Based on the cyclone hit areas that ares often hit by the tropical cyclone formed in Bay of Bengal during Northeast monsoon season. Tamil Nadu is classified into five zones. Namelys Very high, high, medium, low and veiy low cyclone prone zone.
Areas:
Very high zone: Southern part of Chennai, Eastern part of Kanchipuram and Villupuram, North Eastern part of Cuddalore and Union territory of Puduchery.
High zone: Nagapattinam, Thiruvallur, Tiruvarur (except North Western part) Southern part of Tanjavur, Eastern part of Pudukottai, Cuddalore, Tiruvannamalai, North Eastern part of Vellore, Northern part of Chennai, North Western part to Kanchipuram and Middle portion of Villupuram.
