Heat index

July 22, 2023

IMD has recently launched Heat Index on an experimental basis to provide general guidance for the regions within in India, where apparent temperatures are on higher side causing discomfort to the people.
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.
Heat index provides information about the impact of humidity on the high temperatures and thus provides a feel like temperature for human beings which can be used as an indication for human discomfort.
Color codes for Heat Index:
- Green: – Experimental heat Index less than 35 deg C
- Yellow: – Experimental heat Index in the range 36-45 deg C
- Orange: – Experimental heat Index in the range 46-55 deg C
- Red: – Experimental heat Index greater than 55 deg C