▁a ▁tropical ▁cy clone . ▁And ▁inside ▁the ▁eye ▁the ▁wind s ▁are ▁relatively ▁calm . ▁At ▁higher ▁alt itudes , ▁the ▁wind s ▁within ▁a ▁tropical ▁cy clone ▁head ▁away ▁from ▁the ▁center , ▁forming ▁the ▁out flow ▁which ▁produces ▁the ▁shape ▁of ▁the ▁tropical ▁cy clone . ▁ ▁Classification ▁of ▁the ▁wind s ▁ ▁The ▁United ▁States ▁uses ▁the ▁S aff ir – Sim pson ▁h urr icane ▁wind ▁scale , ▁a ▁ 1 – 5 ▁scale ▁which ▁categor ize ▁h urr ican es ▁by ▁sust ained ▁wind ▁speed . ▁The ▁h urr icane ▁scale ▁was ▁created ▁in ▁ 1 9 6 9 ▁by ▁Herbert ▁S aff ir ▁and ▁Bob ▁Sim pson . ▁The ▁National ▁H urr icane ▁Center ▁class ifies ▁h urr ican es ▁category ▁ 3 ▁or ▁above , ▁major ▁h urr ican es . ▁The ▁J oint ▁Ty ph oon ▁Warning ▁Center ▁also ▁uses ▁a ▁scale ▁similar ▁to ▁the ▁S aff ir - Sim pson ▁H urr icane ▁Sc ale . ▁However , ▁the ▁J TW C ▁class ified ▁ty ph o ons ▁with ▁wind s ▁of ▁at ▁ 1 5 0   m ph ▁or ▁higher ▁Su perty ph o ons . ▁ ▁The ▁Bureau ▁of ▁Meteor ology ▁in ▁Australia ▁uses ▁a ▁ 1 – 5 ▁scale ▁called ▁tropical ▁cy clone ▁sever ity ▁categories . ▁Un like ▁the ▁S aff ir – Sim pson ▁H urr icane ▁Sc ale , ▁it ▁categor izes ▁tropical ▁cycl ones ▁based ▁on ▁wind ▁g ust s . ▁ ▁Beau fort ▁wind