the 2009 philippine region typhoon season was the period that tropical cyclones formed in the western pacific ocean. the season ran throughout the year during 2009, with most tropical cyclones forming between may and november.the philippine atmospheric, geophysical and astronomical services administration (pagasa) assigns names to tropical cyclones (including tropical depressions) that enter or form in the philippine area of responsibility. these names, however, are not in common use outside of the philippines.