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       xkcd - A Webcomic - Epsilon and Zeta (1126)
        
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       The average error in the NHC forecasted position of a hurricane
       three days in the future has shrunk to a third of what it was in
       1990--a staggering accomplishment. However, as you may have
       gathered, forecasts of future storm *strength* have proved more
       difficult to improve.
        
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