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India's metropolitan cities, particularly those in the north and central regions, have been experiencing an unprecedented heatwave with temperatures soaring to over 50 degrees Celsius in some areas.
This phenomenon, attributed to the urban heat-island effect and exacerbated by the El Nino effect, has resulted in widespread discomfort and health concerns among the populace.
The urban heat-island effect, caused by the absorption and retention of heat by buildings and infrastructure in urban areas, makes cities significantly warmer than their rural surroundings.
El Nino, characterized by unusually warm ocean temperatures in the Pacific Ocean, has further contributed to the current heatwave by altering global weather patterns and leading to a rise in sea surface temperatures.
The excessive heat has also increased the risk of heat stress, a dangerous condition that occurs when the body is unable to cool itself down adequately through sweating.
There are two types of heat stress: dry heat stress, which occurs when temperatures rise but humidity remains low, and moist heat stress, which occurs when humidity is combined with rising temperatures.
In India, central and northwestern regions are more prone to dry heat stress, while eastern coastal areas experience humid heat stress during the monsoon season.
A recent study by the India Meteorological Department (IMD) revealed a 30% increase in heat stress cases in India over the past 40 years due to the combination of rising temperatures and humidity.
The average heat index in central India, northwest India, and eastern coastal areas has risen by 4 to 5 degrees Celsius above their normal summer temperatures during this period.
It is important to note that the current heatwave is not limited to India but is part of a global trend of rising temperatures, highlighting the urgent need for measures to address climate change and mitigate its impacts.
Source: Why Temperatures In Indian Cities Are Rising Like Never Before