This year Northeast monsoon has not disappointed Tamil Nadu. Tamil Nadu has received normal rainfall until now. Between October 1 and December 15, Tamil Nadu has received 5% surplus rainfall that is 434.1 mm rainfall against the normal of 412.4 mm.
The cyclone Nivar and Burevi were the main contributors of rainfall over Tamil Nadu. Cyclone Nivar made landfall over Tamil Nadu coast on November 27 and had given intense rain and thunder our activities over coastal districts of Tamil Nadu including Chennai. Cyclone Burevi made landfall over Sri Lanka coast on December 2nd. But rain activities commenced over coastal areas of Tamil Nadu from December 2nd and continued until December 7. Cyclone Burevei degenerated into to Gulf of Mannar.
Now a cyclonic circulation is over the South-Central Bay of Bengal and a trough is extending up to south coast of Tamil Nadu. Due to the strengthening of easterly wave and the effect of the trough, moderate to heavy rain and thundershower activities are expected to commence over coastal districts of Tamil Nadu by December 16 and may continue until December 19. On December 16 and 17th, rains may be intense over entire Tamil Nadu coast. By December 18th, rain activities will be more intense over Southern districts of the Tamil Nadu. This may be the last heavy spell of rain over Tamil Nadu during this Northeast monsoon season.