Nearing the United States East Coast , the hurricane Catastrophe quickly attained Getting Category 4 intensity Cause_change_of_position_on_a_scale on September 26 , before it subsequently reached Arriving its peak intensity Cause_change_of_position_on_a_scale with maximum sustained winds of 150 mph ( 240 km/h ) and a minimum barometric pressure of 930 mbar ( hPa ; 27.46 inHg ) .