1964 Pacific Typhoon Season

The 1964 Pacific typhoon season has no official bounds; it ran year-round in 1964, but most tropical cyclones tend to form in the northwestern Pacific Ocean between June and December. 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. Storms that form east of the date line and north of the equator are called hurricanes; see 1964 Pacific hurricane season. Tropical Storms formed in the entire west pacific basin were assigned a name by the Joint Typhoon Warning Center. Tropical depressions in this basin have the "W" suffix added to their number. 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.

The 1964 Pacific typhoon season was the most active season in recorded history with 39 storms. Notable storms include Typhoon Louise, which killed 400 people in the Philippines, Typhoons Sally and Opal, which had some of the highest winds of any cyclone ever recorded at 195 mph, Typhoons Flossie and Betty, which both struck the city of Shanghai, China, and Typhoon Ruby, which hit Hong Kong as a powerful 140 mph Category 4 storm, killing over 700 and becoming Hong Kong's worst named typhoon in history.