, she has yet to unleash her entire might upon the planet. Why doesn't she? Well, Uncanny 147 shows us why. If Ororo used her powers to the fullest there is no end what she could do. She has been using a mere fraction of them and look at all the wondrous things she has done, from the "solar wind riding" to the "starcore explosion", to many many more.
In Uncanny 227, the Adversary says that Ororo's winds can shatter worlds and her lightning can turn it to dust.
In essence, Ororo isn't labeled as an Omega yet because she has yet to unleash her full might. Do notice that until mutants used their powers to their fullest expressions they were not catalogued as Omegas.
Like we've said before, Jean will try to enter Ororo's mind, and we all know what happens when people enter Storm's mind uninvited.