The withdrawal of South-West monsoons in the country will be characterised by partly cloudy sky till September 25, with isolated thunderclouds developing during next 24 hours in certain parts of the country.
According to Indian Meteorological department (IMD) officials, a low pressure area lies over Chhattisgarh and adjoining areas of east Madhya Pradesh and surroundings which would move along the westward direction, resulting in scattered and sporadic rains.
As a result, rains/thundershowers are likely in parts of Maharashtra, Madhya Pradesh, besides, Odisha, Chhattisgarh, and along west coast till the first half of the week and considerably decrease thereafter. There will also be Increase in rain/thundershowers over Gujarat region this week.
However, simultaneously, there has been withdrawal of monsoon from the northern States including Jammu & Kashmir, Himachal Pradesh, Punjab; certain parts of Haryana and Rajasthan, since the past week. According to the figures from IMD, the country has so far received 864.7 mm of rain as against the average of 829.2 mm indicating four percent increase. It has predicted that rainfall over the country for the rest of the month is likely to be normal (90-110 %) of long period average (lPA).
The weather experts have, however, warned that in the years to come the monsoon rainfall is expected to intensify and rainy season to be more prolonged, with delayed retreats.
In fact, the changing rain patterns were witnessed this year too, said the experts. The duration of the south-west monsoon this year has extended this year compared to the past few decades, arriving almost a month ahead of schedule.
They further pointed that instances of heavy rain (more than 100mm a day) and very heavy rain (exceeding 150mm / day) are increasing, while those of low and moderate rain (below 100mm / day) is on the decline.
According to them, the influence of forest degradation and other environmental effects on the rain pattern cannot be ruled out in the coming years. These changes in rain pattern may be due to multiple factors, ranging from ocean dynamics, depression besides man made changes.