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 eastern half of North America is definitely not dreaming of a white Christmas this season: the forecast is calling for record-breaking warm temperatures this week, with some regions to see temperatures 35º Fahrenheit (19ºC) above normal. Temperatures are expected to briefly dip over Christmas itself, but are expected to rise again for the remainder of the year.
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As predicted on Unknowncountry.com’s Climate Watch last fall, this is proving to be a winter of extraordinary fury both in the United States and Europe. England is experiencing the worst flooding in 250 years, and winter records are being broken all across the United States. Meanwhile the Austral summer is entering the record books because of its extreme heat. But why? The reason lies in an unprecedented and unexpected change in atmospheric circulation that has caused dramatic strengthening of the Pacific Trade Winds at a time when they would normally be at a seasonal low.
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