The Joint Typhoon Warning Center (JTWC) reported that Jangmi had 10-minute maximum sustained winds of 130 km/h (81 mph) at 09:00 UTC on May 31.
The center of the storm was located about 522 km (324 miles) south of Kadena Air Base on Okinawa. Forecasters reported a ragged eye about 111 km (69 miles) wide, with several smaller rotating vortices inside the eyewall.
Meanwhile, according to the analysis by the Japan Meteorological Agency (JMA) at 06:00 UTC, the storm was moving north at 20 km/h (12 mph) with a central pressure of 975 hPa. 10-minute maximum sustained winds were estimated at 108 km/h (67 mph), with gusts reaching 162 km/h (101 mph).
JMA forecasters expect Jangmi to reach typhoon intensity by 18:00 UTC on May 31, with maximum sustained winds increasing to 126 km/h (78 mph), gusts to 180 km/h (112 mph), and central pressure falling to 970 hPa.
JMA reported that typhoon-force winds extended up to 185 km (115 miles) from the center, while gale-force winds reached about 440 km (273 miles) from the storm.
Image credit: JTWC
Strong winds affected large areas of the Philippine Sea and East China Sea. JTWC reported significant wave heights of about 12.2 m (40 feet) near the center of the storm, creating dangerous conditions for maritime operations.
The storm is forecast to remain south of Okinawa before continuing northward through the East China Sea during the first days of June. Hazardous seas, strong winds, and periods of heavy rainfall are expected across the Ryukyu Islands, waters east of Taiwan, and parts of the northern Philippines.
The storm is forecast to bring heavy rain to parts of Taiwan as it approaches Okinawa and Amami in Japan through June 1 and 2. It is forecast to approach western and eastern Japan through June 3, producing heavy rainfall in the region.
“There is a risk of heavy rain exceeding 200 to 300 mm (7.9 to 11.8 inches) in various areas. He advised people to take safety precautions against strong winds, high waves, storm surges, landslides, overflowing rivers, and flooding in low-lying areas,” Ikeda Toru of the Japan Meteorological Agency told NHK.
More than 290 flights have been canceled from May 31 through June 2, mainly departures from and arrivals in Okinawa, NHK reported.
In the Philippines, where Jangmi is locally named Domeng, the cyclone and the enhanced southwest monsoon were producing strong to gale-force gusts across Batanes, Cagayan, and many parts of Luzon and the Visayas. The agency also warned of rough seas along the eastern coast of Batanes, where waves were forecast to reach up to 3.5 m (11.5 feet).
References:
1 Prognostic Reasoning for Typhoon 06W (Jangmi), Warning No. 017 – JTWC – May 31, 2026
2 Tropical Cyclone Information Bulletin – JMA – May 31, 2026
3 Severe tropical storm Jangmi nears southern Japan – NHK – May 31, 2026
4 Tropical Storm Jangmi’s outer ring to bring rain to Taiwan next week: CWA – Focus Taiwan – May 30, 2026
AloJapan.com