The maximum temperature is likely to settle around 34 degrees Celsius, it said. The weathermen have predicted generally cloudy sky with very light rain and thundershowers accompanied with gusty winds for Saturday. Speaking of current temperatures, as per IMD, the national capital on Saturday recorded a minimum temperature of 22.2 degrees Celsius, two notches below normal. A severe heatwave is declared when the temperature is above 40 degrees Celsius and 6.5 degrees above normal. The weather office declares a heatwave when the maximum temperature crosses 40 degrees Celsius and is 4.5 degrees above normal for the day. The heat index will be issued for the entire country every day in weather bulletins. Ravichandran said the index will be issued to make such data more accessible to the public for precautionary measures. The heat index issued by the IMD on Friday carried a disclaimer stating "not validated for India", making it clear that it was an experimental forecast to educate people about the implications of heat on them. For example, in India, 40 degrees Celsius temperature and 20 per cent relative humidity could be okay, but the same is intolerable for a person residing in the US." However, the heat index is yet to be validated for Indian conditions and uses the comfort levels of weather experienced by Americans in their regions.įurther explaining, M Ravichandran, Secretary, Ministry of Earth Sciences said, “We have to work with the health ministry to validate the observations for Indian cities. Currently, the weather office uses a formula of the National Oceanic and Atmospheric Administration (NOAA) to calculate the heat index.
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