A large storm system over Japan will slowly move northward Thursday and will be the main weather producer for Japan on Thursday and Friday. Periods of heavy precipitation will be possible in Honshu and Hokkaido. Southern Japan will see some scattered light precipitation. By Friday, the skies should clear out in southern Japan as the storm system moves farther north.
The associated cold front will extend southwestward and will continue to trigger showers and thunderstorms over southern Taiwan, Luzon and portions of southeastern China. The rest of China and the Korean peninsula can expect dry conditions as weak high pressure prevails.
In Australia, a low pressure system off Tasmania and New South Wales will remain nearly stationary Thursday and Friday, continuing to support light to moderate precipitation across the southeastern part of the continent. Its associated cold front is expected to push eastward through southern Queensland and northeastern New South Wales, triggering scattered showers and thunderstorms. This system should move offshore by Friday. Thus, mainly coastal showers are expected over southern Queensland. Moving to the west, a trough of low pressure over the Indian Ocean will hold offshore Thursday, which will support a few showers and isolated thunderstorms over the western coast of Western Australia.
Source: Weather Underground.