The national capital’s fourth “heat wave day” of this month on Thursday saw the mercury soaring to 41.8 degrees Celsius, five notches above the normal, according to the weather department. The city had reeled under heat wave on July 1 (43.1 degrees Celsius), July 2 (41.3 degrees Celsius) and July 7 (42.6 degrees Celsius) also.
For the plains, a heat wave is declared when the maximum temperature is more than 40 degrees Celsius and at least 4.5 notches above the normal. The minimum temperature at the Safdarjung Observatory, which provides representative data for Delhi, settled at 30.6 degrees Celsius. The relative humidity was recorded at 40 per cent.
The India Meteorological Department predicted thunderstorm with light to moderate rain accompanied with winds of speed 20-40 kmph in and around South Delhi, Haryana’s Gohana and Rohtak, Uttar Pradesh’s Rampur, Chandausi, Sahaswan, and Rajasthan’s Nagar later in the evening. It has also forecast thunderstorm with rain on Friday and the maximum and minimum temperatures hovering around 40 degrees Celsius and 29 degrees Celsius respectively.
Data from the Central Pollution Control Board showed that the hourly air quality index (AQI) at 6.05 pm stood at 166. An AQI between zero and 50 is considered ‘good’, 51 and 100 ‘satisfactory’, 101 and 200 ‘moderate’, 201 and 300 ‘poor’, 301 and 400 ‘very poor’, and 401 and 500 ‘severe’.
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