Colorado State University, Kevin E. Trenberth at the National Center for Atmospheric Research, and John E. Walsh at the University of Alaska, Fairbanks. The letter is behind the journal’s subscription wall, so I’m providing excerpts here: In mid-January, a lobe of the polar vortex sagged southward over the central and eastern United States. All-time low temperature records for the calendar date were set at O’Hare Airport in Chicago [–16°F (–27°C), 6 January], at Central Park in New York (4°F…
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