El Nino and La Nina

El Niño and La Niña are parts of an oscillation in the ocean-atmosphere system (called the El Niño Southern Oscillation, or ENSO cycle) that can impact weather and climate conditions across the globe. El Niño features warmer-than-average temperatures in the waters of the equatorial Pacific Ocean, while La Niña features colder-than-average waters. Read our stories below on the latest ENSO conditions and research into how the cycle affects global weather patterns.
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El Niño Expected to Strengthen, Bring Wild Weather Across US
A comparison of sea surface temperatures in the equatorial Pacific in 1997 (a strong El Nino year) and 2015.
November 16th, 2015
This year's particularly strong El Niño is expected to get even stronger before it's done.
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Upcoming El Niño May Be As Wild As 1997 Event
Map of waters in the equatorial Pacific Ocean, revealing an El Nino is on its way.
October 14th, 2015
El Niño is expected to be more beast than "little boy" this year — a forecast about the weather pattern that becomes clear in newly released maps of the waters around the equatorial Pacific Ocean.
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DIY Halloween Costumes: 7 Geeky Getups for Any Party
Doc Brown costume.
October 27th, 2015
There's still time to assemble an appropriately geeky getup in time for this weekend's festivities.
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Snakebites in Costa Rica Rise Along with El Niño Cycles
a female Terciopelo snake in Costa Rica
September 11th, 2015
Snakebites in Costa Rica spike during El Niño and La Niña as venomous snakes respond to changes in the weather and climate.
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Record Hot First Half May Herald Warmest Year Yet
Global surface temperature differences map
July 20th, 2015
June 2015 was the warmest June on record, and there's a good chance 2015 will be the warmest year.
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El Niño Brings Wet Summer to Plains; Western Drought Continues
May 21st, 2015
The West can expect its warm and dry weather to continue through the summer, while the central Plains will be relatively cool and wet.
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Wet (But Warm) Winter: Strong El Niño to Usher in Lots of Rain
Map of waters in the equatorial Pacific Ocean, revealing an El Nino is on its way.
October 15th, 2015
A strong El Niño is brewing in the Pacific, which should bring warmer and wetter weather across the Southern and Eastern United States.
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Predicting El Niño Devastation, Weeks in Advance
Trinity Lake
May 30th, 2015
No, El Niño is not the source of every weather crisis, but it can be devastating, and researchers have uncovered a new clue that may help predict how bad things can get.
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