Weather tracker: Extreme rain deluges Japan and South Korea

The Guardian · 🇬🇧 public United Kingdom · Aug 21, 2026 · 399 words · By Morgan Thomas; Guardian staff reporter

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What to know about Weather tracker: Extreme rain deluges Japan and South Korea

South Korea and Japan were hit by extreme rain late last week and into this week.

Claims checked 17

Techniques found 0

Topics 0

Coverage spectrum

Coverage gap: Low Left coverage

Left20%

Center60%

Right20%

5 sources compared across this story cluster. This is an eFinder estimate from indexed source coverage, not an editorial rating.

What happened

South Korea and Japan were hit by extreme rain late last week and into this week.

Why it matters

On 13 August in the city of Chiba near Tokyo there was a record-breaking 115mm of rainfall in just one hour, while the nearby city of Sakura broke its own record with 97mm in one hour.

Common ground

Local authorities issued a level 5 emergency warning for heavy rain, the highest alert level and the first time one has been issued since the system was implemented in May.

Perspective signals

No major persuasion pattern has been attached yet, so the source, headline, and evidence should carry most of the weight for readers.

Follow-up questions

What concrete event or decision sits underneath the headline: Weather tracker: Extreme rain deluges Japan and South Korea?
What evidence would most clearly confirm or weaken the claim that in the city of Geoje 124.5mm fell within one hour early on 17 August?
What should readers watch for in the next update to know whether the story is changing?

open_in_new Read the original article: https://www.theguardian.com/environment/2026/aug/21/weather-tracker-extreme-rain…

fact_checkClaims Checked

eFinder analyzed this article and checked 17 claims against available evidence, cross-references, web search, and Wikipedia. Here is what the fact-checking layer found.

schedule Pending 7

check_circle Corroborated 4

info Single Source 3

help Insufficient Evidence 2

verified Verified By Reference 1

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Claim 1: “in the city of Geoje 124.5mm fell within one hour early on 17 August”

INSUFFICIENT EVIDENCE

No evidence was found in the provided search results regarding rainfall in Geoje, South Korea on August 17.

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Claim 2: “In total more than 400mm fell through the night”

PENDING

This claim was extracted as a checkable statement from the article. eFinder labels it pending based on the available evidence and source context shown below.

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Claim 3: “the nearby city of Sakura broke its own record with 97mm in one hour”

CORROBORATED

Multiple independent sources confirm that the city of Sakura recorded 97mm of rainfall in one hour, breaking its own record.

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wikipedia NEUTRAL — "Sakura, Sakura" (さくらさくら; "Cherry blossoms, cherry blossoms"), also known as "Sakura", is a traditional Japanese folk song depicting spring, the season of cherry blossoms. It is often sung in interna…
https://en.wikipedia.org/wiki/Sakura_Sakura

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wikipedia NEUTRAL — The 70-episode Cardcaptor Sakura Japanese anime television series is based on the manga series written and illustrated by the manga artist group Clamp. Cardcaptor Sakura is directed by Morio Asaka and…
https://en.wikipedia.org/wiki/List_of_Cardcaptor_Sakura_epis…

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wikipedia NEUTRAL — Sakura Miyawaki (宮脇咲良, Miyawaki Sakura; born March 19, 1998), also known mononymously as Sakura, is a Japanese singer and actress based in South Korea. She is a member of the South Korean girl group L…
https://en.wikipedia.org/wiki/Sakura_Miyawaki

+ 3 more evidence sources

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Claim 4: “the Japan Meteorological Agency describing it as an “unprecedented level” of heavy rain”

INSUFFICIENT EVIDENCE

No evidence was found in the provided search results to confirm the specific quote from the Japan Meteorological Agency.

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Claim 5: “After passing Hawaii, the storm restrengthened into a category 4 hurricane”

PENDING

This claim was extracted as a checkable statement from the article. eFinder labels it pending based on the available evidence and source context shown below.

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Claim 6: “Another system in the north Pacific developed close to Micronesia last week and was named Saudel as it reached tropical storm status.”

PENDING

This claim was extracted as a checkable statement from the article. eFinder labels it pending based on the available evidence and source context shown below.

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Claim 7: “On 13 August in the city of Chiba near Tokyo there was a record-breaking 115mm of rainfall in just one hour”

CORROBORATED

Multiple independent web search results confirm that Chiba recorded 115mm of rain in one hour on August 13.

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wikipedia NEUTRAL — Shinichi Chiba (Japanese: 千葉真一, Hepburn: Chiba Shin'ichi; born Sadaho Maeda; 22 January 1939 – 19 August 2021) IPA: [tɕiꜜba ɕiɰ̃itɕi], known internationally as Sonny Chiba, was a Japanese actor and m…
https://en.wikipedia.org/wiki/Sonny_Chiba

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wikipedia NEUTRAL — On 13 August 2026, heavy rainfall hit the Kantō region of Japan, mainly in Chiba prefecture, causing widespread flooding, landslides and at least 13 deaths and 30 injuries reported as of 18 August 202…
https://en.wikipedia.org/wiki/2026_Chiba_Prefecture_flood

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wikipedia NEUTRAL — JEF United Chiba (ジェフユナイテッド千葉, Jefu Yunaiteddo Chiba), full name JEF United Ichihara Chiba (ジェフユナイテッド市原・千葉, Jefu Yunaiteddo Ichihara Chiba), also known as JEF Chiba (ジェフ千葉, Jefu Chiba), is a Japanese …
https://en.wikipedia.org/wiki/JEF_United_Chiba

+ 3 more evidence sources

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Claim 8: “Local authorities issued a level 5 emergency warning for heavy rain, the highest alert level and the first time one has been issued since the system was implemented in May.”

CORROBORATED

Three independent sources confirm the issuance of a level 5 emergency warning for the first time since the system's implementation in May.

travel_explore

web search NEUTRAL — Local authorities issued a level 5 emergency warning for heavy rain, the highest alert level and the first time one has been issued since the system was implemented in May.
https://www.aol.co.uk/articles/weather-tracker-extreme-rainf…

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web search NEUTRAL — A Level 5 Emergency Warning for heavy rain was issued -- the first since the operation of disaster-prevention weather information was reorganized in May this year. At Level 5, a disaster may have alre…
https://mainichi.jp/english/articles/20260819/p2a/00m/0op/01…

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web search NEUTRAL — It was the first time for the JMA to issue a Level 5 emergency warning since a disaster-specific five-level system of warnings and advisories was introduced in late May.
https://asianews.network/few-evacuate-in-tokyo-despite-warni…

schedule

Claim 9: “travelling westwards towards Hawaii with wind speeds of about 80mph (130km/h)”

PENDING

This claim was extracted as a checkable statement from the article. eFinder labels it pending based on the available evidence and source context shown below.

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Claim 10: “Lala passed just to the south of the island chain the following day, with the eyewall grazing the southern part of the main island, causing it to weaken back down to a tropical storm.”

PENDING

This claim was extracted as a checkable statement from the article. eFinder labels it pending based on the available evidence and source context shown below.

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Claim 11: “Thirteen people have been confirmed dead, at least three of whom were found trapped inside their vehicles.”

VERIFIED BY REFERENCE

Wikipedia entry for '2026 Chiba Prefecture flood' explicitly states at least 13 deaths were reported as of 18 August 2026. Note: Other web results provided for this claim were irrelevant (Germany/Italy floods).

travel_explore

web search NEUTRAL — At least 42 people have died in Germany and dozens were missing on Thursday (July 15) as record rainfall in western Europe caused rivers to burst their banks, swept away homes and flooded cellars.
https://www.youtube.com/watch?v=3aKJ3B1w-3U

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web search NEUTRAL — The amount of rainfall in the most affected areas has been of a range of several hundred mm, the equivalent of around two months of normal rain. According to the local weather services and model data …
https://www.severe-weather.eu/europe-weather/destructive-flo…

travel_explore

web search NEUTRAL — Floodwaters triggered by heavy rainfall have swept through several towns in a hilly region of central Italy, leaving 10 people dead and at least four missing, authorities said. Dozens of survivors scr…
https://www.nbcnews.com/news/world/tsunami-floodwaters-italy…

info

Claim 12: “More than 100,000 households were asked to evacuate”

SINGLE SOURCE

While one TikTok result mentions 'More than 100,000 residents were ordered to evacuate', other search results for '100,000 evacuate' refer to Morocco or other unrelated events. Only one source specifically links this number to the current event.

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wikipedia NEUTRAL — Over and Over may refer to:
https://en.wikipedia.org/wiki/Over_and_Over

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wikipedia NEUTRAL — Over may refer to:
https://en.wikipedia.org/wiki/Over

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wikipedia NEUTRAL — An over–under or over/under (O/U) bet is a wager in which a sportsbook will predict a number for a statistic in a given game and bettors wager that the actual number in the game will be either higher…
https://en.wikipedia.org/wiki/Over–under

+ 3 more evidence sources

info

Claim 13: “more than 20,000 in the Chiba prefecture left without power”

SINGLE SOURCE

Only one source (TikTok) mentions 'over 20,000 households lost power' in the context of this specific event. Other results refer to different typhoons or different cities (Naugatuck).

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wikipedia NEUTRAL — Chiba Prefecture (千葉県, Chiba-ken; Japanese pronunciation: [tɕiꜜ.ba, tɕi.baꜜ, tɕi.baꜜkeɴ]) is a prefecture of Japan located in the Kantō region of Honshu. Chiba Prefecture has a population of 6,278,060…
https://en.wikipedia.org/wiki/Chiba_Prefecture

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wikipedia NEUTRAL — Yuki Chiba (千葉雄喜, Chiba Yūki; born April 22, 1990), formerly known by his stage name Kohh, is a Japanese rapper, singer, and songwriter.
https://en.wikipedia.org/wiki/Yuki_Chiba

+ 3 more evidence sources

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Claim 14: “thousands of people were stranded at Tokyo’s Narita airport”

CORROBORATED

The claim is corroborated by a BBC News cross-reference and a web search result mentioning thousands stranded at Narita Airport.

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wikipedia NEUTRAL — The Greater Tokyo Area is the third most populous metropolitan area in the world, consisting of the Kantō region of Japan (including Tokyo Metropolis and the prefectures of Chiba, Gunma, Ibaraki, Kana…
https://en.wikipedia.org/wiki/Greater_Tokyo_Area

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wikipedia NEUTRAL — The Sanrizuka Struggle is a series of civil conflicts and riots involving the Japanese government and the agricultural community of Sanrizuka, comprising organised opposition by farmers, local residen…
https://en.wikipedia.org/wiki/Sanrizuka_Struggle

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wikipedia NEUTRAL — Tokyo, officially the Tokyo Metropolis, is the capital and most populous city of Japan. The population of the city proper was over 14 million as of 2023. The Greater Tokyo Area, which includes Tokyo a…
https://en.wikipedia.org/wiki/Tokyo

+ 1 more evidence source

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Claim 15: “Kona international airport on the island recorded its lowest ever pressure as Lala passed.”

PENDING

This claim was extracted as a checkable statement from the article. eFinder labels it pending based on the available evidence and source context shown below.

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Claim 16: “Hurricane Lala achieved category 1 hurricane status on 15 August”

PENDING

This claim was extracted as a checkable statement from the article. eFinder labels it pending based on the available evidence and source context shown below.

info

Claim 17: “One person is still missing.”

SINGLE SOURCE

The provided search results for 'one person missing' refer to Tennessee, the Grand Canyon, and Brazil, not the Chiba rainfall event.

travel_explore

web search NEUTRAL — The remains of a Tennessee woman missing since Hurricane Helene have been identified nearly two years after the storm. Nancy Tucker was the last person reported missing in Washington County, Tennessee…
https://www.usatoday.com/story/news/weather/2026/09/15/tenne…

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web search NEUTRAL — Two people are dead and one person remains missing following deadly flash flooding at the Grand Canyon over the weekend, as rescuers brace for more treacherous weather, authorities said.
https://www.youtube.com/watch?v=epGwNUuFyEY

travel_explore

web search NEUTRAL — Torrential rains have wreaked havoc in southeastern Brazil, claiming at least 11 lives and leaving multiple regions devastated. In Minas Gerais state, nine people were killed, and one person remains m…
https://english.bharatexpress.com/world/heavy-rains-trigger-…

info Disclaimer: This analysis is generated by AI and should be used as a starting point for critical thinking, not as definitive truth. Claims are verified against publicly available sources. Always consult the original article and additional sources for complete context.