Kerala The Most Active Pocket Over South India, Week Long Rain-Thundershowers Likely

South Peninsula has recorded excess rains during the pre-monsoon season. Between 01st March and 05th May, the region has a huge surplus of 53% rainfall. The state of Kerala has also achieved an excess rainfall of 35% during this period. More rain is likely during this week, and the rain surplus will mount further.

The rainfall in pre-monsoon over the South Peninsula is largely governed by the semi-permanent seasonal north-south trough across the central parts. The trough oscillates east and west, thereby increasing the span of weather activity. Water bodies on either side of the coastline fuels enough moisture to sustain pre-monsoon thunderstorms.

The Peninsular trough is now stretching from Vidarbha to the southern tip, along the border areas between Tamil Nadu and Kerala. The presence of an anticyclone in the lower levels over the Arabian Sea, off the coast of Karnataka, is fueling moist northwesterly winds along the coastline. Orography is aiding to the convergence of winds and is likely to enhance the convection all along the north-south stretch of the state.

Today, the weather activity will cover both the southern states, Kerala and Tamil Nadu. Tomorrow, the activity will shift largely to Kerala but remain confined to the central and southern parts of the state. For the subsequent three days, between 07th and 09th May, the pre-monsoon showers will stretch along Mallapuram, Thrissur, Kochi, Kottayam, Kollam and Thiruvananthapuram. Later, a fresh surge of streaming northerly winds along the coast will extend the weather activity to the northern half of the state as well. Between 10th and 12th May 2025, along with the other stations of the state, rain and thundershowers will have a large spread covering Kasaragod, Kudlu, Kannur, Wayanad, Thalassery and Kozhikode. The weather activity will start becoming sparse early next week.