Heavy rain forecast for Coimbatore, Nilgiris, Theni, Krishnagiri, Dharmapuri.
Strong winds likely in the same hilly districts.
Moderate rain expected in many other districts like Tiruppur, Erode, Salem.
Chennai may see thunderstorms and lightning.
The biggest rain will fall in the hilly districts such as Coimbatore and the Nilgiris.
Strong winds could blow in those hill regions while other districts get lighter showers.
In Chennai, rain may come with thunder and bright flashes of lightning.
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