National Climatic Data Center (November 13, 1991). "The Perfect Storm". National Oceanic and Atmospheric Administration. Archived from the original on November 6, 2013. Retrieved September 13, 2009.
National Climatic Data Center (November 13, 1991). "The Perfect Storm". National Oceanic and Atmospheric Administration. Archived from the original on November 6, 2013. Retrieved September 13, 2009.