Pre-monsoon activity has set in slightly earlier than usual across South India this year. The most significant impact is being observed in Kerala, where intermittent showers have been affecting coastal areas, leading to a noticeable rise in humidity. In contrast, Tamil Nadu has experienced only light and scattered rainfall over its southern coastal and interior regions, while the northern coastal belt remains largely dry. The primary reason behind this weather development is a north-south wind discontinuity formed over the southern peninsula. This feature develops due to the temperature contrast between coastal zones and the hotter interior regions. When sufficient heat and moisture are present in the atmosphere, this instability triggers pre-monsoon thundershowers, enhancing overall weather activity. The system currently extends from Vidarbha down to the southern tip of the peninsula, passing through interior parts of Karnataka, Rayalaseema, and the Kerala�Tamil Nadu border areas. Additionally, a weak low-level circulation over the southeast Arabian Sea is providing added support to rainfall over Kerala. In the coming days, especially after the first week of March, rainfall activity may become more organized and widespread. However, for now, the primary impact is expected to remain largely confined to Kerala.