An energetic northeast monsoon season, which noticed 5 consecutive low stress programs develop over the north Indian Ocean area, introduced heavy rains throughout south India in current weeks. In October, Kerala alone acquired a file rainfall of 589.9 mm (94 per cent surplus), the best in 122 years. Rain continues over South India since August and extra rains are possible in December.
Warmest November since 1901
This 12 months, most elements of South India haven’t seen any discount in rain exercise since August. The southern peninsula has witnessed an prolonged monsoon season with little respite within the final 4 months. Between October 1 and November 30, Kerala acquired the best rainfall at 115 per cent, adopted by Puducherry (106%), Karnataka (103%), Tamil Nadu (83%) and Andhra Pradesh (47%).
This is as a result of delayed exit of the Southwest Monsoon in October, instantly adopted by the onset of the Northeast Monsoon on 27 October. The ongoing rainfall exercise in November was nearly at its peak over Tamil Nadu, Kerala, Puducherry and Coastal Andhra Pradesh. Officials of the India Meteorological Department (IMD) mentioned that South India has skilled the best rainfall in November since 1901.
This November, Andhra Pradesh, Tamil Nadu, Puducherry, Kerala and South Interior Karnataka collectively acquired 316.2 mm, which is 149 per cent increased than the lengthy interval common (LPA) of 117.5 mm in November.
Increase in heavy, very heavy rainfall occasions
Even although the northeast monsoon brings rain to southern India, November has seen an unprecedented variety of heavy rainfall occasions.
The rains over South India had been primarily on account of robust and moist easterly winds and protracted low stress programs over the Bay of Bengal.
The variety of heavy rainfall occasions elevated four-fold between 2017 and 2021. The variety of very heavy rain occasions elevated from 26 to 168 within the final 5 years, whereas November 2021 noticed extraordinarily heavy rains, which was 11 towards only one in 2017. , indicating a greater than tenfold improve.
“There has been a significant increase in the number of heavy and very heavy rainfall events. In November this year, most of these were concentrated in South India, mostly in Tamil Nadu and Coastal Andhra Pradesh,” mentioned Mrityunjay Mohapatra, Director General, IMD.
Box : Rainfall occasions in November
| Year | rain vary | ||
| obese (64.5 to 115.5 mm in 24 hours) | too heavy (115.6 to 204.4 mm in 24 hours) | very heavy (above 204.5 mm in 24 hours) | |
| 2021 | 645 | 168 | 1 1 |
| 2020 | 247 | 98 | 1 1 |
| 2019 | 116 | 24 | 00 |
| 2018 | 135 | 36 | 04 |
| 2017 | 139 | 26 | 01 |
Source: IMD
what’s the cause for the rain
The rains over South India had been primarily on account of robust and moist easterly winds and protracted low stress programs over the Bay of Bengal. Last month, 5 low stress programs developed over the North Indian Ocean area (collectively within the Bay of Bengal and the Arabian Sea). Two of them quickly went into despair.
“The normal climate for the number of low pressure systems in November is anywhere between 2.8 to 3,” mentioned senior official of IMD’s National Weather Forecasting Centre, New Delhi, RK Jenamani. But 2021 is the third 12 months after 1990 when greater than 5 low stress programs have developed within the North Indian Ocean area throughout November, the opposite two years being 1994 and 2015.
The Meteorological Department has mentioned in its forecast for December that the monsoon can be ‘good’ over South India and there’s a chance of extra rains all through the month.
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With inputs from TheIndianEXPRESS
