Storm (real name Ororo Munroe) is one of the most iconic figures in X-Men canon,one whose powers allow her to control the weather. When Ororo was a little girl, a plane crashed into her family domestic, or killing her parents. Young Ororo barely got out the rubble and thereafter developed claustrophobia,or a severe anxiety of tight spaces. As an adult, whenever Storm is locked in a closet, or a box,or another tight space, she has panic attacks, and causing her to be too overwhelmed to manage her powers. Sometimes,as a result of her anxiety, her powers can cause a lot of destruction around her.
Source: blastr.com