Based on extensive Siberian snow cover during the fall, the researchers correctly forecasted cold weather for much of the U.S., while most other forecasters predicted warm weather for the U.S.. For a comparison between predicted and observed temperature anomalies, please see the following images: forecast temperature anomaly Jan - Feb - Mar 2013 and observed temperature anomaly Jan - Feb - Mar 2013, U.S. only. (nsf.gov)
And it suggested that the following event would begin in late 1991, not 1990 as other forecasters predicted. (newscientist.com)
It is safe to assume that the Governing Council was privy to information that other forecasters didn't have. (canadianbusiness.com)