Fresh Bay of Bengal System Triggers Heavy Rain Alert Across Southern States

A developing low-pressure system over the southwest Bay of Bengal is set to bring heavy rainfall to southern states until October 26, while northern India experiences an early chill.

A fresh low-pressure area is likely to form over the southwest Bay of Bengal and adjoining parts of the Tamil Nadu coast within the next 24 hours. The India Meteorological Department has projected an active spell of wet weather across several southern regions, driven by this developing weather disturbance. Coastal and interior sectors across peninsular India are slated to witness intensified rain activity along with convective weather over the coming days.

Widespread Downpours Projected Across Southern States
According to official projections, heavy to very heavy rainfall is anticipated across Tamil Nadu, Puducherry, and Karaikal through October 26. In addition, isolated intense spells are expected across Kerala, Mahe, Lakshadweep, Karnataka, coastal Andhra Pradesh, and Rayalaseema. Forecasters note that numerous locations will experience significant precipitation through October 22, with certain areas facing extremely heavy showers. The wet pattern will likely persist in scattered pockets between October 23 and October 26.

Thunderstorms and Rain Forecast for Island Territories
The weather advisory highlights that the southern belt will face gusty winds, frequent lightning strikes, and thunderstorm activity alongside the downpours. Concurrently, the Andaman and Nicobar Islands are expected to observe widespread rainfall activity from October 21 to October 26, which may influence coastal operations and maritime movements.

Gradual Temperature Drop Across Northern and Eastern India
In stark contrast to the south, the spell of rains has completely halted across north and east India, paving the way for the seasonal onset of autumn chill. Night and early morning temperatures have noticeably dropped across Punjab, Haryana, Delhi-NCR, Uttar Pradesh, Bihar, and Jharkhand, marking a clear transition toward cooler conditions as dry weather prevails.

What this means for you
This weather shift will likely cause travel disruptions and localized waterlogging in southern regions while signaling an early shift toward colder mornings in northern states.

• Across South India: Heavy showers and lightning alerts are expected to slow down daily transit and urban commuting. Residents in low-lying parts of Tamil Nadu and neighboring states should prepare for waterlogging risks through October 26.
• Across North and East India: The cessation of rainfall has pulled down minimum temperatures during early mornings and late evenings. Commuters and vulnerable groups should take precautions against seasonal colds as dry and chilly conditions settle in.
• For Coastal and Island Communities: Strong surface winds and rough seas are anticipated around the Andaman and Nicobar Islands and Tamil Nadu shores. Marine operators and shoreline residents must heed official warnings regarding offshore movements.
• For Agricultural Operations: Southern farmers should ensure adequate drainage channels to protect crops from intense rain surges. Conversely, northern growers can utilize the dry weather window to advance field preparations for winter crops.

Why this happened
The contrasting weather conditions across India are driven by developing cyclonic patterns over the Bay of Bengal alongside post-monsoon wind transitions in the northern plains.

• Low-Pressure Development: A low-pressure system is solidifying over the southwest Bay of Bengal adjacent to Tamil Nadu. This system pulls significant oceanic moisture directly inland across the peninsular landmass.
• Seasonal Wind Transition: Late October routinely witnesses heightened convective instability across southern India, fostering intense rainbands. This atmospheric configuration sustains downpours through October 26.
• Dry Continental Airflow in the North: The withdrawal of monsoon moisture has cleared skies across north and east India. Clear nighttime skies combined with dry northwesterly winds have triggered steady radiational cooling and dropping night temperatures.

Questions & Answers

1. What weather system is developing in the Bay of Bengal?
A low-pressure area is expected to form over the southwest Bay of Bengal and the adjoining Tamil Nadu coastline within 24 hours.

2. Which southern states have received heavy rain alerts?
Tamil Nadu, Puducherry, Karaikal, Kerala, Mahe, Lakshadweep, Karnataka, coastal Andhra Pradesh, and Rayalaseema face heavy rainfall alerts.

3. How long will the downpours continue in Tamil Nadu and Puducherry?
The weather department projects heavy to very heavy rainfall spells across these regions through October 26.

4. What is the forecast for the Andaman and Nicobar Islands?
Widespread rainfall activity is predicted across the Andaman and Nicobar Islands from October 21 to October 26.

5. What changes are occurring in the weather across northern and eastern India?
Rainfall has halted in states like UP, Bihar, and Delhi-NCR, leading to falling temperatures and the arrival of autumn chill.

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