how does the withdrawal of monsoon withdraw from land to see
Answers
Answer:
a) Withdrawal from extreme north-western parts of the country is not attempted before 1st September.
b) After 1st September:
The following major synoptic features are considered for the first withdrawal from the western parts of NW India.
i) Cessation of rainfall activity over the area for continuous 5 days.
ii) Establishment of anticyclone in the lower troposphere (850 hPa and below)
iii) Considerable reduction in moisture content as inferred from satellite water vapour imageries and tephigrams.
Explanation:
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India’s long-time beneficiary visitor, the south-west monsoon started withdrawing (officially) from Wednesday, September 23. In the first round of withdrawal, the monsoon withdrew from western Rajasthan and some parts of north-western Gujarat. The conditions for the withdrawal were in place from the past weekend when simultaneously heavy rains were impacting Assam and Meghalaya. As was expected and mentioned in my previous blog, heavy rains triggered landslides and flooding in Assam, killing around 36 people till now and affecting over one million people. Goalpara district of Assam has been the worst hit. In Meghalaya, 39 people have lost their lives (official toll on Thursday) and many have been affected. Sadly, the death toll will be rising in the coming days along with a rising threat from water-borne diseases once the flood water recedes.
In the second round of withdrawal, on Friday, September 26, monsoon withdrew from more parts of Rajasthan (it now has almost exited Rajasthan), Gujarat and parts of Punjab and Haryana.
Monsoon to withdraw further in the coming day
As can be seen from the above GFS weather model, showing conditions at 850mb (or roughly 5,000 ft above sea level), on October 1, clockwise winds are visible over aastern Gujarat. That’s an anticyclone or a high pressure region which will continue bringing dry winds in India from north-western parts like Pakistan. For this reason, no wind from Arabian Sea will enter India at this level and this will maintain the momentum of monsoon’s withdrawal from northern parts of India and initiate the withdrawal in central India also. We can expect the monsoon withdrawing from entire Punjab, Haryana, Delhi NCR, Rajasthan, more parts of Gujarat, some parts of Madhya Pradesh and Himachal Pradesh by this month end.