Fri Jul 18 01:20:00 UTC 2025: Okay, here’s a news article summarizing the provided Tamil text:

**Heavy Rainfall Alert Issued for 12 Districts in Tamil Nadu**

**Chennai, July 18, 2025:** The Chennai Meteorological Department has issued a heavy rainfall warning for 12 districts across Tamil Nadu today, July 18, 2025, due to an atmospheric upper air cyclonic circulation.

The affected districts include Coimbatore, Nilgiris, Chennai, Tiruvallur, Theni, Tenkasi, Chengalpattu, Ranipet, Kanchipuram, Vellore, Villupuram and Tiruvannamalai.

In the 24 hours leading up to yesterday morning, Avalanchi in the Nilgiris district recorded the highest rainfall at 12 cm. Significant rainfall was also reported in Chinnakallar (Coimbatore, 11 cm), Tiruttani (Tiruvallur, 9 cm), and Sincona (Coimbatore) and Naduvattam (Nilgiris) with 8 cm each.

The Meteorological Department’s report states that the upper air cyclonic circulation over Tamil Nadu and other South Indian states, coupled with a change in the speed of westerly winds, is the cause of the anticipated heavy rainfall.

“There is a possibility of moderate rain with thunderstorms, lightning and strong winds of up to 50 kmph in some places in Tamil Nadu, Puducherry and Karaikal today,” the report stated. “Heavy to very heavy rainfall is likely in some places in the hilly areas of Coimbatore and Nilgiris districts. Heavy rain is possible in some places in Theni, Tenkasi, Chengalpattu, Tiruvallur, Chennai, Ranipet, Kanchipuram, Vellore, Villupuram and Tiruvannamalai districts today.”

The forecast for Chennai and its suburbs predicts partly cloudy skies with a chance of thunderstorms and lightning. Residents in the affected districts are advised to take necessary precautions.

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