Fujiwhara Effect to affect Typhoon Chedeng?

GMA's News TV at past 3PM on Thursday mentioned in a report a possible “Fujiwhara effect” on Typhoon Chedeng, which has drawn criticisms from netizens who are following updates on the cyclone over at PAGASA's Facebook page. But what is a Fujiwhara Effect?

According to Wikipedia, the “Fujiwhara effect” (also known as ‘Fujiwara interaction’) is a type of interaction between two nearby cyclonic vortices, causing them to appear to ‘orbit’ each other.”

It further explained: “When the cyclones approach each other, their centers will begin orbiting cyclonically about a point between the two systems. The two vortices will be attracted to each other, and eventually spiral into the center point and merge. When the two vortices are of unequal size, the larger vortex will tend to dominate the interaction, and the smaller vortex will orbit around it.”

While some netizens blamed “poor research” on the part of GMA news for the alleged false report about the “Fujiwhara effect,” we found out that it was the National Disaster Risk Reduction and Management Council (NDRRMC) who mentioned its possible occurence, based on the embedded video below.

According to the report, NDRRMC said that a “Fujiwhara effect” could possibly affect Typhoon Chedeng, citing its change in direction and the southwest monsoon (Habagat) in Mindanao as the causes.

The PAGASA, on the other hand, has always noted in its weather bulletins that Typhoon “Chedeng” is “expected to enhance the southwest monsoon and will bring rains over Visayas and Mindanao.”


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