In June, the U.S. National Oceanic and Atmospheric Administration (NOAA) declared that an El Nino is now under way. Meteorologists expect that this El Nino, coupled with excess warming from climate change, will see the world grapple with record-high temperatures. Here is how El Nino will unfold and some of the weather we might expect:WHAT CAUSES AN EL NINO? El Nino could offer a reprieve to the Horn of Africa, which recently suffered five consecutive failed rainy seasons. Historically, both El Nino and La Nina have occurred about every two to seven years on average, with El Nino lasting 9 to 12 months.

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Persons: Kim Hong, heatwaves, El, El Nino, Michelle L'Heureux, Tom DiLiberto, DiLiberto, La Nina, Nina, Gloria Dickie, Jake Spring, Angus MacSwan, Sandra Maler Organizations: REUTERS, Nino, Reuters, El Nino, U.S . National Oceanic, Atmospheric Administration, NOAA, El, Graphics, el nino, NINO, U.S . West, La, Sao Paulo, Thomson Locations: Cheongju, South Korea, China, United States, Beijing, Rome, Americas, Asia, El, Pacific, Peru, Philippines, Canada, Central, South America, Australia, of Africa, Eastern Pacific, El Nino, London, Sao