Combing through historical records dating back to the late 1800s, the CSI team identified the separate “fingerprints” of wintertime climate conditions related to El Niño and the NAO (North Atlantic Oscillation). They deduced that NAO conditions alone could explain Europe’s extreme winter and the large-scale cold temperatures in the United States
The CSI Team found abundant historical evidence of heavy mid-Atlantic snowstorms whenever an El Niño and a negative NAO acted in concert, supporting their conclusion that the record-setting snowstorms were the result of natural causes.
But could global warming have elevated the potency of this dynamic duo? The CSI Team didn’t find a connection.
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