Typhoon 17 formed near the Ogasawara Islands at 9 a.m. local time on Wednesday [1].
The emergence of the new storm coincides with atmospheric instability across Japan, posing a risk of flooding and severe weather for millions of residents.
Typhoon 17 is currently moving northward [1]. Meteorologists said that a weak Pacific high-pressure system is allowing the storm to maintain this northward trajectory rather than being steered westward [2]. While some reports suggest the storm may move northeast toward Okinawa and stay away from the mainland [3], other forecasts indicate it could approach Honshu next week [2].
Meanwhile, Typhoon 15 has weakened to a tropical depression [2]. Despite the downgrade, the remnants of the storm are creating an unstable atmosphere stretching from Tohoku to Shikoku [2]. This instability is drawing moist air from the sea, which is expected to produce heavy rain and thunderstorms through Thursday [2].
Rainfall forecasts for the current period are significant. The Tohoku, Tokai, and Kinki regions are predicted to see up to 150 mm of rain [1]. The Kanto-Koshin region is expected to receive up to 100 mm [1].
Temperature variations remain stark across the archipelago. Sapporo is forecast to reach a maximum temperature of 33 °C [1], while Tokyo is expected to peak at 27 °C [1].
“Typhoon 17 formed near the Ogasawara Islands at 9 a.m. local time on Wednesday”
The simultaneous presence of a new typhoon and the decaying remnants of a previous one creates a complex weather pattern. The weak Pacific high-pressure system is the critical variable; if it remains unstable, Typhoon 17 may deviate from traditional paths and make a direct impact on Honshu, compounding the flooding risks already present from the tropical depression.
