▁which ▁was ▁well ▁above ▁the ▁ 1 9 8 1 – 2 0 1 0   med ian ▁of ▁ 9 2 , ▁as ▁well ▁as ▁the ▁highest ▁value ▁since ▁ 2 0 1 0 . ▁Broad ly ▁speaking , ▁A CE ▁is ▁a ▁measure ▁of ▁the ▁power ▁of ▁a ▁tropical ▁or ▁subt rop ical ▁storm ▁multip lied ▁by ▁the ▁length ▁of ▁time ▁it ▁existed . ▁Therefore , ▁a ▁storm ▁with ▁a ▁longer ▁duration ▁or ▁stronger ▁intensity , ▁such ▁as ▁Matthew , ▁will ▁have ▁high ▁values ▁of ▁A CE . ▁It ▁is ▁only ▁calculated ▁for ▁full ▁advis ories ▁on ▁specific ▁tropical ▁systems ▁reaching ▁or ▁exceed ing ▁wind ▁spe eds ▁of ▁ 3 9   m ph ▁( 6 3   km / h ). ▁According ly , ▁tropical ▁de press ions ▁are ▁not ▁included ▁here . ▁After ▁the ▁storm ▁has ▁diss ip ated , ▁typically ▁after ▁the ▁end ▁of ▁the ▁season , ▁the ▁N HC ▁re ex am ines ▁the ▁data , ▁and ▁produces ▁a ▁final ▁report ▁on ▁each ▁storm . ▁These ▁revis ions ▁can ▁lead ▁to ▁a ▁re vised ▁A CE ▁total ▁either ▁up ward ▁or ▁down ward ▁compared ▁to ▁the ▁oper ational ▁value . ▁ ▁Systems ▁ ▁H urr icane ▁Alex ▁ ▁A ▁weak ▁area ▁of ▁low ▁pressure ▁developed ▁over ▁north western ▁Cuba ▁in ▁association ▁with ▁a ▁station ary ▁front ▁on ▁January   6 . ▁The ▁front al ▁wave ▁intens ified ▁as ▁it ▁moved ▁into ▁the ▁central ▁Atlantic , ▁tempor arily ▁att aining ▁h urr icane - force ▁wind s ▁by