The table on the right shows the 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 35 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. Other Atlantic storms with high ACEs include Hurricane Ivan in 2004, with an ACE of 70.4, and Hurricane Donna in 1960, with an ACE of 64.6.
The cumulative ACE for the 2006 season was toward the lower end of the official "Near Normal" grading. The number of tropical storms and hurricanes was near the long-term average. Hurricane Helene had the highest rating of the season with a total ACE of 24.3, and Hurricane Gordon came in second highest, having a total ACE of 22.2. The unnamed tropical storm had the lowest, totaling to 0.654. The season total ACE was 78.535.
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