 Overall , the season 's activity was reflected with a cumulative accumulated cyclone energy ( ACE ) rating of 74 . 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 . Although officially , subtropical cyclones , such as Andrea or the initial portions of Gabrielle , Jerry , and Olga , are excluded from the total , the figure above includes periods when storms were in a subtropical phase . 
