Why do the north-east trade winds change their direction while blowing through the
Ganga valley?
Answer:
- A feeble high pressure area develops over the north-western part of India in the cold weather season. Light winds begin to blow outwards.
- These dry north-westerlies winds come in contact with the Indian trades (north-easterlies) over the Ganga valley.
- The direction of north-easterlies changes as a result of this contact as well as under the influence of topography.
- Their direction is north-westerlies down the Ganga valley and northerlies over the Ganga- Brahmaputra Delta.
- Over the Bay of Bengal, the trade winds retain their original north-easterlies direction, as they are free from the influence of any topography over the sea.