The Deltas of Godavari, Krishna, and Kaveri
Explanation
The months of October and November constitute the period of the Retreating Monsoon, also known as the transition season. During this period, the low-pressure trough over the Gangetic plains weakens and is replaced by high-pressure systems, while the low-pressure center shifts to the Bay of Bengal.
Detailed Analysis:
- Cyclogenesis in the Bay of Bengal: The shift of the low-pressure zone to the Bay of Bengal creates conditions conducive to the formation of cyclonic depressions. These systems typically originate in the Andaman Sea or the southern Bay of Bengal.
- Trajectory and Impact: These tropical cyclones generally follow a westward or north-westward trajectory. Consequently, they frequently make landfall on the East Coast of India. The widespread deltas of the Godavari, Krishna, and Kaveri rivers are highly vulnerable to these storms, which often bring destructive winds and heavy rainfall.
- Regional Comparison: While the Arabian Sea also experiences cyclonic activity, the frequency and intensity of cyclones striking the West Coast (Konkan, Malabar, and Gujarat) during the October-November transition period are significantly lower compared to the East Coast. The West Coast is more commonly affected during the onset of the monsoon or pre-monsoon season.
Key Takeaway:
The transition season (October-November) is characterized by the migration of low-pressure systems to the Bay of Bengal, making the East Coast of India-specifically the deltas of the Godavari, Krishna, and Kaveri-the region most frequently struck by cyclones during this time.