The India Meteorological Department said that the monsoon is likely to start back from the mainland from October 6, as the country has recorded an average rainfall of about 87 cm in the subdivisions, which is about 88 cm more than the normally received during monsoon. is less. The amount of rain during the monsoon is calculated as the amount of rainfall received between June and September 30.
September’s rainfall, 223 millimeters (mm), is the second highest since 1993 when it received 239 mm (40% above normal). In 2019, India recorded about 250 mm, or about 52% above normal.
Had it not been for the exceptional rains last month, India could have received very little rain. With the weakening of rainfall that began in mid-July and lasted through most of August, India’s rainfall deficit had increased to about 24%. As of Thursday, India has received 99% of its monsoon rainfall.
At the onset of the monsoon, the IMD had forecast rainfall to be “above normal” or about 101% of the long period average (88 cm) over the four months. After a staggering decrease in August, the second rainiest month, it revised it to say it would be “at the low end of normal” without specifying a new number.
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However, the IMD also said that September’s rainfall will be above normal, or “over 110%” of normal for the month. September rains were expected to be good due to transition temperatures in the central Pacific Ocean, where a La Nia – characterized by cooler than normal sea surface temperatures – was taking shape.
While September is usually the month that marks the beginning of the end of the monsoon’s four-month migration to India, both 2020 and 2019 have seen rains during the month.
In 2019, September’s rainfall was 152%, or close to 25 cm, of what the country receives in August (26 cm), which is considered the second highest rainfall of the monsoon months. That year also India received the highest monsoon rainfall since 1994. Last September, 17.7 cm of rainfall was not much, but above normal.
DS, Pai, Head, Climate Research Services, IMD, Pune said that the additional monsoon rains of September 3 were unusual, but did not indicate a trend so far.
“There is always variability within the monsoon and that was part of the rainfall we saw in September. We will have to wait more to see if there is a trend,” Mr Pai said.
Among all regions, Central India received 83% above normal, North-West India 40% and Southern India 24% above normal. However, a decrease of 30% was observed in Northeast and East India. IMD Director General M. Mohapatra said that generally the heavy rains over central India correspond to weak rains in the northeast due to the movement of the monsoon system.
Other factors that contributed to the strong September rains were favorable conditions in the Indian Ocean as well as a rain-bearing system in the Bay of Bengal, resulting in Cyclone Gulab passing through Andhra Pradesh, but whose effects were felt as far as Maharashtra. Torrential rain in the state.
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