Discuss why night-time warming poses a greater governance challenge than daytime heat in India's disaster management framework.

Q. Discuss why night-time warming poses a greater governance challenge than daytime heat in India's disaster management framework. (15 marks, 250-350 words)

A heatwave in India is declared on daytime maximum temperature, yet IMD's Core Heatwave Zone study (1961–2020) shows minimum temperatures rising at about 0.21°C per decade — faster than daytime warming [1]. This mismatch between the science and the statute is the heart of the governance problem.

The trend is real and measurable - Over the CHZ, heatwave frequency rose ~0.1 day/decade and duration ~0.44 day/decade, both statistically significant [1]. - The Ministry of Earth Sciences has attributed this rising frequency and intensity of extreme heat to global warming [2].

A definitional blind spot in triggers - NDMA/IMD declaration criteria rest on departure of the maximum temperature from normal — 4–5°C or an absolute 45°C threshold [3]. A hot night, however severe, generates no alert, no colour code, no trigger. - Disaster response in India is trigger-driven; without a declaration, relief machinery, advisories and compensation norms do not activate.

Response machinery is daytime-calibrated - IMD's heatwave guidance centres on avoiding exposure between noon and 3 p.m. [4] — advice irrelevant to overnight heat stress. - Heat Action Plans, implemented by NDMA with 23 heatwave-prone States, largely schedule work-hour shifts, water points and shaded shelters for daylight hours [2].

Amplified and unequal human impact - Warm nights deny the body its recovery window, raising cardiovascular and heat-stroke mortality. - Urban heat islands keep built-up areas warmer after sunset, hitting informal settlements and outdoor workers who lack cooling and ventilation hardest.

Night-time warming is therefore not merely an additional hazard but a systemic gap: it is faster-growing, unmeasured by existing triggers, and unaddressed by existing responses. Incorporating minimum-temperature thresholds into heatwave criteria, extending Heat Action Plans to night shelters and cooling centres, and mapping urban heat islands would align India's disaster framework with its climate reality — advancing both SDG-11 (sustainable cities) and SDG-13 (climate action).

(~315 words)

Sources: 1. Chapter 4: Climatology and Long-Term Trends of Heat Waves, India Meteorological Department — Core Heatwave Zone 1961–2020 trends in heatwave frequency, duration and night-time warming rate 2. PIB / Ministry of Earth Sciences, Parliament Question: Rising Incidents of Extreme Heat — global warming attribution; Heat Action Plans implemented by NDMA with 23 States 3. NDMA, Heat Wave — Natural Hazards — heatwave declaration criteria based on maximum temperature departure and the 45°C threshold 4. PIB, IMD Issues Comprehensive Heatwave Guidance as Temperatures Rise Across Regions — daytime-focused public advisories and exposure-avoidance window