Around September, with the sun fast retreating south, the northern land mass of the Indian subcontinent begins to cool off rapidly. With this air pressure begins to build over northern India. The Indian Ocean and its surrounding atmosphere still holds its heat. This causes the cold wind to sweep down from the Himalayas and Indo-Gangetic Plain towards the vast spans of the Indian Ocean south of the Deccan peninsula. This is known as the North-East Monsoon or Retreating Monsoon.They cross India diagonally from northeast to southwest. However, the large indentation made by the Bay of Bengal into India's eastern coast means that the flows are humidified before reaching Cape Comorin and rest of Tamil Nadu, meaning that the state, and also some parts of Kerala, experience significant precipitation in the post-monsoon and winter periods.However, parts of West Bengal, Orissa, Andhra Pradesh, Karnataka and North-East India also receive minor precipitation from the northeast monsoon.
The winds are generally dry as we experienced in september mid. Sometimes when the Bay of Bengal cycle gets activated. thus it deposits moisture and rain clouds in the north-east air current. as we are quiet near the formation zone in bay of bengal we receive direct threats from the Bay as it is going on currently.
The Bay is currently warm enough to generate clouds and with low pressure. it looks as if the bay will create disturbances for another week. Once the oceans are cooled,the activity is stopped.
We are going to TIME the winter in NAgpur as we did for the monsoon.
Winters come in NGp when the COOL AIR comes from the north. It requires the formation of intense low pressure areas in MEDITERANEAN SEA..
The current date for winter<night temp below 17 C> is Oct 29 2009
METD
Akshay
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