An analysis of the daily district wise rainfall data from India Meteorological Department (IMD) for the month of September 2023, the last month of India’s South West Monsoon 2023 shows that there were 406 (417 in Sept 2022[i] and 489 in Sept 2021[ii]) instances when district rainfall of a day was above 50 mm. Such high rainfall instances included 330 (365 and 374 in Sept 2022 and 2021 respectively) instances when rainfall was 50-100 mm, 64 (47 and 84 in Sept 2022 and 2021) instances when it was 100-150 mm, 10 (3 and 20 in Sept 2022 and 2021) times when it was 150-200 mm and twice (two and eleven in Sept 2022 and 2021 respectively) when rainfall in a day was above 200 mm.
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High Rainfall days in India’s districts in August 2023
An analysis of the daily district wise rainfall data from India Meteorological Department (IMD) for the month of Aug 2023, shows that there were 500 (667 in Aug 2022[i] and 431 in Aug 2021) instances when district rainfall of a day in a district was above 50 mm. Such high rainfall instances included 424 (553 in Aug 2022 and 371 in Aug 2021) instances when rainfall was 50-100 mm, 67 (98 in Aug 2022 and 48 in Aug 2021) instances when it was 100-150 mm, 5 (13 in Aug 2022 and 11 in Aug 2021) times it was 150-200 mm and 4 (3 in Aug 2022 and 1 in Aug 2021) above 200 mm. Interestingly, in June 2023[ii] and July 2023[iii] there were 451 and 855 instances when rainfall was above 50 mm, while in June 2022[iv] and July 2022[v] there were 462 and 809 instances when rainfall in a district was above 50 mm. The July 2023[vi] and June 2023[vii] rainfall over India was 13.1% above normal and 10.1% below normal respectively, while the July 2022[viii] and June 2022[ix] rainfall all over India was 16.8% above normal and 8% below normal respectively.
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June 2023: High Rainfall district days in India’s SW Monsoon
An analysis of the daily district wise rainfall data from India Meteorological Department (IMD) for the month of June 2023, the first month of India’s South West Monsoon 2022 shows that there were instances (462 in June 2022[i] and 442 in June 2021) when district rainfall of a day was above 50 mm. This is high considering that the rainfall of India in June 2023 was 148.6 mm[ii], the rainfall of India in June 2022 was 152.3 mm[iii], or daily average rainfall is about 5 mm. The high rainfall instances in June 2023 included 339 (339 and 371 in June 2022 and 2021) instances when rainfall was 50-100 mm, 68 instances (68 and 59 in June 2022 & 2021) when it was 100-150 mm, 26 (26 and 5 times in June 2022 & 2021) times it was 150-200 mm and 29 (29 & 7 times in June 2022 & 2021) times above 200 mm.
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June 2023: District wise rainfall in India’s SW Monsoon
In the just concluded month June 2023, the first month of India’s South West 2023 monsoon, India received 148.6 mm rainfall, 10% below the normal June rainfall of 165.3 mm as per India Meteorological department. In June 2022, the rainfall was 152.3 mm, 8% below normal, in June 2021, the rainfall was 182.9 mm[i], about 11% above normal and in June 2020, the rainfall was 196.9 mm, or about 18% above normal and in June 2019 it was 33% below normal.
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High Rainfall days in India’s districts in SW Monsoon 2022
An analysis of the daily district wise rainfall data from India Meteorological Department (IMD) for India’s South West Monsoon 2022 shows that there were 2079 instances when a district rainfall of a day was above 50 mm. Such high rainfall instances included 1712 instances when rainfall was 50-100 mm, 288 instances when it was 100-150 mm, 53 times it was 150-200 mm and 26 times above 200 mm. Out of 694 districts of India, 527 districts or, about 76% of the districts experienced such high rainfall days during SW monsoon 2021.
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High Rainfall days in India’s districts in SW Monsoon 2021
An analysis of the daily district wise rainfall data from India Meteorological Department (IMD) for India’s South West Monsoon 2021 shows that there were 2079 instances when a district rainfall of a day was above 50 mm. Such high rainfall instances included 1712 instances when rainfall was 50-100 mm, 288 instances when it was 100-150 mm, 53 times it was 150-200 mm and 26 times above 200 mm. Out of 694 districts of India, 527 districts or, about 76% of the districts experienced such high rainfall days during SW monsoon 2021.
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High Rainfall days in India’s districts in Sept 2021
An analysis of the daily district wise rainfall data from India Meteorological Department (IMD) for the month of September 2021, the last month of India’s South West Monsoon 2021 shows that there were 489 instances when district rainfall of a day was above 50 mm. The normal monthly rainfall of India for Sept is 170.2 mm and actual rainfall was a huge 34.96% above normal at 229.7 mm[i], the actual average daily rainfall in this month was about 7.66 mm. Such high rainfall instances included 374 instances when rainfall was 50-100 mm, 84 instances when it was 100-150 mm, 20 times it was 150-200 mm and eleven times above 200 mm.
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High Rainfall days in India’s districts in August 2021
An analysis of the daily district wise rainfall data from India Meteorological Department (IMD) for the month of Aug 2021, 3rd month of India’s South West Monsoon 2021 shows that there were 431 instances when district rainfall of a day was above 50 mm. The normal monthly rainfall of India Aug is 258.2 mm and actual rainfall was a huge 24.13% below normal at 195.9 mm[i], the actual average daily rainfall in this month was about 6.45 mm. Such high rainfall instances included 371 instances when rainfall was 50-100 mm, 48 instances when it was 100-150 mm, 11 times it was 150-200 mm and just once above 200 mm. Interestingly, in June 2021[ii] and July 2021[iii] there were seven instances when rainfall was above 200 mm, when the rainfall is supposed to be much below July rainfall. As noted in detailed article[iv], the July 2021 rainfall all over India was 6.7% below normal.
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High Rainfall days in India’s districts in June 2021
An analysis of the daily district wise rainfall data from India Meteorological Department (IMD) for the month of June 2021, the first month of India’s South West Monsoon 2021 shows that there were 442 instances when district rainfall of a day was above 50 mm, which is high considering that the normal monthly rainfall of India in this month is 166.9 mm, or daily average rainfall is about 5.6 mm. Such high rainfall instances included 371 instances when rainfall was 50-100 mm, 59 instances when it was 100-150 mm, 5 times it was 150-200 mm and 7 times above 200 mm. As noted in detailed article, the June 2021 rainfall all over India was 11% above normal.
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Overview of CWC Flood Monitoring Sites 2018: INDIA
Central Water Commission is the only agency doing flood forecasting in India. As per CWC’s Flood Forecasting website[i] the Data Flow Map has information about 226 Flood Forecast Sites in the country comprising of 166 Level Forecast Sites and 60 Inflow Forecast Sites. It also monitors 700 Flood sites, information made available through List Based Exploration and Hydrograph View, but no flood forecasting is done for these sites.
In order to better understand the CWC’s flood monitoring and forecasting work, SANDRP has published report of CWC’s Level Forecast, Inflow Forecast and level monitoring sites in 5 zones of North India[ii], North East India[iii], East India[iv], South India[v] and West India[vi]. Through this report, we have presented all the data at one place with links to separate zone wise reports with detailed description.
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SANDRP 