The Indian Metereological department has issued a red alert notice for heat wave conditions over Northwest, central and adjoining peninsular India over the next five days.
Gangananager, Bikaner, Badmer, Jaisalmer, Hanumangarh, Bhatinda, Hisar, Fatehabad, Bhiwani, Rohtak, Jhajjar, Gurgaon, Palwal, Faridabad, Gautam Buddh Nagar (Noida), Alwar, Bharatput, Karoli, Tonk and Birbhum, among many others have been listed under the red alert.
Intense rainfall activity over Northeast India during 25th– 27th May, 2020.
Dry northwesterly winds are prevailing over Northwest and Central India since last two days and it is likely to continue to prevail during next 4-5 days. Under its influence, heat waves to severe heat wave conditions are likely to prevail over plains of northwest India and adjoining Central India.
Rainfall activity has significantly reduced over south Peninsular India, giving rise to development of heat wave conditions over parts of that region also.
Under the influence of converging strong southwesterly winds from the Bay of Bengal,Northeast India is likely to experience heavy to very heavy rainfall with extremely heavy falls during 25th– 27th May, 2020.
Parts of Northeast India had been experiencing heavy to very heavy rainfall with isolated extremely heavy falls since last 2 days. Rainfall (cm) reported in Meghalaya: Sohra-33 & Sohna.
Heat wave conditions reported in some parts with severe heat in isolated pockets over West Rajasthan; heat wave reported at many places over Vidarbha and in isolated pockets over U.P, M.P, Chhattisgarh, Marathawada, Haryana & Delhi, Saurashtra & Kutch and Madhya Maharashtra.
How is Heat Wave defined?
Heat wave is considered if maximum temperature of a station reaches at least 40°C or more for Plains, 37°Cor more for coastal stations and at least 30°C or more for Hilly regions. Following criteria are used to declare heat wave:a) Based on Departure from Normal to Heat Wave: Departure from normal is 4.5°C to 6.4°Co Severe Heat Wave: Departure from normal is >6.4°Cb) Based on Actual Maximum Temperature (for plains only) to Heat Wave: When actual maximum temperature ≥ 45°Co Severe Heat Wave: When actual maximum temperature ≥47°C To declare heat wave, the above criteria should be met at least in 2 stations in a Meteorological subdivision for at least two consecutive days and it will be declared on the second day .