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WED · 2026-07-22 · 07:00 GMTBRIEF NSR-2026-0722-94977
News/Japanese agency warns of ‘cruelly hot da/Japan temperatures soar over 40C, marking first 'cruelly hot…
NSR-2026-0722-94977News Report·EN·Public Health

Japan temperatures soar over 40C, marking first 'cruelly hot day'

Japan has experienced its first "kokushobi," or "cruelly hot day," as temperatures surpassed 40C (104F) in three central cities: Tajimi, Gujo, and Toyoda. This new term was introduced in April by Japan's Meteorological Agency (JMA) to specifically warn the public about days reaching this dangerous temperature threshold.

1 hour agoShareSaveAdd as preferred on GoogleKoh EweBBC News - WorldFiled 2026-07-22 · 07:00 GMTLean · CenterRead · 1 min
Japan temperatures soar over 40C, marking first 'cruelly hot day'
BBC News - WorldFIG 01
Reading time
1min
Word count
169words
Sources cited
2cited
Entities identified
10entities
Quality score
100%
§ 01

Briefing Summary

AI-generated
NEWSAR · AI

Japan has experienced its first "kokushobi," or "cruelly hot day," as temperatures surpassed 40C (104F) in three central cities: Tajimi, Gujo, and Toyoda. This new term was introduced in April by Japan's Meteorological Agency (JMA) to specifically warn the public about days reaching this dangerous temperature threshold. The JMA anticipates the extreme heat will persist into next week. The country already uses terms for days exceeding 25C, 30C, and 35C, with "moshobi" denoting "extremely hot days" over 35C. The introduction of "kokushobi" highlights the increasing intensity of global extreme weather events.

Confidence 0.90Sources 2Claims 5Entities 10
§ 02

Article analysis

Model · rule-based
Framing
Public Health
Environmental
Tone
Measured
AI-assessed
CalmNeutralAlarmist
Factuality
0.90 / 1.00
Factual
LowHigh
Sources cited
2
Limited
FewMany
§ 03

Key claims

5 extracted
01

Japan's highest recorded temperature was 41.8C in Isesaki last year.

statistic
Confidence
1.00
02

Nearly 300 out of 914 observation points recorded 'moshobi' (extremely hot days) on Tuesday.

statisticKyodo News
Confidence
1.00
03

Temperatures reached 40C in Tajimi, Gujo, and Toyoda on Tuesday.

factualJapan's Meteorological Agency
Confidence
1.00
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Japan experienced its first 'kokushobi' or 'cruelly hot day' as temperatures surpassed 40C.

factualJapan's weather agency
Confidence
1.00
05

Extreme weather events like heatwaves are becoming more intense globally.

factual
Confidence
0.90
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Full report

1 min read · 169 words
Japan has experienced its first "kokushobi", or "cruelly hot day", as temperatures in parts of the country climbed past 40C (104F). The term was introduced in April by the country's weather agency to describe days when temperatures reach 40C, with the aim of more effectively warning the public about dangerous heat.On Tuesday, temperatures in three central Japanese cities - Tajimi, Gujo, and Toyoda - hit that threshold. The heat is expected to continue into next week, said Japan's Meteorological Agency (JMA). It comes as extreme weather events like heatwaves are becoming more intense around the world. Last year, Japan saw its highest-ever temperature of 41.8C in the city of Isesaki.Japan currently already has terms for days over 25C, 30C and 35C. Days with temperatures exceeding 35C are known as moshobi - or "extremely hot days".But its more severe counterpart uses the term koku - meaning harsh or cruel - to describe the heat.Nearly 300 out of the country's 914 observation points recorded a moshobi on Tuesday, Kyodo News reported.
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Entities

10 identified
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Keywords & salience

8 terms
cruelly hot day
1.00
kokushobi
1.00
extreme weather
0.90
heatwaves
0.80
japan
0.70
temperatures
0.60
japan's meteorological agency
0.50
moshobi
0.40
§ 07

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