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Lixion A. Avila and Stacy R. Stewart

as the primary platforms. GOES-East and Meteosat-9 provide the visible and infrared imagery that serve as input for position and intensity estimates based on the Dvorak classification technique ( Dvorak 1984 ; Velden et al. 2006 ). Subjective Dvorak intensity estimates used by NHC are performed by NHC's Tropical Analysis and Forecast Branch (TAFB) and the Satellite Analysis Branch (SAB) in Camp Springs, Maryland. The Advanced Dvorak Technique (ADT; Olander and Velden 2007 ) is an objective

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John L. Beven II and Eric S. Blake

the National Oceanic and Atmospheric Administration’s (NOAA’s) Intensity Forecasting Experiment (IFEX) field program. Poststorm analyses result in the creation of a “best track” database for each cyclone, consisting of 6-hourly representative estimates of the cyclone’s center location, maximum sustained (1-min average) surface (10 m) wind, minimum sea level pressure, and (since 2003) the maximum extent of 34-, 50-, and 64-kt winds in each of the four ordinal (northeast, southeast, southwest, and

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Eric S. Blake and Todd B. Kimberlain

basic statistics for the season’s tropical storms and hurricanes are given in Figs. 1 and 2 and Table 1 . (Tabulations of the 6-hourly best track positions and intensities can be found in the NHC tropical cyclone reports, available online at . These reports contain storm information omitted here because of space limitations, including additional surface observations and a forecast and warning critique.) Table 1. 2011 eastern North Pacific hurricane season

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