The India Meteorological Department (IMD) has recently launched the Heat Index on experimental basis. 

• The experimental Heat Index has been launched by IMD to provide general guidance for the regions within India where, the apparent temperature/feel like temperature (considering the impact of humidity along with the temperature) are on the higher side causing discomfort for 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.
• The 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.
• It provides guidance towards additional care to be taken by people to reduce discomfort.
• Shri Rijiju said colour codes used for Experimental Heat Index are as follows:
• 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