The Pre-Monsoon season officially commences from 01st March over South Peninsula and the Bay Islands. There are no strict bounds as such and the weather systems may precede or succeed this date. This season appears to be commencing with punctuality, right on the mark, i.e. 01st March.
The maiden low-pressure area of the season is likely to form anytime soon, possibly within 24 hours over the Bay of Bengal. The weather system will start the Pre-Monsoon activity over the equatorial and neighbouring tropical region of the Bay of Bengal, North Indian Ocean and adjacent Islands and later extend to Sri Lanka and South India.
Presently, a well-marked cyclonic circulation is seen over South Andaman Sea and neighbourhood. Significant cloud cluster is manifesting its likely rapid growth. This weather system is expected to become more prominent, increase its depth and also shift over Southern parts of South Bay and adjoining the southeast Bay of Bengal. It is likely to turn into a low-pressure area very soon and expand its peripheral up to the equatorial region.
South Andaman Sea, covering Car Nicobar and Nancowrie islands are expected to have heavy rains today. Sea conditions will be very rough on account of turbulent water and squally winds. The belt of bad weather will travel westward to reach the Sri Lanka coast on 02nd March. Convective storms are likely to lash the coastline between Malara and Batticaloa.
On 03rdMar, inclement weather will extend further to impact a major portion of the island country. Jaffna, Vavuniya, Anuradhapura, Kandy and Trincomalee will fall in the strike range of the system. Severe thunderstorms with lightning and gusty winds will be witnessed for nearly 24hr. On the subsequent 2-3 days, the activity will continue, but less intense and spread, as well.
Coastal parts of Tamil Nadu will be the next stop for stormy conditions. Pre-monsoon will officially commence with coast and interiors, both experiencing thunderstorms simultaneously, for 3-4 days between 03rd and 06th Mar.