According to meteorology officials, Delhi is likely to experience a heatwave between April 16 and May 31, with temperatures reaching up to 40 degrees Celsius. The city’s primary weather station, Safdarjung, recorded 13 heatwave days between March and May 2022, which is the highest number in the past 11 years. In preparation for the heatwave, the Delhi government has issued guidelines for schools to ensure the well-being of students during the ongoing summer season. Schools must avoid student assemblies during the afternoon shift, provide drinking water and give water breaks during classes. Meanwhile, Mumbai experienced thunderstorms and lightning accompanied by rainfall in certain areas on Wednesday night, which brought down the sweltering heat in the coastal city.
Mumbai experienced a sudden spell of rainfall accompanied by thunderstorms and lightning on Wednesday night. The temperature dropped in the city and suburban regions due to the showers.
The India Meteorological Department (IMD) defines a heatwave as a period of abnormally hot weather that lasts for at least two days and is characterized by temperatures that are significantly higher than the average maximum temperature for a particular region during that season. The classification of heatwave varies depending on the region, but the criteria you mentioned are the general guidelines for the classification of a heatwave day.