A storm system will bring showers and thunderstorms with locally heavy rainfall to much of southeastern China on Friday.
The heaviest rainfall will likely stay south of Shanghai, but north of Hong Kong during the day on Friday.
A cold front will push this heavy rainfall south toward Hong Kong Friday night. Widespread rainfall amounts from this system are expected to be 0.25 to 0.75 of an inch (6-19 mm). The heaviest rainfall amounts of 2-4 inches (50-100 mm) are expected in the corridor south of Shanghai and north of Hong Kong. Flooding is expected in this area.
The storm system will move northeast and become a very powerful over the Sea of Japan. Rain will become locally heavy around Taipei, Taiwan, later Friday into Saturday, and across South Korea into southwestern Japan.
The heaviest of the rain will reach Tokyo on Saturday night, with widespread rainfall amounts of 1 to 3 inches (25-75 mm) expected across the entire area. In addition to the rain, winds can gust to 40 mph (65 kph) across parts of the Korean Peninsula and Japan on Saturday as the storm system continues to strengthen.