Cyclonic circulation is coming up over South Andaman Sea shortly. Heavy rain and thundershowers are expected over Bay Islands. Squally winds and rough sea conditions will prevail between 26thFeb and 01stMar. The weather system will travel across the entire length of Bay of Bengal, reaching Tamil Nadu coast later around next mid week.
Well marked cyclonic circulation is entering South Andaman Sea from the Gulf of Thailand. Currently, this feature is marked over the Gulf and adjoining Bilauktaung range located in the border areas of Myanmar and Thailand. Circulation will move further eastward, in the close proximity of Malay Peninsula and Strait of Malacca. It is likely to come up over South Andaman basin and southeast Bay of Bengal on 27thFeb.
Heavy to very heavy rain and thundershowers are expected to lash the Andaman Sea, more in the southern half than the northern one. Inclement weather conditions are likely over Car Nicobar, Maya Bandar, Nancowrie and Port Blair on 27th and 28thFeb. Weather belt will shift further over central region of South Bay of Bengal on 01stMar.
This cyclonic circulation is not likely to develop in to a low pressure area. However, it will be strong enough to reach Tamil Nadu coast 0n 02ndMar to commence the pre monsoon activity over the state. To start with, South Coastal Tamil Nadu will get the impact on 02nd Mar and later the interiors also fall under its influence on 03rd and 04thMar. Southern half of the state will face more fury than the north. The intensity of weather will decrease on 05thMar and find clearance the next day.