Eastern and northern Japan face sudden thunderstorms and heavy rain that could cause road flooding this Sunday [1], [2].
These weather patterns pose an immediate risk to commuters and residents in the region, as intense rainfall can lead to rapid flash flooding in urban areas.
Meteorologists said that developing thunderclouds are driving the forecast for sudden, intense storms [1], [2]. In some areas, rainfall intensity is expected to exceed 50 mm per hour [1]. This volume of water often leads to the inundation of roads, and low-lying areas within a short timeframe.
Beyond the immediate storm risk, the region is preparing for the arrival of Typhoon No. 15. The storm is forecast to make landfall in the Tohoku region on Tuesday, Sept. 11, which is a public holiday [1], [2].
Temperature forecasts for the period show significant variation across the country. Tokyo is expected to reach a maximum temperature of 33 °C [1]. Meanwhile, Nagoya, Osaka, and Hiroshima are forecast to hit 35 °C [1].
Northern regions will experience cooler conditions. Sapporo is expected to reach 26 °C and Kushiro 24 °C [1]. Aomori will see a maximum temperature of 25 °C, which is nine °C lower than the previous day [1].
Local authorities said they are monitoring the approach of Typhoon 15 as it moves toward the northern coast. The combination of current thunderstorm activity and the approaching typhoon creates a volatile weather window for the start of the week [1], [2].
“Rainfall intensity is expected to exceed 50 mm per hour.”
The convergence of localized thunderstorm activity and a major typhoon landfall on a public holiday increases the risk of infrastructure strain. Because Sept. 11 is a holiday, higher volumes of travelers in the Tohoku region may be caught in hazardous conditions, complicating evacuation and emergency response efforts.
