Facts for Prelims (FFP)
Source: TOI
Context: The mercury in Delhi reached 41°C recently, but with high humidity, the heat index soared to a blistering 50°C.
IMD now measures the heat index, factoring in both temperature and humidity, providing a more accurate sense of discomfort. Expectations are for the index to hit 54-56°C in the next 48 hours.
Launched by the India Meteorological Department (IMD) on an experimental basis. Also known as Apparent Temperature, it reflects what the temperature feels like to the human body when relative humidity is combined with the air temperature. It provides information about the impact of humidity on high temperatures and serves as an indicator of human discomfort.
Color codes used for HI:
- Green: HI less than 35°C
- Yellow: HI between 36-45°C
- Orange: HI between 46-55°C
- Red: HI greater than 55°C
