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Shanshan to threaten Japan with flooding, damaging winds through late week

By Eric Leister, AccuWeather senior meteorologist
By Courtney Spamer, AccuWeather meteorologist
August 09, 2018, 5:51:50 AM EDT

Shanshan will continue to impact Japan, with flooding, damaging winds and rough seas expected for much of the area.

Shanshan was downgraded from a typhoon to a tropical storm on Thursday evening, local time. The storm is moving along the eastern coastline of Honshu, and will continue to impact Japan through late week.

shanshan 5am 8/9

Since Tuesday, rough seas and surf were reported along the eastern coastline of Japan and also threatening shipping interests in the region. Periods of heavy rain began battering the Tokyo area on Tuesday. Over 130 flights in and out of Tokyo's two main airports had been canceled as of Wednesday evening.

Shanshan is expected to continue northeastward over the next day or so, bringing the dangerous cyclone along the shores of eastern Honshu. A brief landfall is possible, or the center of Shanshan may stay just off shores of Honshu.

Shanshan Risk 8/7

This track will bring significant impacts to the Japan mainland with the greatest risk for damaging winds and flooding rainfall across eastern and northern Honshu, including the Greater Tokyo Area.

Former Typhoon Jongdari recently brought heavy rainfall and damaging winds to some of these same areas. Another round of heavy rainfall and strong winds could result in widespread power outages and tree damage, along with an elevated risk for mudslides and transportation disruptions.

Even with Shanshan just off the coast of Japan, coastal flooding could be an issue on the eastern facing shores as well.

Japan Weather Center
Interactive Japan weather radar
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Locations farther north, including Sendai, may experience localized flooding and damaging winds as Shanshan tracks near or just off the coast of northern Honshu through Thursday.

Shanshan will depart to the northeast before the weekend, resulting in improved conditions across Japan.

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