Rare 'Reverse' Typhoon 15 Approaches Japan

Typhoon 15, known internationally as Peiper [1, 2], is approaching the Japanese archipelago moving in an unusual east-to-west direction [1, 3].

The storm's rare trajectory poses a significant threat to the Kanto region, where residents are less accustomed to direct typhoon strikes compared to western Japan. This timing coincides with the Obon holiday period, potentially disrupting millions of domestic trips and homecoming journeys.

Meteorologists said the system is a "reverse typhoon" because it is traveling from the east toward the west [1, 3]. Current projections indicate the storm may make landfall between Fukushima and Chiba prefectures [1, 3]. This unusual path is attributed to specific atmospheric flow patterns that have pushed the system against the typical direction of Pacific storms [1, 3].

The threat to the Pacific side of the Tohoku and Kanto regions is particularly acute. Records show only three previous instances of typhoons making landfall on the Pacific side of Tohoku ^[1]. The danger of such rare events was highlighted by Typhoon 10 in 2016, which resulted in 27 deaths and missing persons ^[1].

Local authorities and event organizers are already taking precautions. Several summer festivals and music events have been canceled as a result of the forecast ^[3]. The storm's arrival threatens to bring heavy rain and strong winds to areas that typically see fewer direct hits from tropical cyclones [1, 3].

Peiper first formed at 3:00 JST on Aug. 4 ^[2]. While some reports focus on the general approach toward eastern and western Japan, the specific "reverse" movement remains a primary concern for emergency planners in the Kanto area [1, 2, 3].