Uncanny X-Men 170 (June 1983) & 201 (January 1986)
In 170, Storm challenges Callisto for leadership of the Morlocks and wins.
in 201, Storm challenges Cyclops for leadership of the X-Men and wins.
Should Storm ever challenge you for a leadership position, let her have it.
@BenjaminSpider
Storm is my favorite of the X-Men, closely followed by Gambit and Rogue