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Tropical monsoon climates
Wet season (MAY TO OCTOBER)
In June the ITCZ moves polwards towards the tropic of cancer and
extends just over northern India.
Intense heating takes place here, which causes low pressure.
South Westerly winds, deflected by the Coriolis force, carry warm
moisture air from the Indian Ocean.
The low pressure attracts the warm, moist unstable air from the
Indian Ocean, bringing heavy monsoon rain.
The rainfall is further increased by the uplift of air over the foothills
of the Himalayas and by intense convection.
Dry season (JAN TO MAY)
The ITCZ moves towards the tropic of Capricorn.
The continental land mass at the centre of ASIA experiences intense
cooling. A large area of high pressure develops.
North Easterly winds, which are cool and dry, bring dry conditions to
most of the Indian subcontinent.
Winds blow from high to low pressure
The ITCZ is area of low pressure in equatorial latitudes.
Low pressure: air cools as it rises, therefore it can't hold much water
vapour. Water condenses into droplets, becoming clouds. Lots of
precipitation can be associated with wet weather i.e. depressions,
High pressure: air warms as it descends. This leads to evaporation of most