Typhoon 9 is transitioning into an extratropical low as it moves from the Sea of Japan toward northern Japan [1, 2].
The system's shift in structure creates a dual weather threat, combining severe flooding risks in the north with a dangerous heatwave in the south.
Warning-level heavy rain is expected across northern Japan, including northern Tohoku, Hokkaido, southern Hokkaido, and Hokuriku [1, 2]. This period of intense precipitation is forecast to last from the night of July 15 into the morning of July 16 [2].
While the north faces flooding, southerly winds are pushing high temperatures into eastern and western Japan [1, 2]. These winds are contributing to a series of extremely hot days across the region. General maximum temperatures in eastern and western Japan are expected to reach approximately 35°C [2].
Some areas are forecast to experience even more extreme conditions. In Toyama, the maximum temperature is predicted to hit 38°C [2]. Local authorities are monitoring the situation as the low-pressure system continues its path toward the northern territories.
Weather officials said the storm's power is weakening as it becomes an extratropical low, but the associated moisture and wind patterns remain significant [1, 2].
“Typhoon 9 is transitioning into an extratropical low as it moves from the Sea of Japan toward northern Japan.”
The transition of a typhoon into an extratropical low does not necessarily reduce its impact; rather, it often spreads the weather effects over a wider area. In this case, the system is acting as a pump, drawing moist, hot air from the south into the Japanese mainland while concentrating heavy precipitation in the north, creating simultaneous public health risks from both heat exhaustion and flash flooding.
