 Hurricane Karen was a hurricane of non @-@ tropical origin that formed in October of the 2001 Atlantic hurricane season . It developed out of the interaction between a cold front and an upper level trough on October 10 located to the south of Bermuda , and quickly strengthened as an extratropical storm . The storm passed near Bermuda on October 12 , producing hurricane @-@ force winds on the island . It then organized , becoming a subtropical cyclone on the 12th and a tropical cyclone on the 13th . Karen strengthened to reach 80 mph ( 130 km / h ) winds as a Category 1 hurricane on the Saffir @-@ Simpson Hurricane Scale , and after weakening over cooler waters , it made landfall on Nova Scotia as a tropical storm . It quickly became extratropical . 
