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→ What are heatwaves?

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Answer 1

Answer:

A heat wave is generally defined as a period of several days to weeks of abnormally hot weather. In the past 3-4 decades, there has been an increasing trend in high-humidity heat waves, which are characterized by the persistence of extremely high night-time temperature.

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Answer 2

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⛄ A heatwave is a period of prolonged abnormally high surface temperatures relative to those normally expected. Classifying a heatwave varies from country to country. The World Meteorological Organization (WMO) defines heatwaves as five or more consecutive days during which the daily maximum temperature surpasses the average maximum temperature by 5°C or more.

Heatwaves are generally the result of trapped air. A heatwave is formed when a system of high atmospheric pressure moves into an area. The high-pressure system pulls air from the upper levels of the atmosphere towards the ground. The air is trapped and prevented from rising, thus increasing the atmospheric temperature. The longer the system stays in an area, the hotter it gets. The high pressure also prevents winds and clouds, allowing the sun to beat down without respite. The combination of these factors creates exceptionally hot temperatures, which we call a heatwave.

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⛄ The unusually extreme heatwave in Japan and many parts of the northern hemisphere in 2018, in which more than 1,000 people died, has been attributed to climatic change. In July 2019, some parts or Europe recorded a maximum temperature of 46.1°C, unusual for this part of the world.

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