Northeast monsoon was vigorous over south Kerala during the 24 hours ending at 8.30 a.m. on Wednesday and the meteorological centre here has forecast rain or thundershowers at many places in the State for at least two more days.
Isolated places in the State will receive heavy rainfall exceeding 7 cm on the gauge on Thursday and Friday, the Thiruvananthapuram Meteorological Centre said in its bulletin on Wednesday.
A depression formed over southwest and adjoining southeast Bay of Bengal early in the morning on Wednesday and the system lay centred over a location some 650 km east-southeast of Chennai at 8.30 a.m.
The system would move westwards initially and then west-northwards and intensify into a deep depression.
It would cross Tamil Nadu coast between Nagapattinam and Chennai by Friday night or Saturday morning, the Chennai Regional Meteorological Centre said in a bulletin.
A cyclonic circulation too was persisting over Lakshadweep and neighbourhood at lower levels of the atmosphere on Wednesday.
During the 24 hours ending at 8.30 a.m. on Wednesday, heavy rainfall occurred in Thiruvananthapuram and Aryankavu (9 cm each); Nedumangad, Neyyattinkara, Kayamkulam, and Piravom (8 cm each) and Chengannur and Kurudamannil (7 cm each).
Punalur and Varkala received 6 cm of rainfall each and Kottayam, Mavelikara, Kayamkulam, and Konni 5 cm each.
Most of the places south of Ernakulam received rainfall and isolated places in Thrissur and Palakkad district also received good showers.
The northeast monsoon has been 16 per cent deficient for the State so far, with the rainfall recorded between October 1 and November 13 coming to only 325 mm against a normal of 385 mm for the period.