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Indian Meteorological Department (IMD) issued Heatwave alert


Why is it in the news?

  • The Indian Meteorological Department (IMD) issued a heatwave alert predicting above normal heatwave conditions over most parts of south peninsula, central India, east India, and plains of northwest India during the April to June hot weather season.
About Heat waves

·       Heatwave is declared when temperatures cross 40°C in plains, 37°C in coastal areas, and 30°C in hills, with specific criteria for departure from normal temperature ranging from 4.5°C to 6.4°C, and actual maximum temperature criteria ranging from ≥ 45°C for heatwave and ≥47°C for severe heatwave.

·       Favourable conditions for heatwaves: Transportation of hot dry air, absence of moisture in the upper atmosphere, cloudless skies, and large amplitude anti-cyclonic flow over the area.

·       Impacts of heatwaves: Health hazards such as heat stroke, increased strain on water and energy sources, and food insecurity due to crop wilting, stunting, or early ripening.

Key initiatives

·       IMD issues color-coded impact-based heat warnings jointly with the National Disaster Management Authority (NDMA), including Green (No action), Yellow (Be updated), Orange (Be prepared), and Red (Take Action) alerts.

·       NDMA’s guidelines include the preparation of action plans for the prevention and management of heatwaves, and states prepare Heat Wave Action Plans accordingly.

·       The National Action Plan on Heat Related Illnesses aims at effective preparedness of health facilities to address heat impacts and manage cases.

 

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