By Eric Leister, Severe Tropical Storm Prapiroon will bring potentially flooding rain and strong wind to southern Japan and South Korea during the beginning of the week.
Prapiroon is expected to strengthen and could reach typhoon status as it nears South Korea early in the week.
Prapiroon passed just to the south and west of Okinawa on Sunday evening, local time, bringing wind gusts to 96 km/h (60 mph).
After leaving the Ryukyu Islands, Prapiroon will set its sights on the Korean Peninsula and southern Japan.
“Prior to the arrival of Prapiroon, South Korea will endure locally heavy rainfall through Monday as a frontal boundary stalls over the region," said AccuWeather Senior Meteorologist Adam Douty.
These rounds of rain, in addition to impacts from Prapiroon, will set the stage for flooding and an elevated risk for mudslides.
While Prapiroon will not reach South Korea until Monday night, heavy rain has already begun to fall across the country.
Moisture from Prapiroon is bring pulled northward into the frontal boundary sitting across the Korean Peninsula, further enhancing the ongoing rainfall.
The worst impacts from the storm in South Korea and southern Japan will be felt on Monday night and Tuesday as the tropical cyclone tracks near the southern coast of mainland South Korea and just to the north of Kyushu.
While Prapiroon may reach typhoon strength on Monday, it is expected to begin weakening prior to reaching South Korea.
As a result, the southern coast of South Korea and western Kyushu will endure the strongest winds with six to 12 hours of tropical-storm-force winds expected from Monday night into Tuesday. This will result in power outages, tree damage and travel disruption.
Due to Prapiroon’s weakening, the risk for any widespread damaging winds elsewhere across the Korean Peninsula and southern Japan will be low.
“Conditions will improve across South Korea and southern Japan on Tuesday evening, but scattered downpours may continue to threaten flooding,” said Douty.
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