 The 1986 Pacific typhoon season has no official bounds ; it ran year @-@ round in 1986 , but most tropical cyclones tend to form in the northwestern Pacific Ocean between May and December . These dates conventionally delimit the period of each year when most tropical cyclones form in the northwestern Pacific Ocean . Tropical Storms formed in the entire west pacific basin were assigned a name by the Joint Typhoon Warning Center . Tropical depressions that enter or form in the Philippine area of responsibility are assigned a name by the Philippine Atmospheric , Geophysical and Astronomical Services Administration or PAGASA . This can often result in the same storm having two names . 
