El Nino is back but it's late, weak and probably no big deal

An El Nino, which can alter weather worldwide, has formed but it's so weak and late that it shouldn't be a big deal, US forecasters said. An El Nino is a natural warming of the ocean that once it interacts with the atmosphere often warms up the globe and changes rainfall and temperature patterns, making some places wetter and some places drier.

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