IMD issues heatwave advisories as temperatures soar
Hot and humid conditions are expected over coastal and eastern regions, while warm night conditions are likely in parts of north India
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Context
On April 25, 2026, the issued comprehensive heatwave guidelines as temperatures soared across multiple Indian states. The advisory emphasizes mandatory hydration, avoiding peak afternoon sun exposure, and protecting vulnerable demographics to prevent severe health events like heat exhaustion and heatstroke.
UPSC Perspectives
Geographical
For UPSC aspirants, understanding the precise meteorological definition of a heatwave is crucial. The declares a heatwave based on strict temperature thresholds: the maximum temperature must reach at least 40°C in plains, 37°C in coastal areas, or 30°C in hilly regions. Once this baseline is met, the departure from the normal temperature must be between 4.5°C and 6.4°C for a standard heatwave, and greater than 6.4°C for a severe heatwave. Alternatively, an absolute maximum temperature of 45°C triggers a heatwave declaration regardless of the normal baseline. The agency relies on a color-coded alert system (Green, Yellow, Orange, Red) to communicate the severity of the hazard to state administrations and the public.
Governance
The management of extreme heat requires a robust institutional response, primarily guided by the . At the local level, cities and states implement which outline standard operating procedures like rescheduling outdoor work, setting up cooling centers, and ensuring public water availability. However, a major governance challenge remains: heatwaves are currently not a notified natural disaster under the . Because of this exclusion, states cannot easily utilize the or the State Disaster Response Fund to finance structural mitigation or provide compensation for heat-related deaths, leaving local responses severely underfunded.
Environmental
The increasing frequency, intensity, and early onset of heatwaves in India are direct manifestations of global climate change, as repeatedly warned by the . In major metropolitan areas, this baseline warming is exacerbated by the effect, where concrete, asphalt, and a lack of green cover trap heat, resulting in significantly higher nighttime temperatures that prevent the human body from cooling down. This phenomenon disproportionately impacts the urban poor and informal outdoor workforce, such as construction laborers and gig workers. Addressing this requires transitioning from purely reactive advisories to long-term structural adaptations, including cool roof policies, urban afforestation, and climate-resilient city planning.