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FRI · 2026-04-17 · 18:19 GMTBRIEF NSR-2026-0417-70407
News/Japan reveals new name for 40C-and-hotter days after blister…
NSR-2026-0417-70407News Report·EN·Environmental

Japan reveals new name for 40C-and-hotter days after blistering summer

After experiencing its hottest summer on record, Japan's Meteorological Agency (JMA) introduced "kokushobi," translated as "cruelly hot," "brutally hot," or "severely hot day," to describe days reaching 40C (104F) or higher. The term was selected as the most popular choice in a national online survey conducted in February and March with approximately 478,000 responses.

BBC News - WorldFiled 2026-04-17 · 18:19 GMTLean · CenterRead · 1 min
Japan reveals new name for 40C-and-hotter days after blistering summer
BBC News - WorldFIG 01
Reading time
1min
Word count
153words
Sources cited
1cited
Entities identified
3entities
Quality score
100%
§ 01

Briefing Summary

AI-generated
NEWSAR · AI

After experiencing its hottest summer on record, Japan's Meteorological Agency (JMA) introduced "kokushobi," translated as "cruelly hot," "brutally hot," or "severely hot day," to describe days reaching 40C (104F) or higher. The term was selected as the most popular choice in a national online survey conducted in February and March with approximately 478,000 responses. The new designation aims to categorize and communicate extreme heat events, which are becoming increasingly frequent and intense due to human activities. Japan already uses specific terms for days exceeding 25C, 30C, and 35C. The JMA's introduction of "kokushobi" highlights growing concerns about extreme weather in Japan.

Confidence 0.85Sources 1Claims 5Entities 3
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Article analysis

Model · rule-based
Framing
Environmental
Public Health
Tone
Measured
AI-assessed
CalmNeutralAlarmist
Factuality
0.90 / 1.00
Factual
LowHigh
Sources cited
1
Limited
FewMany
§ 03

Key claims

5 extracted
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The description was introduced by Japan's Meteorological Agency (JMA) on Friday.

factualnull
Confidence
1.00
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The name emerged as the most popular in a national online survey.

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Confidence
1.00
03

The term kokushobi has been translated as "cruelly hot", "brutally hot" or "severely hot" day.

factualnull
Confidence
1.00
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Japan has unveiled a new name for days that reach 40C (104F) or above: kokushobi.

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Confidence
1.00
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Extreme weather events like heatwaves are becoming more common and more intense around the world.

factualnull
Confidence
0.90
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Full report

1 min read · 153 words
Japan has unveiled a new name for days that reach 40C (104F) or above, after the country experienced its hottest summer on record last year.The term - kokushobi - has been translated as "cruelly hot", "brutally hot" or "severely hot" day by Japanese and international media.The name emerged as the most popular in a national online survey, with "super extremely hot day" in second place.Extreme weather events like heatwaves are becoming more common and more intense around the world, fuelled by human activities such as the burning of fossil fuels.The description, introduced by Japan's Meteorological Agency (JMA) on Friday, uses koku - meaning harsh or cruel - to describe the heat, the Japan-times" class="entity-link entity-organization" data-entity-id="84046" data-entity-type="organization">Japan Times newspaper reported.The survey was conducted in February and March and received roughly 478,000 responses, in which people picked their preferred term among 13 options to describe the hottest day.Japan already has terms for days over 25C, 30C and 35C.
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Entities

3 identified
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Keywords & salience

8 terms
extreme heat
0.90
heatwave
0.80
japan
0.70
kokushobi
0.70
meteorological agency
0.60
extreme weather
0.50
climate change
0.50
temperature
0.40
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