Why You Are Feeling Hotter Than It Really Is

    • Agencies
    • Publish Date: Feb 26 2017 12:27PM
    • |
    • Updated Date: Feb 26 2017 12:27PM
Why You Are Feeling Hotter Than It Really Is

If you are feeling hotter than the thermometer reading shows, blame the rising heat index in India.

What Is Heat Index? 
Heat index is a measure of how hot it really feels when relative humidity is factored with the actual air temperature; the higher the heat index, the hotter one feels. Research by the India Meteorological Department and Indian Institute of Tropical Meteorology shows that the average heat index in India is increasing per decade at the rate of 0.56 degrees C and 0.32 degrees C in summer and monsoon respectively , reports Neha Madaan.

Of 25 mega cities analysed, 17, including Mumbai, Pune, Kolkata and Ahmedabad, have long-term average summer heat index in 'very hot category'. The study found that Mumbai and Pune from west India are in the `hot category' of the index in monsoon. Most mega cities in north India, including Delhi and Amritsar, are in hot category of the heat index during the summer season and in 'very hot category' in monsoon.

What Is Very Hot Category?

This category is considered dangerous, with health effects such as heat cramps, exhaustion and heatstroke with prolonged exposure or physical activity . The 'hot category' requires people exposed to it to take extreme caution. The study found that 10 mega cities show significant increasing trends in monsoon heat index, including Mumbai and New Delhi.

“Most mega cities have significant increasing trends in summer and monsoon season heat index. Mega cities are densely packed with people, buildings, industries and motor vehicles. Heat released in the atmosphere gets trapped, meaning the ambi ent temperature is often higher than the immediate surroundings,“ said former IMD official and lead researcher A K Jaswal.

He said an interesting regional phenomenon is the stilling of winds. “Wind helps sweat to evaporate and the body to cool,“ he said. The study used monthly average maximum temperature and relative humidity records to analyse heat index during summer and monsoon from 1951to 2010 (60 years).

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Comments

A.parmeshgoud sree narayana vidya bhavan

yes i feel Hotter Than It Really Is

Yashas M Salian ST MARY''S CONVENT & PUB SCH

Is there something called ''Cold Index''? Sometimes, Bengaluru feels colder than it really is.

Himanshi Dhawan Saffron Public School

Today, climate change has become the burning topic of the day. And the mankind is responsible for all these.

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