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Refer to figures.
Weather conditions at Mumbai (India) during January are mainly influenced by the:
  • A
    NE monsoon.
  • B
    SW monsoon.
  • C
    SE monsoon.
  • D
    NW monsoon.

There are three monsoon flows: the NE, NW (December, January, February) and SW (June, July, August).

>The NE MONSOON of Asia blows from the winter Siberian High and is consequently cool and comparatively dry giving clear weather over Bangladesh, Burma and Thailand.

SE India, Sri Lanka and east coast of West Malaysia are also affected by this monsoon, but here the over-sea track picks up moisture and produces heap type clouds and thunderstorms and heavy precipitation when crossing coastal mountain ranges.

>The NW MONSOON is really an extension of the NE Monsoon which backs on crossing the Equator southbound and brings Cu, Cb and thunderstorms to North Australia and New Guinea.

>The SW MONSOON or Summer Monsoon is produced by the SE trade wind crossing the Equator and veering to SW and thence to the summer Baluchistan Low.

Having a long sea track, this monsoon is very moist and produces much heavy Cu and Cb with large scale thunderstorms.
It has a more serious effect on flying than the NE Monsoon, with heavy thunderstorms, low cloud base and severe turbulence.

It affects India, Sri Lanka, Burma and exposed coasts of West Malaysia.
The SW Monsoon also affects the West African coast, notably Guinea, Ghana and North Nigeria.

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