Explainer: Heatwave in India - Reasons for increase in temperature day-by-day; Warning & More

Heatwave in India: This year summer is breaking all the old records. In the last two months, the maximum temperature of 40 degrees to 45 degrees Celsius.

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Heatwave in India: This year summer is breaking all the old records. In the last two months, the maximum temperature of 40 degrees to 45 degrees Celsius was recorded in western Rajasthan and Vidarbha in Maharashtra.

At the same time, if the meteorologists are to be believed, there is a possibility of temperatures up to 46 degrees Celsius in the capital of Delhi in the coming days. According to IMD, this time in March, the heat has broken the record of 122 years. 

March 2022 was the hottest summer since 1901. IMD says that the maximum temperature in March was 32.65 degrees Celsius as against the normal of 31.24 degrees. The surprising thing is that at the beginning of summer itself, four heatwaves have been seen. There is no hope of relief in the coming times as well.

What is Heatwave

Heatwave is a meteorological technical language that defines the hottest days. India Meteorological Department (IMD) announces heatwave. When the maximum temperature reaches 40 °C in the plains, 37 °C in the coastal areas, and at least 30 °C in the hilly areas. 

According to meteorologists, a heatwave is declared when the maximum temperature rises between 4.5 °C and 6.4 °C above normal. At the same time, when the maximum temperature rises more than 6.4 degrees Celsius above normal, then a heatwave is declared.

A heatwave can last between 4 to 10 days and sometimes longer. 
The heatwave period in May is longer than in April and June. Mainly lack of rain is also a reason.

Why so hot in this month?

There are many reasons why March and April are so hot this year. Premature onset of summer, prolonged heatwave, absence of rain from time to time. After March, many areas of the country have been deprived of normal light-intensity rain, hailstorm and lightning. 

According to the Meteorological Department, about 72 per cent reduction in rainfall was recorded in India. At the same time, in the North-Western regions of the country, this decrease had increased to 89 per cent. Take a look at the last few decades, the maximum temperature in India is increasing during the summer. 

Every 10 years there has been a huge increase in the number of heatwaves. According to the data, it was 413 between 1981-and 90. Whereas between 2001-2010 it increased to 575. At the same time, between 2011-and 2020, the number of heatwaves increased to 600.

The Director-General of the Indian Meteorological Department, Mrityajay Mohapatra, told during an interview that from a historical point of view, the heatwave has come even earlier in March. But this time its duration was longer and it continued for almost two weeks. In this way, its frequency also increased.

Climate change is also the main reason for the increase in maximum temperature. Dr DS Pai, director of the Institute for Climate Change Studies, Kottayam, says that one of the reasons for the increase in maximum temperature from normal depends on the local weather conditions. Apart from this, this is also due to the use of more concrete, and more cutting of trees.

Global warming is not the only cause of high temperatures. Our way of living also depends a lot on it. Affects the density, frequency and duration of the heatwave caused by global warming.

There will be no relief in the coming days

According to meteorologists, the days and duration of heatwaves will increase in the coming time as well. Where we are seeing higher temperatures during the day. At the same time, the weather will be hot at night as well.

The chances of reducing the heat do not seem to be decreasing yet. If reports are to be believed, Rajasthan, Delhi, Haryana, Chandigarh, Madhya Pradesh, Vidarbha, Uttar Pradesh, Jharkhand, West Bengal and Odisha should be prepared for hot days at least till May 1. By May 1, the maximum temperature is likely to rise by 2 degrees Celsius before a slight drop.

However, the heatwave in Bihar and Chhattisgarh will subside after April 30. On the other hand, in some parts of Telangana and Andhra Pradesh, the temperature may increase in the first week of May.