Definitions for "1999 Pacific typhoon season"
The 1999 Pacific typhoon season has 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. http://www.typhoon2000.ph/garyp_mgtcs/may03sum.txt These dates conventionally delimit the period of each year when most tropical cyclones form in the northwestern Pacific Ocean.