When it reached Mexico , Hurricane Dean was a Category 5 storm , but it missed large cities and its exceptional Category 5 strength landfall caused no deaths and less damage than in the Caribbean islands it passed as a Category 2 storm . Upon reaching Mexico , Hurricane Dean was a Category 5 storm , but it missed major population centers and its exceptional Category 5 strength landfall caused no deaths and less damage than in the Caribbean islands it passed as a Category 2 storm .