Typhoon Nepartak weakened to an extratropical cyclone Wednesday over the Sea of Japan off the coast of northeastern Japan after it traversed through Iwate and Akita prefectures, the weather agency said.It made landfall on the northeastern Japan prefecture of Miyagi in the morning, veering off its initially projected course that would have taken it toward the Tokyo area where the Olympics are taking place.The atmosphere in northeastern and eastern Japan became very unstable due to cold air and the influence of warm and wet air flowing toward the extratropical low, according to the Japan Mete…READ FULL ARTICLE