Intense thunderstorms with heavy rain and lightning hit the Kanto region on Saturday, triggering a tornado watch for Tokyo [1].
This sudden shift in weather provides a brief reprieve for residents who have endured a record-breaking heat spell across Japan. The transition from extreme heat to volatile storm activity increases the risk of flash flooding and wind damage in densely populated urban areas.
Weather officials issued a Level 3 heavy-rain warning for Kanagawa Prefecture [1]. A tornado watch was also activated for Tokyo as sudden rain-cloud development swept through the region [1]. These conditions follow a period of extreme temperatures, with six locations across Japan recording 40 °C or higher on July 25 [1].
In Tokyo, the maximum temperature reached 37 °C on Saturday [1]. Forecasts for July 26 indicate a slight cooling trend, with temperatures expected to be approximately three °C lower than the previous day [1].
Despite this temporary drop, meteorologists warn that the extreme heat will return. Temperatures in Kumagaya and Maebashi are projected to reach around 40 °C again after July 29 [1]. This volatility follows a dangerous two-week window from July 12 to July 24, during which the Kanto region faced temperatures near 40 °C and frequent "guerrilla" thunderstorms [3].
An ANNnewsCH weather reporter said, "Level 3 heavy rain warnings were issued in Kanagawa Prefecture, and a tornado watch was just issued for Tokyo."
Local residents are advised to keep umbrellas available and monitor emergency alerts as the atmospheric instability continues to fluctuate between extreme heat and severe precipitation [1].
“Six locations across Japan recorded 40 °C or higher on July 25.”
The rapid oscillation between 40 °C heat and severe thunderstorms suggests a highly unstable atmosphere typical of peak summer in Japan. While the rain provides immediate cooling, the projected return of extreme heat by late July indicates that the broader heat wave remains intact, potentially stressing public health infrastructure and energy grids.
