At least five people died in eastern Japan after "unprecedented" heavy rain that left thousands stranded at Narita airport overnight and snarled up roads and rail services, authorities said on Friday.
This month is already the wettest August recorded by the Chiba weather station in 60 years, Japan Meteorological Agency (JMA) website data shows, with more than 30 centimetres of rain in 24 hours.
The torrential downpours late Thursday triggered landslide warnings and power outages, with forecasters issuing the highest-level heavy rain warning for the Chiba region for the first time.
Scientists say human-driven climate change is making extreme weather more frequent, prolonged and intense.
In rural Chiba, more than a dozen cars were abandoned on low-lying roads, a journalist saw.
At Narita, sleeping bags piled up as passengers slept all over the terminal, with massive lines forming for check-in across the airport.
A traveller from the United Kingdom who gave his name as Philip said that he had to go through a nine-hour journey, including a taxi ride, before finally arriving at the airport on early Friday morning.
With a sleeping bag in hand, he said he has "just been trying to get some sleep and watching Netflix". "Just get on with it, really. Nothing else you can do", he said.
At Chiba's disaster management meeting convened on Friday afternoon, an official said five people were confirmed dead.
The prefecture had previously said those killed included a man in his 60s or 70s found floating in a flooded road and a 66-year-old woman stuck in her submerged car.
Among other fatalities were a man of unknown age who was found collapsed on the street and a person of undetermined gender and age.
Public broadcaster NHK reported as many as eight people may have died.
Meanwhile, close to 26,000 households across Chiba prefecture were without power, the disaster management office said.
More than 80 homes flooded in cities such as Ichikawa, Kashiwa and Sakura. Additionally, close to 90 homes saw water seeping in below the floorboards.
"I never thought I'd spend the night at the airport, but it is what it is and we are learning", one stranded air traveller said. "We're never going to forget this trip", he said.
A JMA official told a news conference on Thursday that this was "shaping up to be an unprecedented level of heavy rain".
Around 6,000 people were stranded overnight at Narita, one of two main airports serving Tokyo, with many trains to and from there cancelled until Friday afternoon, the Chiba disaster office said.
Users on social media said that airport staff handed out free water, food and sleeping bags. Hundreds of people were also left stranded in Chiba station due to suspended train services, a journalist saw.
Hundreds spent the night in shelters in Chiba, NHK reported, showing cars in water up to the headlights in Kashiwa city.
"This happened all of a sudden, so it was a complete surprise. The power is out, so I'm worried whether I can open my business in the next couple of days", a woman in Chiba's Ichikawa city said on Thursday.
The level-5 warnings of heavy rain were all downgraded to level-4 as of Friday morning.
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