It was all happening in big Rossby loops that had taken over the entire ... seven stalled peaks and lows over the same regions – ‘wave-7’ – has lasted seven times for more than two weeks.

The end of the rainy (Baiu) season in the Kanto region and northern Japan is induced by a "convection jump," known as the abrupt enhancement of convective activity (precipitation) over the northeast ...

The Meteorology, Climatology, and Geophysics Agency (BMKG) noted that this heightened rainfall potential stems from various factors.