Monsoon

Unprecedented October 2021 Rainfall in Uttarakhand

Uttarakhand has seen unusual rainfall episode in the month of October 2021. The extreme rains during October 17 to 19 across the state and particularly at several places in districts under Kumaon division have been termed as highest rainfall in the recorded history as per Meteorological Circle (MC), Dehradun. This account is an attempt to document the historical rainfall events caused by combination of low pressure and western disturbance (WD) weather phenomena.

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Monsoon · Rainfall

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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Monsoon · Rainfall

SW Monsoon 2021: District wise rainfall in India

In the just concluded South West Monsoon 2021, India received 874.6 mm rainfall, about 99.32% of the Normal SW Monsoon rainfall or just 0.68% less than the normal SW Monsoon rainfall of 880.6 mm as per India Meteorological department. This rainfall will now be categorised as normal rainfall though till the beginning of Sept 2021, the rainfall at national level was 10% below normal. The massive 34.96% surplus rainfall in Sept 2021, thanks to a number of circulations contributed from the Bay of Bengal, ending with Cyclone Gulab and now possibly Cyclone Shaheen has contributed to wipe out the deficit.

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Monsoon · Rainfall

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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Monsoon · Rainfall

June-Aug 2021: District wise rainfall in India’s SW Monsoon

In the just concluded month of August 2021, the rainfall in India was a massive 24.13% below normal. Actual rainfall  was 195.9 mm, compared to normal rainfall of 258.2 mm, as per figures from India Meteorological Department (IMD). Contrast this with the rainfall in August last year, at 327 mm, was 26.6% above normal, ,and 44 year high. Even in July 2021, the rainfall was much higher at 266.1 mm, 6.73% below normal. In June 2021, the rainfall was 182.9 mm (10.96% above normal), not much below the August 2021 rainfall, when August is supposed to have much higher rainfall than June.

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Monsoon · Rainfall

July 2021: High Rainfall days in India’s districts

An analysis of the daily district wise rainfall data from India Meteorological Department (IMD) for the month of July 2021, the 2nd month of India’s South West Monsoon 2021 shows that there were 717 instances when district rainfall of a day was above 50 mm. [Considering that the normal monthly rainfall of India July is 285.3 mm, the average daily rainfall in this month is about 9.2 mm.] Such high rainfall instances included 595 instances when rainfall was 50-100 mm, 98 instances when it was 100-150 mm, 17 times it was 150-200 mm and 7 times above 200 mm. Interestingly, in June 2021[i] too 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[ii], the July 2021 rainfall all over India was 6.7% below normal.

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Monsoon · Rainfall

June July 2021 District Wise SW Monsoon Rainfall in India

In the just concluded month of July 2021, India received 266.1 mm rainfall, that is 6.73% below normal July rainfall of 285.3 mm, as per India Meteorological Department (IMD). This is in contrast with June 2021 rainfall, that was almost 11% surplus over Normal rainfall. Not only that surplus has been wiped out by the July 2021 deficit, the overall June July 2021 rainfall now is 449 mm, or about 0.7% below normal rainfall of 452.2 mm, as per IMD.

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Monsoon · Rainfall

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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Monsoon · Rainfall

June 2021: District wise rainfall in India’s SW Monsoon

In the just concluded June 2021, the first month of India’s South West 2021 monsoon, India received 182.9 mm rainfall, 10.96% or about 11% more than the normal June rainfall of 166.9 mm as per India Meteorological department. 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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Monsoon · Rainfall · River Basin

IMD continues callous reporting of River Wise Rainfall in Monsoon 2020

This rarely gets reported in media, but IMD (India Meteorological Department) also provides river basin wise rainfall figures. Here is an overview of the river basin wise rainfall during SW Monsoon 2020 (June-Sept 2020, though the monsoon withdrew much later), like the way we have been doing for the last three years[i]. Our earlier monsoon 2020 articles provided district wise figures for rainfall in June 2020[ii], June-July 2020[iii], June-Aug 2020[iv] and June Sept 2020[v].

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