...KIRK IS A POWERFUL CATEGORY 4 HURRICANE... ...LARGE SWELLS COULD REACH THE U.S. EAST COAST BY SUNDAY... As of 11:00 PM AST Thu Oct 3 the center of Kirk was located near 21.5, -47.5 with movement NW at 10 mph. The minimum central pressure was 935 mb with maximum sustained winds of about 145 mph.