A new low-pressure area is likely to form in the Bay of Bengal today. The Chennai Meteorological Department has issued an orange alert for very heavy rain in Coimbatore and Nilgiris districts today and tomorrow. Similarly, there is a possibility of heavy rain in Tiruppur, Dindigul, Theni, Tenkasi, Nellai and Kumari districts, and light to moderate rain with thunder and lightning at a few places i