What are monsoon winds? How do they bring rainfall over the mainland of india?
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the seasonal wind of the Indian Ocean and southern Asia, blowing from the southwest in summer and from the northeast in winter. ... (in India and nearby lands) the season during which the southwest monsoon blows, commonly marked by heavy rains; rainy season.
Rainy Season – South West Monsoon SeasonSouth West Monsoon Season – June to mid-September.South West Monsoon Season is also known as hot-wet season.Sudden onset is the important feature of South West Monsoons.With the onset of monsoons, temperature falls drastically and humidity levels rise.Temperature during South West Monsoon SeasonSudden onset of South West Monsoons leads to significant fall in temperature [3° to 6°C].The temperature remains less uniform throughout the rainy season.The temperature rises in September with the cease of south-west monsoons.There is rise in temperature whenever there is break in the monsoons.The diurnal range of temperature is small due to clouds and rains.The highest temperatures are experienced at places west of the Aravali [38° to 40°C]. This is due to lack of clouds and hot continental air masses.Other parts of Northwest India also have temperatures above 30°C.The temperatures are quite low over the Western Ghats due to heavy rainfall.The coastal areas of Tamil Nadu and adjoining parts of Andhra Pradesh have temperatures above 30°C as they receive little rainfall during this season.Pressure and Winds During South West Monsoon SeasonLow pressure conditions prevail over northwest India due to high temperature.ITCZ (monsoon trough) lies along the Ganga plain. There are frequent changes in its location depending upon the weather conditions.The atmospheric pressure increases steadily southwards.Over the peninsular region, due to pressure gradient between north and south, winds blow in a southwest to northeast direction from Arabian sea and Bay of Bengal.Their direction undergoes a change in Indo-Gangetic plain where they move from east to west.Rainfall During South West Monsoon SeasonThree fourths of the total annual rainfall is received during this season.The average rainfall over the plains of India in this season is about 87 per cent.Normal date of the arrival of the monsoon is 20th May in Andaman and Nicobar Islands.The advance of the monsoon is much faster in the Bay of Bengal than in the Arabian Sea.
The normal date of onset of the southwest monsoon over Kerala i.e. the first place of entry in the mainland of India is 1st June.The monsoons advance quickly accompanied with a lot of thunder, lightning and heavy downpour. This sudden onset of rain is termed as monsoon burst.Sometimes monsoons are delayed or they come much earlier than normal.Normally the onset occurs between 29th May and 7th June.The earliest onset was on 11th May in 1918 and 1955, while the most delayed onset was on 18th June in 1972.
Rainy Season – South West Monsoon SeasonSouth West Monsoon Season – June to mid-September.South West Monsoon Season is also known as hot-wet season.Sudden onset is the important feature of South West Monsoons.With the onset of monsoons, temperature falls drastically and humidity levels rise.Temperature during South West Monsoon SeasonSudden onset of South West Monsoons leads to significant fall in temperature [3° to 6°C].The temperature remains less uniform throughout the rainy season.The temperature rises in September with the cease of south-west monsoons.There is rise in temperature whenever there is break in the monsoons.The diurnal range of temperature is small due to clouds and rains.The highest temperatures are experienced at places west of the Aravali [38° to 40°C]. This is due to lack of clouds and hot continental air masses.Other parts of Northwest India also have temperatures above 30°C.The temperatures are quite low over the Western Ghats due to heavy rainfall.The coastal areas of Tamil Nadu and adjoining parts of Andhra Pradesh have temperatures above 30°C as they receive little rainfall during this season.Pressure and Winds During South West Monsoon SeasonLow pressure conditions prevail over northwest India due to high temperature.ITCZ (monsoon trough) lies along the Ganga plain. There are frequent changes in its location depending upon the weather conditions.The atmospheric pressure increases steadily southwards.Over the peninsular region, due to pressure gradient between north and south, winds blow in a southwest to northeast direction from Arabian sea and Bay of Bengal.Their direction undergoes a change in Indo-Gangetic plain where they move from east to west.Rainfall During South West Monsoon SeasonThree fourths of the total annual rainfall is received during this season.The average rainfall over the plains of India in this season is about 87 per cent.Normal date of the arrival of the monsoon is 20th May in Andaman and Nicobar Islands.The advance of the monsoon is much faster in the Bay of Bengal than in the Arabian Sea.
The normal date of onset of the southwest monsoon over Kerala i.e. the first place of entry in the mainland of India is 1st June.The monsoons advance quickly accompanied with a lot of thunder, lightning and heavy downpour. This sudden onset of rain is termed as monsoon burst.Sometimes monsoons are delayed or they come much earlier than normal.Normally the onset occurs between 29th May and 7th June.The earliest onset was on 11th May in 1918 and 1955, while the most delayed onset was on 18th June in 1972.
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