Rainfall is likely to strengthen over Kerala in the week ahead under the influence of a north-south trough and a cyclonic circulation that persists over south-central Bay of Bengal, the India Meteorological Department (IMD) indicated on Saturday.
Several districts have been put on yellow and orange alerts for isolated heavy to very heavy rainfall from Sunday to Wednesday, as per a weather update.
The north-south trough runs from north interior Karnataka to the Comorin area across southern Karnataka and Tamil Nadu at lower tropospheric levels. It is likely to persist till Sunday. A cyclonic circulation lies over south-central Bay of Bengal above mean sea level. It was likely to move westward towards the peninsular coast of India over next five days, the IMD said.