The highest ever ACE

The table on the right shows the Accumulated Cyclone Energy (ACE) for each storm in the season. ACE is, broadly speaking, a measure of the power of the hurricane multiplied by the length of time it existed, so storms that last a long time, as well as particularly strong hurricanes, have high ACEs. ACE is only calculated for full advisories on tropical systems at or exceeding 34 knots (39 mph, 63 km/h) or tropical storm strength. The highest ever ACE estimated for a single storm in the Atlantic is 73.6, for Hurricane San Ciriaco in 1899. This single storm had an ACE higher than many whole Atlantic storm seasons, like this one. Other Atlantic storms with high ACEs include Hurricane Ivan in 2004, with an ACE of 70.4, Hurricane Donna in 1960, with an ACE of 64.6, and Hurricane Isabel of the 2003 Atlantic hurricane season had an ACE of 63.28

While Subtropical Storm Andrea was a named storm of the 2007 season, NOAA does not officially include subtropical storms' ACE ratings in season totals.[48] Andrea's ACE would have been 0.895 104kt² had it been tropical. Values accrued while Gabrielle, Jerry and Olga were subtropical are not included in their totals. The strongest storm was Hurricane Dean with a total ACE of 35.56, while Hurricane Felix came in second at 18.03. Dean's ACE was almost twice as high because it lasted about twice as long as Felix. With an ACE of 0.37, Tropical Storm Jerry and Tropical Storm Erin were tied for the lowest during the season.



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