The cyclone summaries are based on Tropical Cyclone Reports prepared by the authors and Lixion Avila, Robbie Berg, Jack Beven, Michael Brennan, Daniel Brown, John Cangialosi, Chris Landsea, Richard Pasch, and Stacy Stewart. These reports are available online at www.nhc.noaa.gov/2011epac.shtml. Gerry Bell of the NOAA/Climate Prediction Center produced Fig. 3 and Michael Ventrice of the University at Albany, State University of New York, Albany, New York, produced Fig. 4.
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Cangialosi, J. P., and J. F. Franklin, 2012: 2011 National Hurricane Center Forecast verification report. NOAA/NHC, 76 pp. [Available online at http://www.nhc.noaa.gov/verification/pdfs/Verification_2011.pdf.]
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Velden, C., and Coauthors, 2006: The Dvorak tropical cyclone intensity estimation technique: A satellite-based method that has endured for over 30 years. Bull. Amer. Meteor. Soc., 87, 1195–1210.
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The term post-tropical was adopted in 2010 and refers to a cyclone that no longer possesses sufficient tropical characteristics to be considered a tropical cyclone.
The AMSR-E instrument on Aqua failed on 4 October 2011.
Unless otherwise indicated, vertical shear estimates refer to the 850–200-mb levels and are extracted from the model analyses from the Global Forecast System.