IMD Flags Heatwave Across Six States and Rain Over the Northeast on 19 April 2026

The India Meteorological Department (IMD) on 19 April 2026 said heatwave conditions were very likely over Uttar Pradesh, Rajasthan, Madhya Pradesh, Chhattisgarh, Odisha and Jharkhand. At the same time, Jammu and Kashmir, Ladakh and the Northeast — including Arunachal Pradesh, Assam and Meghalaya — were forecast to receive light to moderate rainfall or snow with thunderstorms and gusty winds.

A heatwave, as defined by the IMD over the plains, is declared when the maximum temperature touches at least 40°C and is 4.5°C to 6.4°C above the normal for that location. Over hills the threshold is 30°C, and over coastal areas 37°C. A 'severe' heatwave is declared when the departure from normal exceeds 6.4°C.

The 2026 pre-monsoon season is being closely watched. The IMD's seasonal outlook for April-June 2026 has projected above-normal heatwave days and warmer-than-usual nights across most of central, north and east India. Higher night temperatures are particularly dangerous because the human body relies on cooler nights to recover from daytime heat stress.

Heatwave events have direct economic and social costs — reduced labour productivity in construction and agriculture, higher peak power demand, water stress and excess mortality among the elderly, outdoor workers and slum residents. The National Disaster Management Authority (NDMA), in coordination with state disaster management authorities, runs Heat Action Plans (HAPs) in over 23 states; Ahmedabad's HAP is the country's oldest and most studied. Key measures include cool roofs, drinking-water kiosks, shifted work hours and early-warning SMS alerts.

Exam angle: Useful recall on the IMD heatwave thresholds (40°C plains, 30°C hills, 37°C coast; +4.5°C departure for heatwave), the role of NDMA and Heat Action Plans, and the climate-change link to warm nights. Strong fit for UPSC GS-1 (geography, climate), GS-3 (disaster management) and SSC/Banking GA.