Fri Jul 18 01:20:00 UTC 2025: Okay, here’s a summary of the provided Tamil text, followed by a news article version of the information:

**Summary:**

The Chennai Meteorological Department has issued a warning for heavy rainfall in 12 districts of Tamil Nadu, including Coimbatore, Nilgiri, and Chennai, due to an upper atmospheric cyclonic circulation. In the past 24 hours, Avalanchi in Nilgiri district received the highest rainfall (12 cm). The forecast includes the possibility of very heavy rainfall in the hilly areas of Coimbatore and Nilgiri, and heavy rainfall in other districts. Chennai and its suburbs are expected to experience cloudy skies with thunderstorms and lightning.

**News Article:**

**Heavy Rain Alert Issued for 12 Tamil Nadu Districts**

**Chennai, July 18, 2025:** The Chennai Meteorological Department has warned of heavy rainfall in 12 districts of Tamil Nadu today, Friday, July 18, 2025, (Aadi 2, Visvavasu Year). The alert is attributed to an upper atmospheric cyclonic circulation prevailing over the region.

The affected districts include Coimbatore, Nilgiri, Chennai, and Tiruvallur. The weather department’s report indicates that in the 24-hour period ending yesterday morning, Avalanchi in the Nilgiri district recorded the highest rainfall at 12 cm. Other significant rainfall amounts were recorded in Chinnakallar (Coimbatore – 11 cm), Tiruthani (Tiruvallur – 9 cm), and Sincona (Coimbatore) and Naduvattam (Nilgiri), both registering 8 cm.

“An upper atmospheric cyclonic circulation persists over Tamil Nadu and other southern states. Additionally, variations in the speed of westerly winds are being observed,” stated the Meteorological Department in its release. “There is a possibility of moderate rainfall with thunderstorms, lightning, and strong winds of up to 50 kmph in some places in Tamil Nadu, Puducherry, and Karaikal today.”

The department has specifically warned of the possibility of *very* heavy rainfall in isolated locations within the hilly regions of Coimbatore and Nilgiri districts. Heavy rainfall is also expected in Theni, Tenkasi, Chengalpattu, Tiruvallur, Chennai, Ranipettai, Kanchipuram, Vellore, Villupuram, and Tiruvannamalai districts.

For Chennai and its suburban areas, the forecast calls for partly cloudy skies with the likelihood of thunderstorms and lightning. Residents in the affected districts are advised to take necessary precautions.

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