A developing low-pressure system over the West Central Bay of Bengal is expected to bring heavy rain and thunderstorms to southern India, particularly affecting North Andhra and South Odisha, according to the India Meteorological Department (IMD). The weather system is forecast to impact the northwest Bay of Bengal, bringing significant rainfall to multiple regions in the coming days, state owned DD News reported.

Southern states, including Tamil Nadu and Puducherry, are expected to experience varying intensities of rain and thunderstorms as the system progresses. The IMD has issued warnings for isolated heavy rainfall in Krishnagiri, Dharmapuri, and Tirupattur districts. On 25 September, light to moderate rainfall accompanied by thunderstorms and lightning is anticipated across northern Tamil Nadu, with isolated instances in southern parts of the state, Puducherry, and Karaikal. Between 26 and 30 September, rainfall is expected to continue across Tamil Nadu, with strong surface winds of 30-40 km/h likely to affect the region.

The IMD's forecast also points to an increase in temperatures by 2-4°C above average, creating hot and uncomfortable conditions in isolated areas of Tamil Nadu, Puducherry, and Karaikal, due to the combination of elevated temperatures and high humidity. In the capital city of Chennai and its surrounding suburbs, partly cloudy skies are expected in the next 24 hours, with rain forecast in several areas. Temperatures are predicted to peak at 36-37°C during the day and drop to 26-27°C at night. The shear zone, located at approximately 16°N over northern peninsular India, extends from 3.1 km to 7.6 km above mean sea level, further tilting southward with height.

This meteorological phenomenon will likely exacerbate weather conditions in the affected regions, prolonging rainfall activity and increasing the likelihood of thunderstorms. The Indian government’s IMD continues to monitor the evolving situation, advising residents to stay alert to sudden weather changes and heed local warnings.