TOKYO — The Japan Meteorological Agency (JMA) issued an urgent weather alert on Sunday, warning millions of residents across Tokyo and six surrounding prefectures to prepare for life-threatening rainfall as a powerful typhoon and a stagnant weather front converge over the region.
The severe weather system is expected to impact Tokyo, Saitama, Kanagawa, Chiba, Shizuoka, Aichi, and Mie heading into Monday. Forecasters are particularly concerned about the potential formation of a “linear rainband”—a stationary line of intense, persistent cumulonimbus clouds that can dump enormous volumes of water on a localized area in a matter of hours.
In its emergency briefing, the JMA warned that the combination of moisture-laden air funneled by the typhoon and the existing front creates a volatile atmosphere. These linear rainbands are known for their ability to cause sudden, catastrophic flash flooding, mudslides, and urban inundation. Authorities have urged residents in the affected zones to monitor local updates closely and finalize any emergency preparations before the conditions deteriorate overnight.
“The risk of heavy rain is escalating rapidly,” a JMA spokesperson stated during a press conference on Sunday. “We are advising people in these seven prefectures to exercise extreme caution and to stay away from rivers, steep slopes, and low-lying areas. If you are in a location vulnerable to flooding or landslides, do not wait for an official evacuation order if you feel your situation is becoming unsafe.”
Disruption to infrastructure is highly likely as the storm system approaches. Major railway operators and airlines have already begun advising passengers to check for potential service suspensions and cancellations early Monday morning, as heavy winds and restricted visibility could affect commuter transit lines throughout the Kanto and Chubu regions. Local municipal governments have opened emergency shelters, and emergency response teams are being placed on high alert to handle potential search-and-rescue operations.
The forecasted rainfall amounts are expected to be significantly higher than the average for this time of year, with some areas predicted to receive a month’s worth of rain in a single 24-hour period. Urban centers, including the Tokyo metropolitan area, are at high risk of basement flooding and drainage system overwhelm.
Government officials are calling on businesses to consider flexible work arrangements or remote operations to minimize the number of people on the roads during the peak of the storm. Residents are strongly encouraged to prepare “go-bags” containing essential supplies, including water, non-perishable food, flashlights, and power banks, in case of prolonged power outages.
As the situation develops, the JMA continues to update its radar data, noting that the intensity and exact track of the rainbands remain unpredictable. Citizens are urged to rely on official government websites and NHK broadcasts for the most accurate and timely information.
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