 The season officially began on June 1 , 1973 , and lasted until November 30 , 1973 . These dates conventionally <unk> the period of each year when most tropical cyclones form in the Atlantic basin . However , the first system formed on April 18 , more than a month before the official start . Three more depressions formed before June 1 ; however , none attained storm intensity . The first named storm of the year was Hurricane Alice which formed on July 1 and became the first known cyclone to affect Bermuda during July . More than a month later , the second hurricane , Brenda , formed and was considered the worst storm to strike Mexico along the eastern coast of the Bay of Campeche , killing 10 people . 
