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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Hot News: 2014 On Track to Become Warmest Year
Temperature difference chart, global warming
October 20th, 2014
The "odds are good" that 2014 will be the warmest year in the books, fueled by record ocean warmth.
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Nearly 600 Years of Tree Rings Show Altered Ocean Habitat
September 18th, 2014
Six centuries of tree-ring data have shown that coastal upwelling along the west coast of North America has become highly variable in the last half century.
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Whiffs of Antarctic Sulfur Hold Climate Clues
Antarctica
August 4th, 2014
Huge wildfires sparked by a powerful El Niño event 16 years ago left a distinct tinge of sulfur in Antarctica's snow.
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September Was Warmest on Record, NASA Data Shows
Temperature anomalies map, global warming, climate change
October 13th, 2014
September 2014 was the warmest September since 1880, update NASA data shows.
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El Nino Watch: 6 Months and Still Counting
Warm Episode relationships map - Winter, la nina, el nino
September 4th, 2014
El Niño, which has been anticipated to form since March, has yet to arrive but is still expected.
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Why Do We Care So Much About El Niño?
Sea surface height map
July 24th, 2014
The obsessive attention to the state of the latest El Niño comes from the major global impacts it can have.
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Explainer: El Niño and La Niña
Australia's weather, el nino, la nina
June 23rd, 2014
We wait in anticipation of droughts and floods when El Niño and La Niña are forecast but what are these climatic events?
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Where Is El Nino? And Why Do We Care?
Warm Episodes Relationships map, el nino
October 9th, 2014
El Niño still hasn't emerged, but forecasters give it a two-thirds chance of forming by the end of the year.
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Odds of El Niño Drop; Still Expected to Form
Warm Episodes Relationships map, el nino
August 7th, 2014
The chances of an El Niño forming by winter have dropped to 65 percent, still double the normal odds.
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Six Months In and Sizzling California Sets Record
US Statewide Average Temp Graph, hottest temperatures, climate change
July 16th, 2014
January-June 2014 was the warmest first half to a year ever in California, helping fuel the state's drought.
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