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| Keywords: Hist east pac ACE trend 1971-2012.gif en Historical East Pacific Seasonal Activity from 1971 through 2012 with the 2013 outlook Reliable tropical storm and hurricane data for the eastern Pacific began in 1971 The phrase 'total seasonal activity' refers to the collective intensity and duration of eastern Pacific named storms and hurricanes occurring during a given season The measure of total seasonal activity used by NOAA is called the Accumulated Cyclone Energy ACE index The ACE index is a wind energy index defined as the sum of the squares of the maximum sustained surface wind speed knots measured every six hours for all eastern Pacific named systems while they are at least tropical storm strength --http //www cpc ncep noaa gov/products/Epac_hurr/background_information html NOAA 2013 http //www cpc ncep noaa gov/products/Epac_hurr/figure3 gif US-NOAA PD-USGov Uploaded with UploadWizard Ecological trends Tropical cyclones in the North Pacific | ||||
