- SFG FRC 2027 | Program starts from 18th Dec. 2026 | Admissions open for Entrance Test Click Here to know more →
- Prelims Test Series (PTS) for Prelims 2027 starts 11th Oct. 2026 Click Here to know more →
- [Pre-order] Ethics Redbook 3rd Edition: Delivery starts from 10th October onwards Click Here to Read More →
- 21 Sept. | GS Advance Program (GSAP) for UPSC 2027 Mains starts from 11th Oct. Click Here to Read More →
Source: The post is based on the article “IMD has launched Heat Index” published in PIB on 20th July 2023.
What is the News?
India Meteorological Department (IMD) has launched the Heat Index on an experimental basis.
What is the Heat Index?
Source: TOI
Heat Index is also known as the apparent temperature. It is the temperature humans feel when relative humidity combines with the air temperature.
For instance, you may experience unusually high levels of heat despite the official temperature forecast indicating a ‘normal’ range. Say, if the absolute humidity of an area is high, you may feel hot, even though the temperature may not necessarily be that high.
Similarly, say there is a wind blowing; you will automatically feel colder, even if the temperature may not be so low.
How will the Heat Index be calculated by IMD?
At present, heat index is derived using the heat index equation similar to what is used by National Weather Service, National Oceanic and Atmospheric Administration (NOAA), USA.
What are the colour codes used for Heat Index?
The colour codes used for Experimental Heat Index are as follows: 1) Green: Experimental heat Index less than 35 deg C 2) Yellow: Experimental heat Index in the range 36-45 deg C 3) Orange: Experimental heat Index in the range 46-55 deg C and 4) Red: Experimental heat Index greater than 55 deg C.
