Tropical Storm Prapiroon (Formerly Bagyong Nina) is now accelerating to the northeast passing south of the Japanese Islands. The system was last located approximately 820km southwest of Tokyo or about 480km south of the island of Shikoku. Maximum sustained winds are at 95kph with gusts of up to 120kph. TS Prapiroon is moving east northeastward at 35kph.
IR Image from NRLMRY
Latest satellite image shows a central convection still persists although it is definitely looking weak. Prapiroon is also beginning to suffer from cooler waters, higher wind shear, and dry air.
Radar from JMA
While Prapiroon is too far south to directly impact Japan (except for high waves along the coast!), it is interacting with a frontal system moving eastward resulting to widespread light rains across Shikoku and Honshu. Rains will continue throughout tonight as they move eastward. Rainfall amounts will generally be light although some stations may get 50 to even 80mm of rain in the next 12 hours. For the latest radar images, warnings, and forecasts from Japan, please click HERE (JMA Website)
Forecast Track (NOT OFFICIAL!)
Tropical Storm Prapiroon is forecast to continue moving quickly to the northeast. It could start transitioning to an extra-tropical cyclone in the next 24 hours as it gets fully embedded into the baroclinic zone. Prapiroon is forecast to complete that transition cycle in the next 2 to 3 days as it moves into the Northern Pacific.
We'll have another update on Prapiroon tomorrow.
Issued (0930 UTC) 530pm PhT 101812