Update 2018-07-02: The tropical storm gained strength and will hit north-western Kyushu with typhoon-strength winds on Tuesday (03 July). The maximum sustained windspeed is 120 kmph (with gusts reaching 148 kmph). Most affected are the Gotō Islands, west of Nagasaki, as well as Tsushima Island.
The typhoon can cause minor damage to building structures; a storm tide of up to 1.5 meter above average is possible. Due to heavy rainfalls and rise of water level, coastal flooding is possible.
2018-06-29: Tropical storm Prapiroon has formed over the Philippine Sea and is forecast to hit the southern areas of Okinawa Prefecture on Sunday (01 July).
Heavy rainfalls are to be expected beforehand, which may cause floods, flash floods and landslides. Due to high winds, storm damage is possible in the areas directly affected by the tropical storm. (Air-)Traffic disruptions are to be expected. Travellers are advised to exercise elevated caution near mountainsides and rivers.