The Tamil Nadu government has declared a heatwave as a State-specific disaster to provide relief and compensation for heat-related casualties. Interim actions will be taken to manage the heat, funded by the State Disaster Response Fund. A heat wave is defined as a period of abnormally high temperatures above the normal maximum. In India, heat waves usually occur from March to June and can extend into July. On average, five to six heat wave events happen annually in northern India. A heat wave is considered if temperatures reach 40°C or more in plains and 30°C or more in hilly areas. Severe heat waves are classified by greater temperature deviations or higher maximum temperatures.
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