First-of-its-kind heat in­dex to help you be aware

Hindustan Times ST (Mumbai) - HT Navi Mumbai Live - - FRONT PAGE - Sne­hal Fer­nan­des sne­hal.fer­nan­[email protected]­dus­tan­

With sev­eral parts of the coun­try ex­pe­ri­enc­ing heat waves and the mer­cury slowly ris­ing even in Mum­bai, the weather de­part­ment has de­cided to come up with a first-of-its-kind heat in­dex, which will help cit­i­zens be up to date with the weather con­di­tion at a par­tic­u­lar lo­ca­tion.

The In­dia Me­te­o­ro­log­i­cal De­part­ment (IMD) will launch the heat in­dex this month and data will be avail­able on the bu­reau’s web­site, with up­dates ev­ery three hours from all weather sta­tions across In­dia.

The in­dex — a mea­sure of how hot it re­ally feels — will be cal­cu­lated based on ac­tual tem­per­a­tures and rel­a­tive hu­mid­ity lev­els.

“Many times, when the tem­per­a­tures are low, but hu­mid­ity is high, we feel hot­ter than what the tem­per­a­ture projects. We don’t feel as hot when the tem­per­a­tures are high and hu­mid­ity lev­els are low,” said BP Ya­dav, di­rec­tor gen­eral, me­te­o­rol­ogy, IMD Delhi. “The in­dex will give cit­i­zens ac­cu­rate and up­dated in­for­ma­tion on the heat con­di­tions spe­cific to their ar­eas.”

In ad­di­tion to in­tro­duc­ing ter­mi­nolo­gies, the in­dex will also com­prise a warn­ing colour code, ac­com­pa­nied by in­for­ma­tion on health haz­ards if the tem­per­a­ture and hu­mid­ity lev­els cross a par­tic­u­lar thresh­old.

For in­stance, a heat in­dex be­tween 40 and 54 with hu­mid­ity lev­els less than 70% and more than 70% is termed is ‘un­com­fort­able’ and ‘un­com­fort­able sul­try’, with yel­low and or­ange as warn­ing colour codes, re­spec­tively.


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