# Tamil Nadu monsoon flooding and cyclone Arnab threat

> Live situation record from CLSTR: https://clstr.news/situations/tamil-nadu-monsoon-flooding-and-relief-efforts
> Updated: 2026-10-22T17:45:03.000Z. Sources: 30. Developments: 2.

Heavy monsoon rains driven by an active northeast monsoon have caused significant flooding and waterlogging across Tamil Nadu, particularly in Chennai and several southern districts. Areas such as Sankarankoil have reported severe waterlogging, while intense downpours have increased water levels in reservoirs and caused surges at waterfalls throughout the state. In response to the weather, Chief Minister C. Joseph Vijay has launched a statewide rainwater harvesting awareness campaign featuring the ‘Thuli’ logo to promote groundwater conservation. Relief operations are underway, with Water Resources Minister Anand supervising debris removal and addressing flooding in areas like the T Nagar constituency. The government has organized food supplies for thousands of affected residents, while Rahul Gandhi, the Leader of the Opposition in the Lok Sabha, has called on party workers to assist vulnerable families in coordination with local authorities. Meteorological forecasts indicate the situation may intensify, as a low-pressure area over the southeast Bay of Bengal is expected to develop into ‘Cyclone Arnab’ by October 26. The India Meteorological Department (IMD) expects the system to move west-northwestward, potentially making landfall between the northern Andhra Pradesh and southern Odisha coasts around October 28. As the threat grows, Tamil Nadu has issued red and orange alerts for multiple districts. In the Nilgiris, heavy rain has already triggered landslides and fallen trees, leading authorities to urge tourists to avoid mountain routes. The Nilgiris has been placed under a red alert for extremely heavy rainfall. In Coimbatore, heavy rain has led to school closures in certain taluks. The state government has also ordered precautions to protect paddy crops and directed schools to inspect building stability. Regional preparedness is increasing as the system intensifies. Odisha has activated its disaster response machinery, placing 205 fire and emergency teams on high alert and cancelling leave for collectors and critical officers.

## Claims

- A low-pressure area in the Bay of Bengal is expected to become a cyclonic storm named Arnab by October 26. (corroborated by 12 sources)
- Cyclone Arnab may approach the north Andhra Pradesh and south Odisha coasts. (corroborated by 9 sources)
- Chennai is experiencing waterlogging and moderate to heavy rainfall due to the northeast monsoon. (corroborated by 3 sources)
- The name Arnab was proposed by Bangladesh. (corroborated by 3 sources)
- Tamil Nadu Chief Minister C. Joseph Vijay reviewed monsoon preparedness and relief operations. (corroborated by 3 sources)
- The Nilgiris district has been placed under a red alert for extremely heavy rainfall. (corroborated by 3 sources)
- Wind speeds from the cyclone could reach 70–80 kmph with gusts up to 90 kmph. (corroborated by 2 sources)
- Ten districts in Kerala are under an orange alert for heavy rain on October 24. (single source)
- Southern Thailand faces a high risk of flash floods and rapid runoff from October 24 to 28. (single source)

## Timeline

### 2026-10-22: Cyclone Arnab expected to form in Bay of Bengal by October 26

A cyclonic storm named Arnab is expected to form in the Bay of Bengal by October 26, bringing heavy rain and flood risks to India, Bangladesh, and southern Thailand.

27 sources. https://clstr.news/cluster/tamil-nadu-experiences-heavy-monsoon-flooding-and-relief-efforts

### 2026-10-21: Tamil Nadu officials launch rainwater harvesting initiative amid heavy rains

Tamil Nadu Chief Minister Vijay launched the ‘Thuli’ rainwater harvesting campaign, while Minister Anand managed flood relief and debris removal in Chennai following heavy monsoon rains.

3 sources. https://clstr.news/cluster/tamil-nadu-officials-launch-rainwater-harvesting-initiative-amid-heavy-rains

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Cite as: Tamil Nadu monsoon flooding and cyclone Arnab threat. CLSTR, https://clstr.news/situations/tamil-nadu-monsoon-flooding-and-relief-efforts