Typhoon Halong (2025)

Typhoon Halong (transliterated from Vietnamese Hạ Long) was a powerful tropical cyclone that affected the Volcano, Ogasawara, and Izu islands before moving north and significantly affecting the western region of Alaska as an extratropical cyclone in early October 2025. The twenty-second named storm and the ninth typhoon of the 2025 Pacific typhoon season, Halong formed from a broad area of convection south of Iwo Jima on October 4. Located in a favorable environment, the storm strengthened to a severe tropical storm on October 5 and a typhoon on October 6 as an eye began to develop. That same day, Halong rapidly intensified into a very strong typhoon (Category 4 on the Saffir–Simpson scale), developing a defined, clear eye. It passed near Japan near peak intensity before turning northeast, gradually weakening due to increasing wind shear and transitioned into an extratropical cyclone on October 10. The remnants of the storm later went on to affect the Aleutian Islands, before eventually weakening and dissipating by October 13.

Halong generated strong waves that left one person dead in Japan. In Hachijojima, wind speeds were measured at 107 knots (123 mph) and record rainfall amounts of 349 millimetres (13.7 in) were observed. Over 2,700 customers lost water on the island and another 2,200 customers lost power. Several roads were left impassible on these islands due to flooding and downed trees. In Western Alaska, flood and high wind watches were issued as the extratropical remnants of Halong approached, bringing hurricane-force winds to the Bering Sea. The storm caused widespread damage in the Yukon-Kuskokwim Delta, where winds reached 107 miles per hour (172 km/h) in the Kusilvak Mountains. Record flooding hit Kipnuk and Kwigillingok, where homes were swept away and several residents went missing. One fatality was confirmed in Kwigillingok, with two others missing.