Northeast Monsoon Sets In Over Kerala, Triggers Heavy Rainfall

The India Meteorological Department (IMD) has declared the commencement of the Northeast Monsoon over the southern peninsular region, including Kerala, marking the simultaneous withdrawal of the Southwest Monsoon from the country. This seasonal shift has immediately brought widespread and heavy rainfall across Kerala, with the southern and central districts experiencing the most vigorous spells.

The onset of the ‘Thulavarsham’ (as the Northeast Monsoon is locally known) is being influenced by several prevailing weather systems, including an upper air cyclonic circulation over the Comorin area and the establishment of easterly/northeasterly winds over southern peninsular India. These factors are expected to sustain and intensify the rainfall activity in the coming days.

In light of the anticipated downpour, the IMD has issued alerts for various districts. An Orange Alert—warning of very heavy rainfall—has been declared for vulnerable districts like Kottayam and Idukki. Several other districts, including Thiruvananthapuram, Kollam, Pathanamthitta, Alappuzha, Ernakulam, Thrissur, and Malappuram, are under a Yellow Alert, cautioning residents about heavy rain.

Authorities have advised residents, particularly those in low-lying and hilly areas prone to landslides and flash floods, to exercise extreme caution and follow local disaster management advisories. Fishermen have also been warned against venturing into the sea off the Kerala coast due to rough weather conditions.

The Northeast Monsoon, which typically spans from October to December, is a crucial secondary rainy season for Kerala, though its primary impact is felt in Tamil Nadu. The State receives an average of around 492 mm of rainfall during this period. The current vigorous onset suggests a strong start to the season, necessitating continuous vigilance and preparedness across the state.