WARNING: This article contains major spoilers for Uncanny X-Men #10, by Matthew Rosenberg, Kelly Thompson, Ed Brisson, Pere Pérez , Rachelle Rosenberg and Joe Caramagna, on sale now.
By any measure, Storm is one of the X-Men's most powerful members. Where some of her teammates only have wings or sharp, occasionally hot claws, Ororo Munroe has comprehensive control over weather and all other types of atmospheric phenomena. While some heroes might have powers that rely on vaguely-defined forms of energy, it's easy to understand Storm's elemental powers on a visceral level.
Despite Storm's truly awesome abilities, it's never been clear whether she's actually an Omega-Level mutant, one of the most potentially strong mutants in the Marvel Universe. While that term and classification has been used inconsistently over the years, Storm has been called an Omega-Level mutant, a potential Omega-Level mutant and a slightly weaker Alpha-Level mutant in various stories and interviews.
In Uncanny X-Men, Marvel recently confirmed that X-Man, an alternate reality version of Cable named Nate Grey, was Marvel's most powerful Omega-Level mutant. After he started trying to reshape the world with his unparalleled telepathic, telekinetic and reality-warping abilities, he possessed Legion, Professor X's ultra-powerful Omega-Level son, to make himself one of the strongest villains in the history of the Marvel Universe.
And in Uncanny X-Men #10, Storm severely injures the Nate-possessed Legion with a giant lightning bolt.
While X-Man can stand up to dozens of heroes at once, Storm dazes him with a single massive attack that gives the X-Men's telepaths the chance to separate him from Legion.
Although her attack might seem a little bit excessive at first glance, Storm had a good reason to attack X-Man so viciously. In Uncanny X-Men #9, Nate telepathically took control of Storm's mind and transformed her into one of his Horsemen of Salvation. As an unwilling convert to Nate's worldview, Ororo was also forced to attack her friends until the telepathic Psylocke freed her from X-Man's influence.
While X-Man still ultimately defeated the X-Men by vaporizing them or teleporting them to parts unknown, that doesn't cheapen what Storm did. Powerhouse mutants like Magneto, Apocalypse and the Omega-Level mutant Iceman barely laid a finger on Nate during their massive brawl.
As Storm says when she attacks X-Man, she's been a goddess longer than the relatively young X-Man has been alive. When she was created by Len Wein and Dave Cockrum in 1975's Giant-Size X-Men #1, Storm was being worshiped as a weather goddess. More recently, she was transformed into an actual weather goddess by the belief of the Wakanda people and defeated the Adversary, another deity who's given the X-Men trouble for years, in Ta-Nehisi Coates and Leonard Kirk's Black Panther #172.
With Storm can precisely use her powers to created miniature rain clouds and direct lightning towards specific targets on a crowded battlefield, Ororo's powers are the most impressive when she uses them on a grand scale. In Chris Claremont and Dave Cockrum's Uncanny X-Men #147, she created and dispersed a super-storm that covered most of the United States in a few minutes. While she doesn't use her abilities to this extent often, Storm's super-storms have been described as primal events that are stronger than any kind of weather seen by human civilization.
Outside of Earth's atmosphere, Storm was able to summon a bolt of lightning that was strong enough to knock out the Silver Surfer, a Thanos-level cosmic heavy-hitter, in Dwayne McDuffie and Paul Pelletier's in Fantastic Four #545. She's even used the hammer Stormcaster to become an Asgardian Goddess of Thunder a few times.
Even without any Asgardian enhancements, it's difficult to imagine any kind of natural phenomena that Storm can't control or manipulate in some way.
As long as a few molecules of moisture and the other basic building blocks of weather are present, Storm can potentially manipulate them. While that doesn't make her as powerful as a reality-warper like X-Man, this issue proves that she's not totally outclassed by someone like that either. Even if Storm isn't officially an Omega-Level mutant, she sure acts like one, and her potentially unlimited powers command respect from every corner of the Marvel Universe.