The fifteenth named storm of the annual Pacific typhoon season, Talas formed as a tropical depression several hundred miles northwest of the Mariana Islands on September 20.

Although Talas remained weak and never made landfall, the rainbands to its north brought heavy precipitation to eastern Japan, which triggered flooding and landslides.

Late on September 20, the Japan Meteorological Agency (JMA) first noted that a tropical depression formed at 21°N 141°E / 21°N 141°E / 21; 141, about 930 km (580 mi) northwest of Guam.

[1] On the next day, the Joint Typhoon Warning Center (JTWC) also noted the possibility of tropical cyclogenesis, as the system tracked northward while located in a warm sea surface temperatures of 29–30 °C (84–86 °F) and low wind shear.

[7] Talas transit to an extratropical cyclone early on September 24,[8] and the system passed about 140 km (87 mi) south of Tokyo later that day.

[9] Despite Talas remaining offshore, the rainbands to its north brought heavy rains to eastern Japan.

The Japan Meteorological Agency (JMA) issued a heavy rain warning for Shizuoka Prefecture and the Kantō region on September 23.

[10] The Fire and Disaster Management Agency issued evacuation orders to various cities and villages in Ibaraki, Tochigi, Chiba, Kanogawa, Shizuoka, Aichi, and Mie Prefecture,[11] including 3,000 people in Yokohama.

The Okitsu River [ja] was flooded by a large amount of sediment and driftwood, which made it difficult for water extraction.

[20] On September 26, the governor of Shizuoka Prefecture, Heita Kawakatsu, requested the Self-Defense Forces to be dispatched to clean up the damage caused by Talas.