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IMD Considers Revising Heatwave Criteria as Warm Nights Rise 2-8 Days/Decade, Projected 10-13 Days/Decade

Target:UPSC GS-IIIMPSCTeachingSSC GAPrelims HighMains HighStatic GK Link
26 May 2026
~2 min
Source: Indian Express
Key Data:2-8 days/decade10-13 days/decadeSevenfold increase8.29 hours7.76 hours32°-35.5°C
Bodies:India Meteorological Department (IMD)Ministry of Statistics and Programme Implementation (MoSPI)JNU
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What This Article Covers

1.Heatwave patterns are evolving from daytime-only to include nighttime-only and compound events, challenging traditional definitions and warnings.

2.Warm nights increased by 2-8 days per decade and are projected to rise by 10-13 days/decade, linked to higher mortality risks independent of daytime heat.

3.The India Meteorological Department is considering revising heatwave criteria for coastal regions, highlighting the need for policies addressing indoor heat and housing vulnerability.

The Big Picture
Prelims · HighMains · High

Heatwaves are no longer just daytime events. The India Meteorological Department is considering revising heatwave criteria as nighttime and compound heatwaves increase, posing severe health risks like mortality from cardiovascular conditions and sleep deprivation. This shift requires new adaptation strategies, especially for vulnerable urban housing.

Exam Lens

Quick Exam Facts From News

Warm Nights Increase2-8 days/decade (historical)
Projected Increase (2015-2100)10-13 days/decade
Future Scenario Rise (2080-2100)Sevenfold increase in warm nights
National Time Use Survey (2024) - Sleep (Rural Men)8.29 hours
National Time Use Survey (2024) - Sleep (Urban Women)7.76 hours
Indoor Temp in Chennai32°-35.5°C

1-Minute Revision

  • ›Warm Nights Increase: 2-8 days/decade (historical)
  • ›Projected Increase (2015-2100): 10-13 days/decade
  • ›Target this Data: Warm nights increased by 2-8 days/decade, projected 10-13 days/decade (2015-2100).
  • ›Target this Nodal Body: India Meteorological Department (IMD) considering revised heatwave criteria.
  • ›Target this Legal Point: National Time Use Survey 2024 conducted by the Ministry of Statistics and Programme Implementation.

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Q1Static LinkageEasy

Which ministry conducts the National Time Use Survey mentioned in the article?

Q2Statement-basedHard

Consider the following statements regarding heatwaves as per the article:

1. Heatwave warnings in India are traditionally based only on maximum daytime temperatures.

2. Warm nights in India have decreased by 2-8 days per decade historically.

3. The India Meteorological Department is considering revising heatwave criteria for coastal regions.

Which of the statements given above is/are correct?

Q3Data-centricMedium

According to the National Time Use Survey 2024 cited in the article, how many hours of essential sleep do employed urban women (ages 15-59) get on average?

Q4Application/ImpactMedium

What is a key health implication of 'hot night excess' or high nighttime temperatures as discussed in the article?

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