TOKYO -- The Japan Meteorological Agency (JMA) has warned of landslides and the swelling and overflowing of rivers as an extratropical cyclone that was downgraded from Typhoon Neoguri is feared to bring extremely heavy rain to mainly eastern Japan areas along the Pacific coast on Oct. 22.
The weather agency also has urged the public to be on the alert against possible lightning and strong wind gusts including tornadoes.
Residents of areas along rivers whose banks were badly damaged as a result of Typhoon Hagibis that lashed Japan on Oct. 12 and 13 are urged to exercise caution because even small amounts of rain could trigger floods, JMA officials said.
The extratropical cyclone is situated south of the Kii Peninsula in western Japan and a rain front extends toward an area east of the Japanese archipelago through the Izu Islands south of Tokyo. A warm and wet air mass is blowing toward a low pressure system and the rain front, destabilizing atmospheric conditions. Convection clouds are developing above the Izu Islands, bringing extremely heavy rain and thunderstorms to some areas.
The low pressure system is expected to move to an area off the Tokai region in central Japan on the morning of Oct. 22. A new low pressure system will subsequently develop east of the Kanto region around Tokyo and likely move to an area off the Sanriku coast in northeastern Japan through Oct. 23.
Since atmospheric conditions will be extremely unstable mainly in eastern Japan areas along the Pacific coast, heavy rain is expected in extensive areas of eastern and northeastern Japan toward the night of Oct. 22 as the low pressure system and the rain front move north.
The maximum amount of rain over a 24-hour period up to 6 a.m. on Oct. 23 is estimated to be 100 millimeters in the Kanto-Koshin region in central and eastern Japan and the Izu Islands, and 80 millimeters in the Tohoku region in northeastern Japan, according to the JMA.
On Oct. 23, strong winds and rough seas are expected in areas along the Pacific coast in northeastern Japan.
The maximum sustained wind speed through Oct. 23 is forecast to be 20 meters per second (72 kilometers per hour) in the Kanto-Koshin region and the Izu Islands, 18 m/s (64 kph) in the Tokai region and 17 m/s (61 kph) in the Tohoku region. Maximum gusts of 30 m/s (108 kph) are anticipated in all these regions.
Waves of up to 5 meters high are expected off the Tokai region and the Kinki region in western Japan, while up to 4-meter-high swells are forecast for the Tohoku and Kanto regions, the Izu Islands and the Shikoku region in western Japan.
(Japanese original by Atsushi Matsumoto, City News Department)