La Niña conditions are currently forming in the Pacific Ocean, however forecasters expect that if these conditions persist through the winter, this will only be a mild episode, compared to La Niña that have occurred in the past.

La Niña, Spanish for "little girl", occurs when sea surface temperatures drop to below normal along a band following the equator in the Eastern Pacific, the counterpart to the phenomenon of above-average sea surface temperatures known as El Niño. These two phenomena are part of the El Niño-Southern Oscillation (ENSO), one of the strongest drivers of climate variation in North America and around the world.
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The National Oceanic and Atmospheric Administration has announced that 2015-2016’s 15-month, record-breaking El Niño is over, with a 75 percent possibility for La Niña conditions to form in the Pacific Ocean by the end of autumn.

"There’s nothing left," explains NOAA Climate Prediction Center deputy director Mike Halpert. "Stick a fork in it, it’s done."

This past cycle saw record-breaking temperatures around the globe, making 2015 the hottest year on record, and setting up 2016 to break that record. It also contributed to a record hurricane season in the Pacific, and droughts in Africa and India. Massive coral bleaching and numerous red tide events, caused by high water temperatures, marred the year as well.
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Continuing the trend of upward-spiraling temperatures, February of 2016 broke even more records, with data from both NOAA and NASA agreeing on the trend. Last month was the hottest February on record, 1.21°C (2.18°F) above the 20th century average of 12.1°C (53.9°F); it also set a new all-time temperature record, beating the previous record-holder, December 2015, by 0.09°C (0.16°F). February also marked the sixth consecutive month where a monthly temperature record had been broken.
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