New Delhi: Many parts of the country are in the grip of heat wave, but overall India is expecting a “normal” monsoon this year, the Meteorological Department said. IMD Director General of Meteorology Mrityunjay Mohapatra said, “India will have normal monsoon this year as 99% of the country will receive rainfall.”
However, he said that some parts of the country may receive below normal rainfall. “As predicted, there will be a uniform distribution of rainfall. For Northeast, Kerala, Tamil Nadu, Jammu and Kashmir and parts of Punjab, Haryana and Himachal Pradesh, rainfall may be below normal,” IMD DG was quoted by ANI. ,
Meanwhile, the Met Office on Thursday (April 14) had introduced a new all-India rainfall normal – 868.6 mm – for the southwest monsoon based on data from 1971 to 2021, which will be used as the benchmark to measure rainfall in the country. as will be done. , Mrityunjay Mohapatra said the new rainfall normal of 87 cm for the southwest monsoon season is a slight drop from the previous “normal” of 88 cm, which was calculated based on the 1961-2010 rainfall data.
The IMD issues weather forecasts and summaries in terms of departure from normal, which is the Long Period Average (LPA) of rainfall received over a 50-year period. ‘Normal’ rainfall or LPA is updated every 10 years. “At present, the southwest monsoon is passing through a dry era, which started in the 1971-80s,” he said. According to Mohapatra, the decadal average of southwest monsoon rainfall for all of India for the decade 2011-20 is minus 3.8 per cent below the long-term average.
“The next decade i.e. 2021-30 will come closer to normal and the southwest monsoon is likely to enter a humid era from 2031-40s,” he said. The All India Annual Rainfall Normal based on 1971-2021 data has been fixed at 1160.1 mm as against the earlier normal of 1176.9 mm based on 1961-2010 data.
The southwest monsoon rainfall, spread over the months of June-September, contributes to 74.9 per cent of the annual rainfall, while the pre-monsoon rainfall – March-April-May – contributes 11.3 per cent. Post-monsoon rainfall – October, November, December – contributes 10.4 per cent to annual rainfall, while winter rains in January and February contribute 3.4 per cent of annual rainfall.
Normal rainfall has been calculated using rainfall data from 4,132 rain gauge stations distributed in 703 districts of the country.