Tropical Storm Man-yi Bearing Down on Japan

By , Senior Meteorologist
September 15, 2013; 6:17 PM ET
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Tropical Storm Man-yi is close to typhoon status and is bearing down on Japan.

Man-yi is going to remain a tropical storm and is already pushing onshore. Landfall of the center of the storm is expected to be mid-day local time, about halfway between Tokyo and Osaka. Man-yi will then spend the first half of Monday crossing southeastern Honshu Island, passing just to the northwest of Tokyo.

Man-yi will be weakening and transitioning to a non-tropical system as it crosses the country and moves off the eastern coastline.

Heavy rain will continue to accompany Man-yi across Japan. Tokyo has already received 3 inches of rain, as of Sunday evening, according to Meteorologist Eric Wanenchak. Just south of Osaka, nearly 10 inches of rain has with more rain expected in Shionomisaki.

A total of 150 to 300 mm (6 to 12 inches) of rain will inundate Tokyo, as well as south-central and eastern parts of Honshu and eastern Shikoku, threatening to trigger flash flooding. Localized amounts in excess of 400 mm (over a foot) are possible in the mountains and coastal portions of southern Japan, severely heightening concerns of landslides.

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Damaging winds will also occur along Man-yi's path. Current indications put southern Honshu, including Tokyo, at greatest risk of enduring wind gusts of 80 to 130 kph (50 to 80 mph). Such winds are capable of causing widespread tree damage, power outages and some structural damage.

The immediate southeastern coastline will be most susceptible to gusts on the higher end of that range.

Coastal flooding is a concern along the southern and eastern coast of Honshu. The threat of a damaging 0.5- to 1.5-m (2- to 4-foot) storm surge is highest along its southeastern coast--east of where Man-yi moves inland or comes closest to making landfall.

Tokyo is not exempt from facing coastal flooding problems.


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