Yellow alert has been sounded for Thiruvananthapuram, Kollam and Kottayam districts on Tuesday and for Pathanamthitta, Alappuzha, Kottayam and Idukki districts on Wednesday, it said.
“A low pressure area lies over South Andaman Sea and adjoining areas of Southeast Bay of Bengal & Equatorial Indian Ocean. It is very likely to concentrate into a depression during the next 48 hours and likely to intensify further thereafter. It is likely to move nearly westwards and reach south Tamil Nadu coast around December 2,” the IMD said in its website.
Orange alert indicates heavy to very heavy rainfall ranging from 6 cm to 20 cm of rain while yellow alert is heavy rainfall ranging from 6 cm to 11 cm.