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Heatwave Disaster Management in India | UPSC GS-3 Notes

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Heatwave Disaster Management in India

A heat wave is a period of abnormally high temperature that is more than the normal maximum temperature of a region.

It is a slow-onset but high-impact disaster, especially in densely populated, urban, dry and vulnerable regions. Heat waves can cause heat exhaustion, heat stroke, dehydration, deaths, crop losses, water stress, power demand surge and livelihood disruption.

In India, heat waves are common during the pre-monsoon months, especially from March to June, and sometimes continue till July depending on monsoon onset.

Recurrent heat waves, already a concern in rapidly growing and urbanizing India, will very likely to further worsen in a warming world.

Criterion for Declaring Heat Wave in India

  • Heat wave declaration is considered if the maximum temperature of a station reaches 
    • at least 40°C or more for Plains
    • 37°C or more for coastal stations
    • at least 30°C or more for Hilly regions. 
  • Categorisation of Heatwaves
    • Based on Departure from Normal 
      • Heat Wave: If Departure from normal is 4.5°C to 6.4°C
      • Severe Heat Wave: Departure from normal is >6.4°C
    • Based on Actual Maximum Temperature 
      • Heat Wave: When actual maximum temperature ≥ 45°C 
      • Severe Heat Wave: When actual maximum temperature ≥47°C

Heat wave and Disaster Management

  • “Disaster” is defined under section 2(d) of the Disaster Management Act, 2005 as a catastrophe, mishap, calamity or grave occurrence in any area, arising from natural or man-made causes, and is of such a nature or magnitude as to be beyond the coping capacity of the affected area. 
  • Heat wave has not been notified as a disaster by the Government of India yet. It is not in the list of twelve disasters eligible for relief under National/ State Disaster Response Fund norms. 
  • However, a State Government may use up to 10 per cent of the funds available under the SDRF for providing immediate relief to the victims of natural disasters that they consider to be disasters “within the local context in the State and which are not included in the notified list of disasters of the Ministry of Home Affairs subject to the condition that the State Government has listed the State specific natural disasters and notified clear and transparent norms and guidelines for such disasters with the approval of the State Authority.”

Causes of Heatwaves

Heatwaves are caused by a combination of natural atmospheric conditions and human-induced factors. Natural factors create high-temperature conditions, while anthropogenic factors intensify their frequency, duration and impact.

  • Delayed Monsoon
    • If monsoon arrival is delayed, summer heat continues for a longer period.
    • This increases the duration of heatwave conditions, especially in north, central and eastern India.
  • El Nino Conditions
    • El Nino can weaken monsoon circulation and increase temperature in parts of India.
    • It may contribute to rainfall deficiency and hotter-than-normal conditions.
  • High Pressure System
    • Heatwaves often develop when a high-pressure system becomes stationary over a region.
    • This system pushes air downward, prevents cloud formation and traps heat near the surface.
    • As a result, the land gets continuously heated for several days.
  • Climate Change
    • Human-induced climate change is increasing average global temperatures.
    • A warmer baseline makes heatwaves more frequent, intense and longer-lasting.
    • Even small increases in average temperature can sharply increase extreme heat events.
  • Urban Heat Island Effect
    • Cities are warmer than nearby rural areas due to concrete buildings, asphalt roads, vehicles, industries, air conditioners and reduced vegetation.
    • Concrete and asphalt absorb heat during the day and release it slowly at night.
    • This increases both daytime and night-time heat stress.
  • Clear Sky and Strong Solar Radiation
    • When skies remain clear, direct solar radiation reaches the surface without obstruction.
    • This increases land surface temperature and raises daytime heat.
  • Deforestation and Loss of Green Cover
    • Trees provide shade and cooling through evapotranspiration.
    • Deforestation and loss of vegetation reduce natural cooling.
    • This increases local temperature and worsens heatwave impact.
  • Dry Soil and Low Soil Moisture
    • Dry soil heats faster than moist soil.
    • When soil moisture is low, less energy is used for evaporation and more energy heats the surface.
    • This intensifies local heat.

Impacts of Heat Waves

  • Human Health Impact
    • Heat waves can cause dehydration, heat cramps, heat exhaustion, heat stroke, fainting, headache, fatigue and death.
    • People with heart disease, respiratory illness, kidney problems and diabetes are at greater risk.
    • High night-time temperatures are also dangerous because the body does not get enough time to cool down.
  • Impact on Workers and Livelihoods
    • Outdoor workers face reduced productivity, fatigue, dehydration and income loss.
    • Construction workers, agricultural labourers, street vendors, delivery workers and transport workers are highly exposed.
    • Heat waves can reduce work hours and increase occupational health risks.
    • Heat exposure has led to the loss of 247 billion potential labour hours in 2024, marking a record high and a 124 per cent increase compared to 1990-1999 levels, according to the 2025 edition of the Lancet Countdown on Health and Climate Change. 
  • Impact on Agriculture
    • Heat stress affects crop growth, flowering, grain formation and yield.
    • High temperatures can damage wheat, pulses, vegetables, fruits and other crops.
    • It also increases irrigation demand and soil moisture loss.
  • Impact on Livestock
    • Heat waves reduce milk yield, fertility and animal health.
    • Animals may suffer from dehydration, heat stress and shortage of fodder and drinking water.
  • Water Stress
    • Heat waves increase demand for drinking water, irrigation and cooling.
    • At the same time, evaporation increases, reducing water availability in tanks, ponds, reservoirs and soil.
  • Energy Demand
    • Use of fans, coolers and air conditioners increases sharply during heat waves.
    • This creates pressure on electricity supply and may lead to power outages.
      • Power grid stress — AC demand spikes → blackouts → worsens heat crisis
    • Power cuts during heat waves further increase health risks.
  • Urban Impact
    • Cities face higher heat stress due to the urban heat island effect.
    • Slums, crowded settlements, tin-roof houses, poorly ventilated rooms and concrete-dense areas become extremely unsafe.
  • Environmental Impact
    • Heat waves may dry wetlands, reduce soil moisture, increase forest fire risk, affect biodiversity and disturb ecosystems.
    • Animals and birds may suffer from dehydration and heat stress
      • Heat waves also cause the death of wildlife, birds, poultry, etc. across the country.
    • They can also worsen air pollution and ground-level ozone formation.
  • Social Impact
    • Heat waves disrupt school schedules, working hours, public transport, outdoor activities and daily life.
    • Poor households suffer more because they have limited access to cooling, safe housing, healthcare and water.

Disaster Risk Reduction Measures

  • Heat Action Plans
    • Heat Action Plans are one of the most important measures for heat wave management.
    • They include early warning, public awareness, health system preparedness, inter-departmental coordination, water supply measures, cooling centres, work-hour advisories and protection of vulnerable groups.
  • Early Warning System
    • Heat wave alerts should be issued in advance based on temperature forecasts, humidity, night-time temperature and local risk.
    • Warnings must be simple, local-language based and shared through SMS, radio, television, mobile apps, social media, local bodies, schools, health workers and community volunteers.
  • Public Awareness
    • People should be informed about heat symptoms, hydration, safe behaviour, avoiding direct sun, using ORS, wearing light clothing and seeking medical help.
    • Awareness should especially target outdoor workers, elderly persons, slum dwellers and school children.
  • Health System Preparedness
    • Hospitals and primary health centres should be ready to treat heat-related illnesses.
    • Preparedness includes emergency beds, ORS, IV fluids, cooling arrangements, trained staff, ambulance readiness, heat stroke treatment protocols and surveillance of heat-related deaths.
  • Drinking Water Availability
    • Safe drinking water should be made available in public places, bus stands, railway stations, markets, schools, worksites and vulnerable settlements.
    • Water kiosks, mobile water supply, tankers and repair of hand pumps should be ensured during peak heat periods.
  • Work-Hour Regulation
    • Outdoor work should be avoided during peak heat hours.
    • Construction work, street vending and other outdoor activities should be shifted to early morning or evening where possible.
    • Employers should provide shade, water, rest breaks and first aid.
  • School Safety
    • Schools should avoid outdoor activities during heat wave periods.
    • Timings may be adjusted, and children should have access to drinking water, shaded areas and basic health support.
  • Cooling Centres and Shelters
    • Cities should provide cooling shelters in public buildings, community halls, schools and shaded spaces.
    • These are important for homeless persons, elderly people, slum dwellers and those without access to cooling.
  • Urban Green Cover
    • Trees, parks, urban forests, green belts and shaded streets reduce heat stress.
    • Urban planning should increase green spaces and protect existing trees.
  • Cool Roofs and Climate-Sensitive Housing
    • Cool roofs reflect sunlight and reduce indoor temperatures.
    • White roofs, reflective paint, insulated roofs, ventilated houses and low-cost cooling materials can help poor households reduce heat stress.
  • Water Bodies and Blue-Green Infrastructure
    • Lakes, ponds, wetlands, canals, green corridors and open spaces help reduce urban heat.
    • Restoration of water bodies and urban ecology should be part of heat resilience.
  • Community-Based Preparedness
    • Local volunteers, ASHA workers, anganwadi workers, RWAs, NGOs and panchayats can help identify vulnerable persons, spread warnings, support hydration and assist during emergencies.
  • Protection of Vulnerable Groups
    • Authorities should identify and support elderly persons living alone, homeless people, persons with disabilities, pregnant women, chronically ill persons, slum dwellers and outdoor workers.
    • Support may include home visits, water supply, health checks, cooling shelters and emergency transport.
  • Livestock Protection
    • Animals should be provided shade, water, ventilation and veterinary support.
    • Grazing and transport of animals should be avoided during peak heat hours.
  • Agriculture Advisory
    • Farmers should receive advisories on irrigation scheduling, mulching, heat-tolerant varieties, crop protection, livestock care and soil moisture conservation.
  • Power Supply Preparedness
    • Electricity departments should prepare for peak demand.
    • Hospitals, water supply systems and cooling centres should have backup power arrangements.

Challenges in Heat Wave Management in India

  • Underestimation of Heat Waves & its impact
    • Heat deaths massively undercounted — only direct heat stroke recorded; indirect deaths (cardiac, renal failure) attributed to other causes
    • Heat waves are often not perceived as dramatic disasters like floods or cyclones.
    • This leads to low public preparedness and delayed response.
  • Poor Vulnerability Mapping
    • Many cities and districts do not have detailed mapping of vulnerable people, high-risk neighbourhoods, outdoor workers, homeless persons and heat-prone zones.
  • HAP implementation
    • HAPs adopted by 250+ cities but implementation quality highly uneven — many plans are copy-paste with no local adaptation
    • They remain “largely guiding documents on paper.” 
      • Most plans still fail to adequately address the realities faced by outdoor workers, home-based workers, communities living in informal settlements, women, elderly people, and children 
  • Urban Heat Island Effect
    • Urban Heat Island data gaps — most cities lack dense sensor networks to map intra-city temperature variation
    • Rapid urbanisation, concretisation, loss of trees and poor ventilation increase heat stress in cities.
  • Limited Access to Cooling
    • Cooling centres exist on paper — often inaccessible, unstaffed, or unknown to vulnerable communities
    • Poor households, slum dwellers, homeless persons and outdoor workers often lack access to fans, coolers, shaded spaces and safe housing.
  • Occupational Exposure
    • A large workforce works outdoors in agriculture, construction, transport, street vending and delivery services.
    • Heat safety norms are often weakly enforced.
    • Labour law enforcement weak — construction workers, brick kiln workers work through Red alert periods without protection
  • Water Scarcity
    • Heat waves increase drinking water demand, but many areas already face water shortages.
  • Weak Health Preparedness
    • Not all health facilities are adequately prepared for heat-related illnesses.
    • Training, surveillance and emergency protocols need strengthening.
  • Climate Change
    • Rising temperatures are making heat waves more frequent, intense and prolonged.
    • Past preparedness levels may not be enough for future heat risks.
  • Public Awareness 
    • Wet-bulb temperature not in public communication — most people don’t understand humidity-heat interaction
    • Night-time heat ignored — body recovers from daytime heat during cool nights; when nights are hot, cumulative stress kills

Way Forward

  • Strengthen and localise Heat Action Plans.
    • Mandate Heat Action Plans for all 734 districts — not just cities; rural areas equally at risk
  • Improve heat wave forecasting and last-mile warning.
  • Map vulnerable populations and heat-prone urban zones.
  • National Heat Mortality Surveillance System — standardised, real-time, cause-of-death tracking during heatwaves
  • Expand cool roof programmes in low-income settlements.
    • Scale cool roofs programme nationally — subsidise white reflective coating for BPL households
  • Urban planning reform — mandatory urban tree canopy cover targets (minimum 20%) in all city master plans
  • Restore urban water bodies — every city to restore at least one water body per ward as cooling zone
  • Green building code enforcement — passive cooling design (cross-ventilation, shading, thermal mass) mandated
  • Amend labour laws — mandatory heat breaks, shade, water for outdoor workers; enforceable, not advisory
  • Provide drinking water points and cooling shelters in public areas.
  • Regulate outdoor work during peak heat hours.
  • Train health workers to identify and treat heat-related illnesses.
  • Strengthen heat-health surveillance and data collection.
  • Integrate heat risk into urban planning, housing and labour policies.
  • Promote climate-resilient agriculture and livestock care.
  • Ensure backup power for hospitals, water supply and emergency centres.
  • Build public awareness before and during summer months.
    • Include wet-bulb temperature and night temperature in public heatwave warnings

Heat waves are becoming a major disaster risk in India due to climate change, urban heat islands, water stress and high exposure of outdoor workers and vulnerable populations. Since heat waves develop gradually, their impact can be significantly reduced through early warning, Heat Action Plans, public awareness, health preparedness, drinking water access, work-hour regulation, cool roofs, urban greening and protection of vulnerable groups. India’s heat wave management must shift from temporary advisories to long-term heat resilience planning.

Sample Mains Questions

Q1. Heatwaves are slow-onset disasters but have high social and economic impacts. Analyse.
(250 words, 15 marks)

Q2. Examine the role of Heat Action Plans in reducing heatwave-related deaths and vulnerability.
(150 words, 10 marks)

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