Overview
- The Japan Meteorological Agency said on May 31 that Jangmi had intensified south of Okinawa and was forecast to reach or maintain typhoon strength as it moves north toward the Ryukyu chain and Japan’s Pacific coast.
- Forecasters project the storm will approach Okinawa and the Amami Islands on June 1–2 before shifting east to western and eastern Japan around June 3, with a slight weakening expected as it moves northeast.
- The JMA warned of warning‑level rainfall with multi‑day totals of about 200–300 millimetres in parts of Okinawa, Amami, southern Kyushu, Shikoku and Kansai and up to 200 mm in Tokai and Kanto, raising risks of river flooding and landslides.
- Authorities and carriers have acted ahead of the storm, with nearly 300 flight cancellations mainly affecting Okinawa and public advisories issued for strong winds, storm surge and coastal hazards.
- Jangmi is also driving hazardous seas and strong gusts across the Ryukyus, waters east of Taiwan and northern Philippines, with agencies noting very large waves near the center and a stalled frontal system that could prolong heavy rain over vulnerable areas.