These dates conventionally delimit the period of each year when most tropical cyclones form in the northwestern Pacific Ocean.
The scope of this article is limited to the Pacific Ocean, north of the equator and west of the International Date Line.
[1] On January 16, the remnants of a weakening cold front to the east of the Philippines spawned an area of low pressure.
The Chin's Atlas data set has the system moving to the north of Palau and eventually dissipating to the northeast of Catanduanes as a tropical storm on April 16.
[2] Historic weather maps has the low moving straight west towards Mindanao, and curving sharply to the north on the 13.