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| Cloud-Image by Hans Braxmeier from Pixabay |
1. Post monsoon can also be called an autumn. This period is considered as retreating of summer monsoon and is transitional months when the pressure and upper wind systems undergo gradual change.
2. Intertropical Convergence Zone (ITCZ) moves towards equator and temperature starts falling down. Also, autumn sees the southward swing of the Equatorial Trough and the zone of maximum convection, which lies just to the north of the weakening easterly jet.
3. By October, the easterly trades of the Pacific affects the Bay of Bengal and generate disturbances at their confluence with the equatorial westerlies. Occasional showers with thunderstorm and wind directions undergoes a change i.e. winds start blow from west.
4. Weakening of low pressure system over the Indian subcontinent as a whole is the most important climatic characteristics feature. But the low pressure center is found over the Bay of Bengal where water surface temperature reach a maximum in this season.
5. Major season for Bay of Bengal cyclones that cause the October/November rainfall.
6. During October, the westerly jet re-establishes itself south of the Tibetan Plateau, often within a few days, and cool season conditions restored over most of south and East Asia. Temperatures decreases all over and the nights become cool. By November sub-zero temperatures are reached over high terrain. Hence, this is really the cool season.
Source: Ways of the Weather, P A Menon, National Book Trust, India
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