A strong El Nino may be coming. Global warming is changing its effects.

As the planet warms, past episodes of the natural weather phenomenon may no longer be a reliable guide of how the next one plays out. By RAYMOND ZHONG Forecasters say a powerful El Nino weather pattern could form later this year, with a chance of becoming one of the strongest in three decades. The winds above the Pacific are shifting, the ocean is releasing stored-up heat, and a cascade of effects on rain, droughts and wildfires could be on its way. The National Oceanic and Atmospheric...

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