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May-June 2012

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Atlantic Hurricanes 2011: All About Irene and Lee

The 2011 Atlantic hurricane season was marked by above-average tropical cyclone activity with the formation of 19 tropical storms, of which seven became hurricanes (see Figure 1 and Table 1. The number of tropical storms includes an unnamed tropical cyclone added during the post-season review. Four of the hurricanes strengthened into major hurricanes (Category 3 or higher on the Saffir-Simpson Hurricane Wind Scale). The numbers of tropical storms, hurricanes, and major hurricanes were each above the long-term average (1981–2010) of 12, six, and three, respectively.

LIXION A. AVILA is a senior hurricane specialist at the National Hurricane Center in Miami, Florida. The cyclone summaries are based on Tropical Cyclone Reports prepared by the authors and Jack Beven, Robbie Berg, Eric Blake, Michael Brennan, Daniel Brown, John Cangialosi, Todd Kimberlain, and Richard Pasch.

STACY STEWART is a senior hurricane specialist at the National Hurricane Center in Miami, Florida. The cyclone summaries are based on Tropical Cyclone Reports prepared by the authors and Jack Beven, Robbie Berg, Eric Blake, Michael Brennan, Daniel Brown, John Cangialosi, Todd Kimberlain, and Richard Pasch.

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