 Nida accelerated northeast and its maximum sustained winds weakened to 90 mph ( 148 km / h ) . Interacting with an upper level low pressure system over Japan , the typhoon became elongated . Nida weakened below typhoon strength as the center passed 290 miles ( 467 km ) south of Tokyo , Japan . By May 21 , Nida transitioned to an extratropical cyclone . The JMA continued to track the remnants of Nida as it weakened northeast of northern Japan . 
