What Happens When Typhoons Meet? Most tropical cyclones in the Western Pacific and the East Philippine Sea, including typhoons that hit the Philippines, form over the Philippine Sea to the east.
But when two or more typhoons form close together, around 1,200 kilometers apart they can start spinning around each other, merge into a super typhoon, or pull each other off track. This phenomenon is called the Fujiwhara Effect, named after Japanese meteorologist Sakuhei Fujiwhara. It’s been observed during some of the most extreme typhoon events in recent history.
A dramatic example happened in 2009, when Typhoon Ondoy (international name: Ketsana) was followed by Typhoon Pepeng (Parma). Just as Pepeng was leaving, Typhoon Quedan (Melor) appeared, triggering a rare Fujiwhara interaction.
Pepeng was pulled back toward Luzon, looping several times over Northern Philippines, resulting in one of the longest and wettest typhoon disasters in Philippine history. It lasted nearly three weeks, affected millions of people, and caused millions of dollars in flood and infrastructure damage.
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Sources: PAGASA, DOST, National Weather Service (NWS), Asian Disaster Reduction Center (ADRC), GMA News, Manila Bulletin, and other news organizations.
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