Record rainfall kills four, strands thousands at Tokyo's Narita Airport

The rain came down in sheets across Chiba prefecture on Thursday, the kind of deluge that doesn't announce itself politely but arrives as a wall of water. By Friday morning, at least four people were dead. More than six thousand travelers were still sleeping on airport floors at Narita, one of Tokyo's two major international gateways, waiting for a weather system that had turned the region's roads into rivers and its train lines into useless steel.

It was the worst possible timing. Japan was in the middle of one of its busiest holiday weeks, the kind of week when families travel, when airports run at capacity, when the infrastructure of a nation hums at maximum strain. Then the sky opened. In twenty-four hours, some parts of Chiba prefecture—the region that borders Tokyo—received more than thirty-six centimeters of rain. That's fourteen inches of water falling in a single day. The Japan Meteorological Agency, the nation's official weather authority, issued its highest-level rain warning for the first time in its history. Not the second-highest. Not a warning that had been issued before. The first time ever.

Chiba Governor Toshihito Kumagai stood before reporters early Friday morning, his voice carrying the weight of someone who had managed disasters before but never anything like this. "This case was an extremely unusual situation, even by Japan's historical weather standards," he said. He had responded to many emergencies in his career, he told them, but he had never seen anything comparable. The meteorological agency's own officials had used the word "unprecedented" to describe what was unfolding. The rain was shaping up to be something Japan's weather records had never captured.

The human toll was immediate and stark. A man in his sixties or seventies was found on a flooded road. A sixty-six-year-old woman was discovered in her submerged car. A third victim, a man of unknown age, collapsed in the street. A fourth person, whose age and gender remain unidentified, was also confirmed dead. A fifth person was feared dead. A sixth was missing. Soldiers were deployed to help search and recover. Nearly twenty-five thousand households lost power. Landslide warnings blanketed the region.

At Narita airport, the situation had become surreal. More than six thousand people—travelers who had planned to leave Japan, or arrive in it, or simply pass through—found themselves stranded overnight in the terminal. Train services connecting the airport to Tokyo and other destinations were canceled into Friday afternoon. Hundreds more people were trapped at Chiba station after rail service stopped. Some spent the night in emergency shelters. One traveler, speaking to Japan's public broadcaster NHK, tried to find levity in the situation: "I never thought I'd spend the night at the airport but it is what it is and we are learning. We're never going to forget this trip." But the footage from Kashiwa city told a different story—cars submerged up to their headlights, entire streets transformed into temporary lakes.

The major highways that connect Narita to central Tokyo remained closed on Friday. NEXCO East, the operator responsible for those routes, had no choice but to keep them shut. Drivers were forced onto alternate roads, adding hours to journeys that should have taken minutes. Some train service between the airport and Tokyo had resumed by early Friday, but the system was fractured, operating at a fraction of normal capacity.

By Friday morning, the meteorological agency had downgraded its warning from level five to level four—a small acknowledgment that the worst had passed, though the damage was already done. An airport spokesperson said flights were scheduled to resume normal operations. Japan Airlines warned of possible delays but said no cancellations were expected. The machinery of travel would restart. But for the people who had spent the night on airport floors, for the families of those who had died, for the thousands without power in their homes, the return to normal would take far longer. Scientists studying climate patterns have begun warning that these kinds of extreme weather events—the ones that break records, that exceed historical precedent—are becoming more frequent and more intense as human activity warms the planet. What happened in Chiba on Thursday may not be unprecedented for much longer.