Powerful typhoon Dujuan is battering Tokyo and is forecast to bring record rainfall
More than 1.9 million people across five prefectures are under evacuation orders, with 50,000 households without power
In Kanagawa, firefighters fear a woman has been buried alive after a landslide crushed a house, while a man in Chiba was taken to hospital after being trapped while working to clear debris
Some 300 flights have been cancelled and some train services suspended
Dujuan has sustained winds of 130km/h (80.8mph) and gusts of up to 194km/h
The storm is the latest in a wave of storms in the Pacific, made more intense by this year's "super El Niño", which has warmed the ocean and fuelled the formation of storms
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A further 300,000 people have been urged to evacuate because of Typhoon Dujuan.
In an update to its figures, Japan's ministry of internal affairs says 1,908,645 people were ordered to evacuate in six prefectures - Ibaraki, Chiba, Tokyo, Kanagawa, Shizuoka and Saitama.
The evacuations are not mandatory.
Tokyo's disaster prevention agency is warning residents to avoid basements, with the area under a level 3 heavy rain warning.
In two cartoons posted on social media, the agency explains: "Basements are prone to flooding, and since you may not be able to see outside, there is a risk of being trapped."
Water can "rush" into a basement at any moment so residents should be "extremely careful", the warning adds.
The disaster prevention agency also says to look out for manhole covers, which may dislodge and pose a danger during flooding.
Image source, ReutersTokyo is under a heavy rain warning
As many as 50,890 households in Japan are without power, according to Tokyo's power company (TEPCO Power Grid).
Chiba prefecture is the worse affected area, with 41,130 households currently impacted.
Other regions affected by power cuts include Tochigi, Saitama, Kanagawa, Yamanashi and Shizuoka.
Chie Kobayashi
Reporting from Japan
Sodegaura City Fire Department in Chiba prefecture has told the BBC a man in his 50s has been rescued after getting trapped while working to clear debris at a landslide site.
The department says at 15:00 local time, the worker and heavy machinery fell into a bamboo thicket.
He was then rescued approximately three hours later and has been taken to hospital, an official adds.
Hundreds of flights out of Japan have been cancelled as Typhoon Dujuan is forecast to bring record-breaking levels of rainfall.
Japan Airlines have cancelled 135 flights, while All Nippon Airways called off 140 of its flights.
The storm has led to power outages and authorities have ordered more than 1.6 million residents to evacuate across five prefectures, including the capital Tokyo.
Image source, Getty Images
Image source, Getty Images
Image source, Getty Images
Image source, Reuters
Kurumi Mori
Tokyo correspondent
In Sodegaura city, in the Chiba prefecture, authorities have issued a level five alert - the highest one - for about 40,000 residents.
Residents have been told to "protect their lives" and urged to get above the second floor, away from slopes.
Chiba prefecture is 39 km (24 miles) east of Tokyo.
Kurumi Mori and Chie Kobayashi
Reporting from Japan
More than 1.6 million people have been told to evacuate from their homes due to Typhoon Dujuan.
Japan's ministry of internal affairs says 1,674,084 people in Ibaraki, Chiba, Tokyo, Kanagawa and Shizuoka are subject to evacuation orders.
The evacuations are not mandatory.
Warnings: Japan's meteorological agency has issued a level five emergency warning - the highest level - for flooding and landslides in Oshima town and parts of Izu islands, which are south of Tokyo. Areas in the northern Izu islands, Chiba, Kanagawa and Shizuoka are at a level four alert, according to the weather agency.
Storm's journey: The storm has passed through the Izu archipelago and will continue to head north-eastwards, parallel to the coast of Honshu, over the next 24 hours.
Winds: Typhoon Dujuan - the country's 25th typhoon this year - is producing sustained winds at its centre of 130km/h (80mph), with gusts up to 194km/h (121mph).
Rainfall: Rain is forecast to be heavy and persistent for the rest of Monday, with up to 250mm (10in) around the Kanto region. The storm has already triggered landslides there.
Typhoon's impact: There are power outages in about 4,000 households in the Kanto region. A resident near the Meguro River tells the BBC he will be staying put on his third-floor apartment as water levels in the river swell significantly.
Chie Kobayashi
Reporting from Japan
Yokosuka City Fire Department in Kanagawa prefecture has told the BBC they received a call from a man reporting his house had been crushed by the landslide.
A woman in her 60s, who lives in the house, may have been have been swept away and is believed to have been buried alive, says the department's Yasuhiro Kaneko.
Kaneko adds firefighters are carrying out rescue operations, noting it is still raining heavily at the scene.
Yokosuka is a city about one and a half hours south of Tokyo.
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Chie Kobayashi
Reporting from Japan
Japan's Meteorological Agency says it is "extremely likely that some form of disaster has already occurred in landslide-prone areas and similar zones" and urges people to ensure their safety "immediately", warning "there is an imminent threat to life".
"There are areas in the northern Izu Islands, Chiba prefecture, Kanagawa prefecture and Shizuoka prefecture where the situation corresponds to Alert Level 4," the agency's chief forecaster Takuya Hosomi says in a news conference.
"Please check the disaster risk in the municipality where you are currently located and ensure you evacuate before the municipality issues a Level 4 evacuation order."
It is believed that the typhoon "developed more than expected" because its movement slowed slightly in the waters off the Izu Islands, where sea surface temperatures are high, Hosomi adds.
Image source, ReutersRough waves hit the coast in Kanagawa prefecture
Authorities in Chiba prefecture have warned residents to brace for heavier rains starting on Monday night - which is a few hours from now local time.
Typhoon Dujuan is expected to barrel past waters off Chiba prefecture.
Level Four alerts for heavy rain and landslides have been issued in many municipalities across the prefecture, authorities say on social media.
"Please take actions to ensure your personal safety," the post adds.
Image source, Getty ImagesTokyo is being lashed with rain as Typhoon Dujuan nears.
But it was just months ago that the city - and other parts of Japan - was battling an unprecedented heatwave.
In late July, temperatures in parts of the country climbed past 40C and tens of thousands of people were sent to hospital for heatstroke. Several lions in a Tokyo zoo also died as a result of the unbearable heat.
Since then, however, the heat has dissipated as rain broke over Tokyo and its surrounding region.
Last month, tropical storm Chan-hom, made landfall in southern Ibaraki Prefecture, northeast of Tokyo, bringing powerful winds and rain.
Sarah Keith-Lucas
BBC Weather
Typhoon Dujuan has just passed through the Izu Archipelago in the south of Japan, and will continue to track north-eastwards, parallel to the coast of Honshu over the next 24 hours.
The storm is currently producing sustained winds around its centre of 130km/h, with gusts up to 194km/h.
Whilst the centre of the storm will remain well offshore, damaging wind gusts on the east coast of Honshu are still expected to reach over 90km/h, and around 75km/h in the centre of Tokyo.
Rain will be heavy and persistent throughout the rest of Monday, with totals up to 250mm (10 in) around the Kanto Region. This is enough to bring a high risk of flooding and landslides.
Kurumi Mori
Tokyo correspondent
A resident in Meguro, a Tokyo ward, tells me he’s been keeping an eye on the water level of the Meguro River, which runs through neighbourhoods to Tokyo Bay and spans nearly 8 km.
He’s been getting mobile alerts all day about staying away from the water and urging him to evacuate.
When he went to Shibuya today, he noticed that buses and trains were quite empty.
He was wearing boots and used an umbrella, he says, but experienced such heavy rain that water seeped in through his shoe's stitching.
On his bus ride home he saw the river swell up significantly compared to just hours earlier.
He's now got home and says he will be staying at his third floor apartment until the storm passes.
Image source, AFP via Getty ImagesChiba prefecture was hit by record rainfall last month
The northwestern Pacific has found itself in the middle of an unusually active typhoon season this year.
According to an August report by forecaster Tropical Storm Risk, typhoon development this year is expected to be 60% above the historical average as a result of a strengthened El Niño - a natural phenomenon that changes weather patterns around the world, pushing some regions into drought whilst others experience stronger typhoons and flooding.
Typhoon Dujuan is the 25th typhoon to form in the region this year.
But even before the typhoon this week, Japan's Chiba prefecture was already hit by record rainfall.
Last month, eight people were killed amid the torrential downpour, which triggered the highest-level emergency warnings and caused widespread flooding across 22 municipalities.
As rains lash eastern Japan, here are some of the photos we're getting from the scene over the past day:
Image source, Reuters
Image source, EPA/Shutterstock
Image source, AFP via Getty ImagesA woman in her 40s has sustained minor injuries after a landslide in Sodegaura city, Chiba prefecture, according to local media reports.
Traffic has been affected as roads become flooded.
Alerts for floods, heavy rain and landslides have been issued across Chiba prefecture, where the typhoon is expected to pass later today.
Kurumi Mori
Tokyo correspondent
In Tokyo, where I am now, rain is hitting our windows hard and winds are getting stronger. So I suspect we’ll see more updates as the typhoon approaches the Kanto region, where Tokyo is located.
It's very, very dark in Shibuya and there are heavy rains. My doorman said he saw people slipping at the apartment entrance, and warned us to be careful.
The worst is likely to come in next couple of hours.
Also, today is a holiday - it’s Silver Week in Japan, so some people are saying that this weather has affected their holidays travels.
The popular tourist hub of Shibuya has been issued a level three alert in Japan's five-tier weather alert system. At level three, elderly people, those with disabilities, and others are warned to evacuate from affected areas.
Image source, Getty ImagesTyphoon Dujuan, which is expected to barrel past Japan's eastern coast on Monday, comes as Japan is hosting the Asian Games.
The Games offiically opened over the weekend in the city of Nagoya and wider Aichi prefecture.
An equestrian event, originally scheduled for Monday, has now been postponed to Tuesday, Reuters reported.
Kosei Inoue, Japan's chef de mission for the Games, told reporters that they were holding meetings with the Japan Olympic Committee to ensure they were "fully prepared and capable of responding appropriately to these situations".
"All we can do is to pray that the worst-case scenario will not happen," another sports official said, the Asahi Shimbun reported.
About 4,000 participants are staying aboard the Costa Serena cruise ship during the Games.
The ship would have to be relocated if the typhoon hits the area and only return after the threat passes. Its residents will have to remain on board during the process, the Asahi Shimbun reported.
