According to the latest weather bulletin, a trough extending from East Vidarbha to Tamil Nadu through Telangana and Andhra Pradesh, along with an upper-air cyclonic circulation over the southeast Arabian Sea and adjoining Kerala region, is influencing weather conditions across the state.
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As a result, light to moderate rainfall with thunderstorms is likely at many places across Tamil Nadu, Puducherry and Karaikal. Heavy rain accompanied by lightning and strong winds of 40-50 kmph may occur in isolated locations across 27 districts, including Nilgiris, Coimbatore, Erode, Tiruppur, Theni, Dindigul, Madurai, Sivaganga, Pudukkottai, Thanjavur, Tiruvarur, Nagapattinam, Mayiladuthurai, Karur, Tiruchirappalli, Ariyalur, Perambalur, Cuddalore, Kallakurichi, Villupuram, Tiruvannamalai, Vellore, Tirupathur, Krishnagiri, Dharmapuri, Salem and Namakkal.