Rain in Delhi: These 2 weather systems cause heavy rainfall during September

There is an unusual change in the weather in Delhi as the national capital has never received heavy rains since the end of September. However, meteorologists have found out the reason behind the unexpected rains in September. According to a report in Hindustan Times, the sister publication of Livemint, a rare interaction of two weather systems – a western disturbance and a low pressure system – is causing rain in the capital – 250 km south-west of the city.

The daily added in its report that the two weather systems may have also delayed the withdrawal of monsoon in the city. The complete withdrawal of monsoon in Delhi, which is scheduled for September 25, is now expected to be delayed.

Delhi received 5.6 mm of rain on Wednesday and 31.2 mm till 5.30 pm on Thursday. And, the India Meteorological Department (IMD) has predicted more rain in Delhi over the weekend.

RK Jenamani, senior scientist at IMD’s National Weather Forecasting Centre, said there is an interaction between a western disturbance and the remnants of a low pressure area over north-west Madhya Pradesh, about 250 km south-west of Delhi. In addition, there is a huge supply of moisture from the Arabian Sea which is continuing. Similar conditions will prevail for the next 24 to 36 hours but the amount of rain will reduce on Friday.

Changes in the weather system of Delhi are also affecting neighboring states like Uttar Pradesh, Punjab and Rajasthan.

According to IMD scientists, there is a possibility of heavy rains in Uttar Pradesh in three-four days. However, the intensity of rain has reduced over Rajasthan, Punjab, Jammu and Kashmir.

The IMD on Tuesday said that the southwest monsoon has retreated from southwest Rajasthan and adjoining parts of Kutch, three days after the normal date of September 17.

Generally, it takes about a week for the monsoon to retreat from Delhi after its withdrawal from western Rajasthan.

The withdrawal of the southwest monsoon is announced if the region does not receive rainfall for five days, along with the development of anti-cyclonic circulation and water vapor imagery indicating dry weather conditions in the region.

Overall, India has received 7% excess rainfall this year, while South India has received 26% excess rainfall. According to the IMD data, East and Northeast India has seen 17 per cent rainfall deficiency, while North-West has witnessed 3% rainfall deficiency.

Delhi has recorded 36 per cent of the rain deficit; PB 20%; Bihar 30%; Jharkhand 20% and Uttar Pradesh 33% respectively.

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