Warnings of an El Niño unlike any other are starting to become reality.

For months, scientists have cautioned that the natural climate pattern could grow into a record-breaking beast, releasing extraordinary amounts of heat from the ocean and fueling droughts, floods, heat waves and severe storms. Now, a traditional strength measurement of El Niño, called the Oceanic Niño Index, indicates that the pattern has reached an intensity unseen in recorded history.

On September 21, the daily sea surface temperature in the region where El Niño develops — the central and eastern equatorial Pacific Ocean — reached 3.08 degrees Celsius warmer than the…

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