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The story
On September 8, 2026, a linear rainband formed over the Tokai region, bringing torrential rain from Aichi to Gifu Prefecture. Nagoya City recorded 104.5mm of rain in the hour leading up to 4:53 PM, surpassing the 2000 Tokai Flood’s 97.0mm to set a new record for heaviest hourly rainfall since observations began. The highest-level evacuation alert, “Emergency Safety Measures,” was issued for the entirety of Nakamura Ward and parts of Nakagawa and Minato Wards, covering roughly 1 million households and 1.98 million people. Trains suspended service for hours, causing severe congestion at Kanayama Station, and hotel rates in the area spiked sharply that night. On 5ch, opinions were divided over whether the Linear Chuo Shinkansen’s drainage systems could handle the flooding, and over which areas would be submerged if the Shonai River were to overflow.
Weathernews@wni_jp
<Nagoya Sets New Record for Hourly Rainfall>
This afternoon (Tue, the 8th), rain clouds developed over the Tokai region, with a linear rainband analyzed over Aichi and Gifu Prefectures bringing torrential rain.
Source: weathernews.jp / Original article here
What people said
That's exactly why I've been against it this whole time — Japan really is a country of idiots.
Don't worry, the Linear line will never actually get finished.
The Linear line has drainage systems in place, so it won't flood.
What happens if it floods?
A million people go underwater.
Even if the Shonai River overflows, only part of Nagoya city actually gets affected.
・It's designed to flood outward first.
・There are sections where the levee is intentionally built lower, so overflow gets diverted into the Shinkawa River, which runs parallel to the Shonai.
・The areas that would still be in trouble are well known, so anyone sensible avoids living there.
Owari's been ruthless about this since way back — when flooding looks imminent, they break the levee on the Mino side.
Ah, the Shinkawa Araizeki floodgate.
That's a system dating back to the Edo period, built to protect Nagoya Castle from flooding.
West Nagoya really is a sketchy area lol
Whenever there's an earthquake or a landslide you all go on and on about how it's the residents' own fault for living somewhere like that, but when it's a flood, suddenly nobody says a word. Double standards much?
It's on the people living in low-lying areas.
That's the Ueda River, which connects to the Tempaku River.
Looks like it's overflowed pretty badly.
In Nagoya, the traffic cones are just bobbing on down the river.
https://video.twimg.com/amplify_video/2097225286823940097/vid/avc1/1280×720/Mc1dY4IvLt8ZLA35.mp4
That's surreal.
Looks like early evening.
The water's probably already receded.
Kind of peaceful, honestly.
Top 3 for 3-hour rainfall
189.5mm — Sakura City
188.5mm — Chiba City, Chuo Ward
183.0mm — Tateyama City
Nagoya
3-hour rainfall topping 200mm practically everywhere
Level 5 flood warnings blanketing a massive area
https://pbs.twimg.com/media/HRsWRN1bIAA8uxo.jpg?name=orig
JR, Meitetsu, the subway, buses — none of them are running. What's even supposed to happen from here?
Guess there's a real chance this happens again during the fall tour season.
【Bad News】
Shop's flooded ＼(^o^)／
Ugh…
https://pbs.twimg.com/media/HRrmCD1bkAAWWV-.jpg:orig#.jpg
https://pbs.twimg.com/media/HRrmCD_bUAAJT_N.jpg:orig#.jpg
The stuff up on the duckboards is fine, but I don't get why they didn't move the stuff sitting directly on the floor before it got soaked.
If it were me, I'd just give up and book a room.
@
Nagoya hotels
A room that's normally 20,000-30,000 yen is going for 130,000 yen tonight only.
What is this??
https://pbs.twimg.com/media/HRsallfbgAADwOj.jpg?name=orig
https://pbs.twimg.com/media/HRsamcKbsAAAVh_.jpg?name=orig
So this is dynamic pricing…
Hotels that pull stunts like this should get dragged through the mud on the internet and social media until they're forced out of business.
Couldn't get home so I was walking from Nagoya, but my body hit its limit… grabbed a GO Taxi back to the misogi venue (fan slang for the concert hall) ✨
Thank god for the shelter 🥹
Gives the same sense of security as being home.
What a wonderful shelter.
https://mainichi.jp/articles/20260908/k00/00m/040/220000c
Nagoya City recorded intense rainfall of 104.5mm in the hour up to 4:53 PM.
This surpassed the record set during the devastating Tokai Flood of September 2000 (97.0mm), making it the heaviest hourly rainfall since records began.
Citing rising river levels and an increased flood risk, Nagoya City issued "Emergency Safety Measures" — the highest-level evacuation alert — for the entirety of Nakamura Ward and parts of Nakagawa, Minato, and other wards.
By 6:10 PM, evacuation orders and related alerts had been issued to roughly 1 million households, totaling 1.98 million people.
Back during the previous Tokai Flood
They need flood countermeasures that can withstand 1.5 times the Tokai Flood, or this isn't going to cut it.
Good work, everyone.
4:30 PM
6:00 PM
If they'd actually taken it seriously, wouldn't it never have flooded like this in the first place?
Background and Talking Points
Nagoya’s previous record for heaviest rainfall was set during the Tokai Flood of September 2000 (97.0mm in one hour), a benchmark still referenced today in disaster-preparedness planning. This latest downpour beat that mark by 7.5mm. “Emergency Safety Measures” is the highest-level evacuation alert, newly created under the 2021 revision of the Basic Act on Disaster Management; it calls on residents of the designated area to secure their safety immediately. It ranks above an evacuation order, but doesn’t necessarily mean “life-threatening danger is imminent right this moment” — since it’s issued broadly across entire administrative wards, the designated area tends to be much larger than the actual flood zone. Opinions on the thread were split over whether the Linear Chuo Shinkansen’s Nagoya station section would flood; JR Central has announced drainage infrastructure for the site, but its effectiveness during heavy rainfall like this remains untested. The flood-risk zones along the Shonai River trace back to the Edo-period Shinkawa Araizeki flood-control system, a historical legacy still reflected in today’s hazard maps.
*This article is excerpted and summarized from the 5ch (Hello! Project board) thread “Nagoya’s Underwaaaaater lolololololololololololololololol” (the garbled title is a common Shift-JIS mojibake glitch on 5ch).
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