India, Nov. 22 -- This season's first cyclonic storm will cross Tamil Nadu and Puducherry coasts between Karaikal and Mahabalipuram around November 25 afternoon.

Under its influence, heavy rainfall activity will increase over south peninsular India November 23 onwards with widespread rain and thunderstorm activity over Tamil Nadu, Puducherry and Karaikal between November 24 and 26 and over south Coastal Andhra Pradesh, Rayalaseema and Telangana during November 25 and 26.

The low-pressure area over southwest and adjoining southeast Bay of Bengal has become a well-marked low-pressure area. It is very likely to concentrate into a depression over southwest Bay of Bengal during next 24 hours and intensify further into a cyclonic storm during...