I'd say people know who Wonder Woman is but they don't know what her powers are. While people know Storm as Halle Berre and know what her powers are.
How do you define A-list?
Storm is a popular comic book character who has a presence in media outside the comics and who is recognized by people who don't read comic books. If that's A-list then she qualifies.
But is she a pop culture icon? In the early 90s, when the Xmen were at the height of their popularity, I would have said yes, along with Xavier, Magneto, Wolverine, Cyclops, and Jean. Nowadays, I don't think so as the X-men in general have fallen off the radar. The only one who has maintained pop culture icon status is Wolverine.