Chennai Northeast Monsoon Heavy Rainfall

Summary of Northeast Monsoon Rainfall in Tamil Nadu

Key Facts & Data

• Geographical Impact: Chennai received heavy rainfall due to the onset of the northeast monsoon, especially affecting areas like Kargil Nagar and Tiruvottiyur with 12 cm, Kathivakkam and Tondiarpet with 9 cm, and Ennore, Basin Bridge, and Manali with 7 cm within just a few hours.
• Rainfall Statistics: In a significant downpour, Uthiramerur in Kancheepuram recorded the highest rainfall of 15 cm, while around 84 weather stations reported substantial rainfall over a 24-hour period.
• Rainfall Deficit: The recent rains have reduced the state's rainfall deficit to 3%, categorizing it as normal for October.

Weather Forecast & Alerts

• Alerts Issued: The Regional Meteorological Centre (RMC) issued a yellow alert for 17 districts, particularly in northern and interior regions including Cuddalore and Tiruchi, indicating a high possibility of heavy rainfall through October 23.
• Predictions for Future Rainfall:
  • A low-pressure area may form over the southwest Arabian Sea around October 18.
  • Anticipated weather systems could deliver further intense rainfall, particularly in districts along the Western Ghats, with isolated heavy rainfall expected to reach up to 20.4 cm on October 20.
  • Rainfall intensity is predicted to decline after October 25, with a new weather system forming over the Bay of Bengal in the last week of October.

Meteorological Insights

• Cyclonic Circulation: The current heavy rainfall is linked to an upper air cyclonic circulation over north Tamil Nadu and adjoining coastal Andhra Pradesh, facilitating sustained rainfall across the State.

Government & Regulatory Oversight

• The Regional Meteorological Centre (RMC) is actively monitoring weather patterns and issuing alerts to keep the public informed about potential weather hazards and necessary precautions.

Environmental Considerations

• This downpour highlights environmental challenges, particularly concerning water management in delta and interior districts that are currently water-stressed but may benefit from the influx of water due to recent rains.

Conclusion

The northeast monsoon has initiated a significant rainfall event across Tamil Nadu, particularly affecting Chennai and its adjacent districts, impacting agricultural water resources positively, while also presenting challenges related to flash floods in susceptible areas. The government and meteorological agencies are actively engaged in monitoring and preparing citizens for potential weather impacts.