The seventh named Name_conferral storm Catastrophe of the 1996–97 South-West Indian Ocean cyclone season , Gretelle developed Coming_to_be within the intertropical convergence zone on January 19 , and gradually intensified Cause_change_of_strength while moving Motion southwestward .

the seventh tropical storm Catastrophe and sixth hurricane Catastrophe of the 1963 atlantic hurricane season , flora developed Coming_to_be from a disturbance in the intertropical convergence zone on september 26 while located southwest of the cape verde islands .