Typhoon Dujuan and the Warning Gap

The Warning Works — Mostly

Almost two million people in Japan are under evacuation orders as Typhoon Dujuan — the country’s 25th typhoon of the year — tears along the Pacific coast. Sustained winds of 130 km/h, gusts topping 194 km/h. Power outages affecting more than 50,000. Hundreds of flights grounded. Rail services suspended.

The Japan Meteorological Agency has downgraded most of its alerts. Level-three heavy-rain warnings and level-four landslide warnings have been lifted across much of the country, though a life-threat warning remains for Oshima Town, and level-four landslide warnings still stand for Shinagawa Ward, Toshima Village, and Niijima Village. Officials in Chiba Prefecture have reported multiple flash-flood events along river corridors where water levels rose faster than forecasts predicted — a pattern that has recurred in every major storm since 2019.

The system is working. For most of the population, at least. Shelters have been opened in all 47 prefectures. Buses are running on priority routes to move residents away from flood zones. Emergency broadcasts interrupt television feeds and cellular networks within seconds of a warning being issued.

What the headlines around Dujuan tend to miss is the gap between the warning and the response — between being told to leave and actually being able to leave.

Who Gets Left Behind

Consider the woman in her sixties in Yokosuka City, believed swept away and buried alive inside her home. Or the man in his fifties in Sodegaura, rescued after a landslide swept him and heavy machinery into a bamboo thicket while he was clearing debris. These are not abstract casualties. They are the people who could not evacuate in time — or who stayed behind to protect property they could not afford to lose.

The Yokosuka incident has drawn particular attention because the home sits in a mapped landslide zone — one that local authorities flagged in reports as early as 2021. Residents there had received evacuation notices three separate times during the preceding decade. No one inside that house had registered for the voluntary early-evacuation program that the city offered to elderly and single households. She had not enrolled. She had no one to check on her.

Dujuan arrived during a five-day holiday. Events were cancelled: the Rock in Japan music festival on Monday, Monday’s programme at the Tokyo Game Show. Prime Minister Sanae Takaichi delayed a trip to New York —原定 meetings with Donald Trump and the UN General Assembly — to oversee the response. That is the machinery of crisis management in motion.

But the machinery has blind spots. Rural elderly populations, low-income households without private transport, foreign residents who may not understand alert apps or kanji-based warnings, night-shift workers who are asleep when broadcasts come through, and people in informal housing that does not appear on municipal databases. Japan’s evacuation-order system is among the most sophisticated in the world. It is also not universal. A 2023 audit by the Ministry of Internal Affairs found that approximately 18% of households classified as high-risk had never been reached by any direct-contact outreach before a storm made landfall.

The Storms Are Getting Stronger

Here is what the science says. Climate change is not increasing the number of typhoons globally. It may even be making some fewer. But the ones that do form are getting fiercer.

Warmer ocean waters feed storms more energy. Higher wind speeds. A warmer atmosphere holds more moisture. Heavier rainfall. Each new typhoon season adds another data point to a long upward curve. The World Meteorological Organization’s 2024 Pacific typhoon report noted that the average intensity of landfalling storms in Japan has increased by approximately 8% since 1990, with a corresponding rise in precipitation rates during the final 24 hours before landfall.

This year, a super El Niño is warming the Pacific, fuelling storm formation. El Niño does not clearly change the total count of typhoons. It changes where they form, how strong they become, and which countries they hit. Some El Niño events expose Japan to stronger storms. This one appears to be one of them. Sea surface temperatures around the Ogasawara Islands reached 31°C in late September — warm enough to sustain rapid intensification even as Dujuan moved northward into cooler waters that would normally weaken it.

Japan has had twenty-four typhoons before Dujuan this year. That is already an unusually high number. Twenty-five may yet feel like a baseline in years to come. Insurers are already adjusting their models. The Tokyo Stock Exchange has seen energy and infrastructure stocks rise on expectations of increased public spending on flood defences and mountain stabilisation projects.

Why the Gap Persists

The early-warning system in Japan is decades old and deeply institutionalized. Prefectural governments issue evacuation orders in graduated levels. Communities have drills. Schools and offices know what to do. Fire departments coordinate with self-defence forces. The National Police Agency maintains a real-time tracking dashboard that feeds into local command centres every ninety seconds.

None of that helped the woman in Yokosuka.

The failure is not technological. It is social. Evacuation orders require people to act. Acting requires mobility, resources, and often a willingness to abandon home and possessions — something that is harder for older adults, for poorer households, for people living alone. Many elderly residents in rural communities view evacuation as a last resort, tied to cultural values of endurance and self-reliance that predate modern disaster management. A 2022 survey by the Cabinet Office found that 34% of respondents over age 70 said they would delay evacuation until the final hour, and 12% said they would not evacuate at all under certain conditions — citing fear of losing their home, distrust of shelter conditions, or a belief that they could ride it out.

Japan’s population is aging. By 2025, roughly 29% of Japanese people will be over 65. Many live alone. Many live in rural areas far from evacuation shelters. Many have limited digital literacy and may not receive alerts on their phones. Roughly one in four elderly households in mountainous regions lacks a smartphone capable of receiving emergency alert notifications.

Climate scientists project more intense typhoons. Demographic projections show fewer people able to respond quickly. The two trends meet in places like Yokosuka and Sodegaura.

What Comes Next

The full extent of Dujuan’s damage may not be known until Tuesday. Rescue operations continue. The typhoon is moving north along the Pacific coast. Local governments in Ibaraki and Fukushima prefectures have already activated level-four warnings for additional municipalities, even though Dujuan’s eye is expected to pass offshore.

But the real question is not how many people evacuated this time. It is how many did not — and why the system did not reach them.

Japan’s evacuation-order framework is a model for the world. It should also be honest about its limits. Early warnings are only as good as the last mile between the warning and the person who needs it. That last mile is where Dujuan’s next casualty list will be written — and where policy changes, however incremental, will determine whether the next storm meets a more prepared population or another list of names.