For the first time this century, the weather phenomenon known as La Niña has returned for the third year in a row. La Niña is likely to bring about more extreme weather across the whole globe.
The weather system is characterized by unusually cold ocean temperatures in the Equatorial Pacific due to winds blowing the warm water on the surface of the Pacific towards Indonesia. This is the opposite of El Niño, which brings unusually warm ocean temperatures to the Equatorial Pacific.
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Usually, El Niño and La Niña events occur every two to seven years, typically lasting nine to 12 months, with El Niño occurring more often. Climate change is a large contributor to rising global temperatures and more extreme weather events, including La Niña.
World Meteorological Organization Secretary-General Petteri Taalas said in a statement, "It is exceptional to have three consecutive years with a La Niña event."
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