 On October 24 , cool , dry air entered the newly developed convection , and as a result it transitioned into a subtropical cyclone . Gilda became the first tropical system to pass through a subtropical stage prior to becoming extratropical . The large circulation continued northeast before becoming extratropical on October 27 . The remnants of Gilda intensified as they tracked near Atlantic Canada , attaining a central pressure of 968 mbar ( hPa ; 28 @.@ 58 inHg ) near Cape Race , Newfoundland . The system eventually dissipated near southern Greenland on October 29 . 
