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El Niño will quickly develop into a strong event between July and September, fuelling the likelihood of extreme weather, the United Nations weather and climate agency warned on Friday.
The World Meteorological Organisation said El Niño had already set in, and would quickly gain strength, as it warned countries to brace for impact.
El Niño is a natural climate phenomenon that warms surface temperatures in the central and eastern equatorial Pacific Ocean, bringing worldwide changes in winds, pressure and rainfall patterns.
It typically takes place every two to seven years and lasts around nine to 12 months.
