IMD Predicts Fresh Low Pressure Over Bay of Bengal tomorrow, Rainfall in many Districts of Tamil Nadu

The India Meteorological Department (IMD) has predicted the formation of a new low-pressure area over the southeast and adjoining east-central Bay of Bengal on October 24, potentially intensifying as it tracks west-northwestwards. This development follows the recent weakening of other weather systems near Tamil Nadu, with light to moderate rainfall, thunderstorms, and lightning expected at isolated places in several southern districts. The forecast comes amid the post-monsoon transition, where such systems often bring localised showers critical for agriculture in rain-fed areas.

An upper air cyclonic circulation currently extends up to middle tropospheric levels over the southeast Bay of Bengal and adjoining south Andaman Sea, fuelling the anticipated low-pressure formation. "The system is likely to become more marked during the subsequent 24 hours after formation," the IMD stated in its bulletin. It is projected to move west-northwestwards, though no immediate cyclone intensification has been forecasted. Meanwhile, a depression over the southeast Arabian Sea off the Tamil Nadu coast has weakened and is expected to drift north-northeastwards towards the east-central Arabian Sea. Separately, a low-pressure area over north interior Tamil Nadu and adjoining south interior Karnataka has also dissipated, moving west-northwestwards to emerge over the east-central and southeast Arabian Sea.

Rainfall is likely over the Tirunelveli, Kanyakumari, Tenkasi, Vellore, and Tiruvannamalai districts, as well as the ghat areas of Coimbatore and Tiruppur. These showers, described as light to moderate with possible thunderstorms and lightning, could provide relief from recent dry spells but may disrupt traffic and outdoor activities in hilly terrains. Farmers in these regions, particularly in the southern tip where Kanyakumari and Tirunelveli rely on northeast monsoon rains starting in October, may benefit from the precipitation for crops like paddy and sugarcane.

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The IMD's update underscores the dynamic weather patterns over the Bay of Bengal, which spawns nearly 5-6 depressions or cyclones annually during the post-monsoon season, influencing Tamil Nadu's water resources. Residents in affected districts are advised to stay alert for updates, secure loose objects outdoors, and avoid travel in ghat sections during thunderstorms. No heavy rain or flood warnings have been issued yet, but continuous monitoring will guide any escalation. This system adds to a series of weather events this month, highlighting the region's vulnerability to Bay-derived disturbances.

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