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Indian Monsoon
Word monsoon derived from Arabic word Mausam.
Monsoons refers to tropical and sub-tropical seasonal reversal in both the surface winds and
associated precipitation, caused by differential heating between a continental-scale land mass and the
adjacent ocean.
Monsoons mainly occur in the regions of south Asia. The other regions include parts of equatorial
Africa, East and South-East Asia, northern Australia and, to a lesser extent, in the southwestern Unites
states. However, the most well-known monsoon occurs over Indian subcontinent.
South West monsoon,
In the Summer of Northern Hemisphere, The ITCZ (low pressure zone) moves to the north of equator
and established over the Indian sub-continent during month of July.
The South-East Trade winds after crossing the equator are deflected to the right by the Coriolis force.
forming the southwest monsoon. This pick up the moisture while travelling from sea to land and cause
precipitation once they hit the highlands of the Indian peninsula (Himalayan region).
Tibetan plateau is a flat land with high altitude and it will create a low pressure zone and ascended air
will affect on the Tropical easterly Jet Stream and High Pressure zone is Generated in Madagaskar
region and also by the Coriolis force this Tropical easterly Jet Stream will deflect toward madagaskar
region and again reverse back to Indian peninsular Boosting South-East Trade winds.
The Monsoonal winds after reaching the Indian peninsula split into two branches as Arabian branch
and Bay of Bengal branch. Arabian branch cause rain all along the Western coast and Bay of Bengal
branch cause West coast rains and then merged with Bay of Bengal branch in Himalaya region.
Season will be characterized by high heat, high humidity, extensive clouding and up to heavy rain
with strong surface winds.
If Southern Oscillation related with La Nina effect it will strong South West monsoon.
North-East monsoon,
Then ITCZ move to south of equator and then trade winds will reversal by the direction. The
continent cool rapidly forming a large area of high pressure over north central Asia. Dry, Colder air
will blows offshore creating the dry monsoon season.
During the winters, a subtropical jet stream blows in an eastward direction south of Himalayas. this
bring moisture from Mediterranean coast which causes winter rains over northern India.
Tropical Easterly jet stream sets over central India in the monsoonal months.
If El Nino related with South west Monsoon it will strong South West monsoon.
Cyclonic Rainfall will produce rainfall to Japan, South eastern china and Tamil Nadu region of India.

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Indian Ocean monsoon

  • 1. Indian Monsoon Word monsoon derived from Arabic word Mausam. Monsoons refers to tropical and sub-tropical seasonal reversal in both the surface winds and associated precipitation, caused by differential heating between a continental-scale land mass and the adjacent ocean. Monsoons mainly occur in the regions of south Asia. The other regions include parts of equatorial Africa, East and South-East Asia, northern Australia and, to a lesser extent, in the southwestern Unites states. However, the most well-known monsoon occurs over Indian subcontinent. South West monsoon, In the Summer of Northern Hemisphere, The ITCZ (low pressure zone) moves to the north of equator and established over the Indian sub-continent during month of July. The South-East Trade winds after crossing the equator are deflected to the right by the Coriolis force. forming the southwest monsoon. This pick up the moisture while travelling from sea to land and cause precipitation once they hit the highlands of the Indian peninsula (Himalayan region). Tibetan plateau is a flat land with high altitude and it will create a low pressure zone and ascended air will affect on the Tropical easterly Jet Stream and High Pressure zone is Generated in Madagaskar region and also by the Coriolis force this Tropical easterly Jet Stream will deflect toward madagaskar region and again reverse back to Indian peninsular Boosting South-East Trade winds. The Monsoonal winds after reaching the Indian peninsula split into two branches as Arabian branch and Bay of Bengal branch. Arabian branch cause rain all along the Western coast and Bay of Bengal branch cause West coast rains and then merged with Bay of Bengal branch in Himalaya region. Season will be characterized by high heat, high humidity, extensive clouding and up to heavy rain with strong surface winds. If Southern Oscillation related with La Nina effect it will strong South West monsoon.
  • 2. North-East monsoon, Then ITCZ move to south of equator and then trade winds will reversal by the direction. The continent cool rapidly forming a large area of high pressure over north central Asia. Dry, Colder air will blows offshore creating the dry monsoon season. During the winters, a subtropical jet stream blows in an eastward direction south of Himalayas. this bring moisture from Mediterranean coast which causes winter rains over northern India. Tropical Easterly jet stream sets over central India in the monsoonal months. If El Nino related with South west Monsoon it will strong South West monsoon. Cyclonic Rainfall will produce rainfall to Japan, South eastern china and Tamil Nadu region of India.