However , weakening occurred again due to an eyewall replacement cycle , and at 0330 UTC on September 11 Ivan passed 23 miles ( 37 km ) south of Portland Point , Jamaica , its closest approach , with winds of 150 mph ( 240 km\/h ) .
However , the storm weakened again beause of another eyewall replacement cycle , and at 0330 UTC on September 11 Ivan passed 23 miles ( 37 km ) south of Portland Point , Jamaica , its closest approach , with winds of 150 mph ( 240 km\/h ) .