Heatwaves in India: An Intensifying Climate Emergency

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Heatwaves have emerged as one of the most severe manifestations of climate change, particularly in tropical countries like India. Unlike sudden disasters, heatwaves are “silent killers” whose impacts accumulate gradually yet devastate human health, economies, and ecosystems.

According to the India Meteorological Department (IMD), a heatwave is declared when:

  • Maximum temperature ≥ 40°C in plains (≥30°C in hills), and
  • Departure from normal is 4.5°C to 6.4°C (heatwave) or ≥6.5°C (severe heatwave)
  • Alternatively, any temperature ≥45°C is classified as a heatwave irrespective of normal levels 

Globally, the World Meteorological Organization (WMO) defines heatwaves as prolonged periods of abnormally high temperatures, including both daytime and night-time temperatures, the latter being crucial for human recovery.

Spatial & Temporal Occurrence in India


Heatwaves in India exhibit a distinct seasonal and regional pattern:
  • Time period: Primarily from March to June, peaking in May.
  • Most affected regions:
    • Northwest India: Rajasthan, Punjab, Haryana, Delhi
    • Central India: Madhya Pradesh, Vidarbha
    • Eastern India: Bihar, Jharkhand, Odisha
  • Emerging hotspots: Southern states and even coastal regions due to humidity-induced “oppressive heat”.

Recent trends indicate expansion into traditionally cooler regions like Jammu & Kashmir, highlighting geographical spread.

Trend Over the Years


India has witnessed a sharp rise in heatwave frequency, intensity, and duration:
  • Three of the warmest years recorded in India occurred between 2015–2024.
  • Heatwave days are increasing and projected to rise significantly by 2030–2040.
  • Climate projections suggest heatwaves could occur 30 times more frequently under high warming scenarios.

This reflects a transition from episodic events → chronic climatic pattern.

Causes of Heatwaves

Natural Causes

  • Anticyclonic conditions: Trap hot air and suppress convection
  • Low soil moisture: Reduces evaporative cooling
  • Delayed western disturbances: Weakens cooling effects in North India
  • Atmospheric circulation changes: Rossby waves and jet stream shifts intensify heat

Anthropogenic Causes

  • Climate Change: Greenhouse gas emissions increase baseline temperatures
  • Urban Heat Island Effect: Concrete infrastructure traps heat
  • Deforestation: Loss of evapotranspiration cooling
  • Water depletion: Dry land heats faster
  • Air pollution: Alters radiation balance

Thus, heatwaves are no longer purely meteorological—they are climate-anthropogenic hybrids

Adverse Impacts

1. Human Health Crisis

  • India accounts for over 20% of global heatwave deaths in the last 30 year.
  • Heat stress leads to dehydration, heatstroke, cardiovascular failure.

2. Economic Losses

  • Up to 4.5% of GDP at risk due to lost labour productivity.
  • India may face 34 million job losses by 2030 due to heat stress.

3. Agriculture & Food Security

  • Crop yields decline due to heat stress and evapotranspiration.
  • Livestock productivity drops.

4. Energy & Water Stress

  • Surge in electricity demand → grid failures.
  • Increased evaporation worsens water scarcity.

5. Underreported Mortality

  • Heatwave deaths are often underestimated due to misclassification.

Precautionary Measures

Indoor

  • Stay hydrated; consume ORS, Buttermilk, Yogurt & Lemon Juice.
  • Keep rooms ventilated and doors open.
  • Avoid alcohol/caffeine.
  • Use AC only in necessary rooms setting the tempt at 24-25℃.
  • Keep gas cylinder away from sunlight.
  • Rest at least 30min every 2-3 hours.

Outdoor

  • Avoid exposure between 11 AM – 3 PM.
  • Wear light cotton clothing, hats.
  • Take frequent breaks in shade.
  • Reduce mobile usage: mobile explosion risk due to high heat.

Travel

  • Carry water and electrolytes.
  • Avoid overcrowded and poorly ventilated transport.
  • Avoid car travel between 11AM-3PM.
  • Do not completely fill fuel tank.
  • Refuel car in evening only.
  • Do not overfill tyres during travel.
  • After parking, leave car windows slightly open for ventilation.
  • Never leave children/elderly in parked vehicles.

Government of India’s Response

Key Initiatives

  • Heat Action Plans (HAPs) (pioneered in Ahmedabad)
  • Early Warning Systems by IMD
  • National Disaster Management Authority (NDMA) guidelines (2016)
  • Public awareness campaigns

Positive Outcomes

  • Reduction in mortality in cities like Ahmedabad due to HAPs
  • Improved forecasting and preparedness
  • Institutional recognition of heatwaves as disasters

Issues & Gaps

  • Poor implementation in rural areas
  • Lack of real-time local data
  • Underreporting of deaths
  • Fragmented institutional coordination
  • Limited integration with urban planning

Best Practices (Regional Examples)

  • Ahmedabad Heat Action Plan: Early warning + community outreach → significant mortality reduction
  • Odisha Model: School closures, changed work hours, awareness drives
  • Telangana “Cool Roof” Program: Reduces indoor temperatures
  • Kerala’s decentralized alerts: Integration with disaster management systems

These highlight the importance of localized, adaptive governance.

Way Forward

1. Policy Measures

  • Recognize heatwaves as a national disaster category
  • Develop a National Heat Risk Atlas
  • Integrate heat resilience into urban planning (Smart Cities Mission)

2. Technological & Infrastructure Solutions

  • Cool roofs, reflective materials
  • Urban greening and water bodies
  • Climate-resilient housing

3. Institutional Strengthening

  • Standardized Heat Action Plans across districts
  • Better data collection on mortality and morbidity
  • Inter-agency coordination (IMD, NDMA, Health Ministry)

4. Community-Level Adaptation

  • Behavioural awareness campaigns
  • Resilient livelihoods (flexible working hours)

5. Climate Mitigation

  • Transition to renewable energy
  • Sustainable land and water management

Heatwaves in India are no longer isolated weather anomalies but a systemic climate risk threatening public health, economic stability, and social equity. While policy responses have evolved, the scale of the challenge demands multi-level governance, scientific planning, and behavioural change.

As India moves toward becoming a global economic powerhouse, addressing heatwaves will be critical to ensuring that development remains inclusive, resilient, and sustainable.

References:

(Drishti IAS)

(Down To Earth)

(Business Standard)

(www.ndtv.com)

 


Location: India
Decode Nation presents simplified analysis of India’s key social, economic, political, environmental and governance issues for students, aspirants, curious citizens and policy makers.

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