The 1999 Pacific typhoon season was the last Pacific typhoon season to use English names as storm names. It was a very inactive season, featuring the lowest number of typhoons on record, five. It had no official bounds; it ran year-round in 1999, but most tropical cyclones tend to form in the northwestern Pacific Ocean between May and November. These dates conventionally delimit the period of each year when most tropical cyclones form in the northwestern Pacific Ocean.