The northeast monsoon, also known as the retreating monsoon, is a seasonal wind reversal that brings rain to parts of India and Sri Lanka from October to December:
When it occurs
The northeast monsoon occurs after the southwest monsoon withdraws in mid-October.
What it causes
Cold winds from the Himalayas and Indo-Gangetic Plain sweep down towards the Indian Ocean, picking up moisture from the Bay of Bengal.
Where it brings rain
The northeast monsoon brings rain to parts of coastal Andhra Pradesh, Tamil Nadu, Kerala, and parts of southern Karnataka. It's the main source of rainfall for Tamil Nadu, providing 50% to 60% of the state's rain.
Other effects
The northeast monsoon is associated with the seasonal reversal of surface and lower tropospheric winds. This change in winds is associated with the southward movement of the continental tropical convergence zone (CTCZ).
Importance
The northeast monsoon is important for agricultural planning and disaster management. The passage of cyclones and depressions over the North Indian Ocean (NIO) region can significantly affect the northeast monsoon.
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