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Bay of Bengal Low-Pressure Alert 2026: A developing weather system over the Bay of Bengal is set to influence weather conditions across West Bengal over the coming days, with rain, thunderstorms and gusty winds expected in several areas. The India Meteorological Department (IMD) has forecast a spell of unsettled weather across southern West Bengal from September 22 onward.
According to the weather information shown in the supplied graphic, the coastal districts of South Bengal could experience stronger winds and heavy rain between September 22 and September 25. The graphic also advises fishermen not to venture into the sea during this period and urges people to remain indoors during lightning.
The latest IMD forecast broadly supports the possibility of worsening weather during this period, although the exact intensity and location of rainfall can change as the system develops.
Bay of Bengal Low-Pressure Alert: Low-pressure system over the Bay of Bengal
The weather disturbance is associated with a low-pressure system over the Bay of Bengal. According to recent reports citing the IMD, the system is expected to move west-northwestward and strengthen as it travels towards the north Andhra Pradesh and south Odisha coast.
This system is also expected to increase rainfall activity over parts of eastern India. Odisha is facing particularly strong warnings, with the IMD forecasting very heavy to extremely heavy rainfall in the state during September 22-25.
Rain and thunderstorms likely in South Bengal
For South Bengal, the IMD’s September 21 subdivision forecast lists thunderstorms, lightning and squally conditions for September 22, followed by heavy rain and thunderstorms on September 23 and 24. A very heavy rain warning is listed for September 25.
This means residents in southern districts should be prepared for rapidly changing weather, particularly during thunderstorms.
Kolkata is also expected to remain cloudy with spells of rain or thundershowers. The IMD’s Kolkata-Alipore forecast indicates thunderstorms accompanied by lightning and gusty winds of around 30-40 kmph on September 21-25.
Coastal districts need extra caution
The supplied weather bulletin highlights the possibility of strong winds and heavy rainfall in coastal areas of South Bengal from September 22 to 25.
People living in coastal and low-lying areas should keep an eye on official weather updates, particularly if rainfall becomes persistent. Localised waterlogging, difficult road conditions and disruptions to outdoor activities are possible during periods of heavy rain.
The exact areas receiving the heaviest rainfall can change as the weather system evolves, so residents should rely on the latest IMD district-level warnings rather than forecasts issued several days earlier.
Bay of Bengal Low-Pressure Alert: Fishermen advised not to venture into the sea
One of the key messages in the supplied bulletin is for fishermen.
Fishermen have been advised not to venture into the sea from September 21 to 25.
This is particularly important because the combination of a developing low-pressure system, strong winds and rough sea conditions can create hazardous conditions for small fishing boats.
Thunderstorm and lightning precautions
During thunderstorms, residents should take basic safety precautions.
- Stay indoors during lightning and squally weather.
- Avoid standing under isolated trees.
- Stay away from open fields and exposed rooftops.
- Avoid unnecessary travel during intense thunderstorms.
- Keep electrical appliances protected where possible.
- Follow local administration and IMD advisories.
- Fishermen should follow official restrictions on sea-going activities.
The supplied graphic specifically advises people to remain inside their homes during lightning.
What the forecast says for Kolkata
For Kolkata-Alipore, the IMD forecast issued on September 20 indicated thunderstorms with rain on September 21, followed by cloudy conditions and rain or thundershowers through September 25. Gusty winds accompanying thunderstorms were also indicated.
So, for Kolkata and surrounding areas, residents should be prepared for a wet and stormy spell rather than continuous rainfall throughout the day. Weather conditions can vary significantly between different parts of the city and neighbouring districts.
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Bay of Bengal Low-Pressure Alert: Weather forecast at a glance
| Date | Expected conditions |
| September 21 | Thunderstorm, rain and gusty winds |
| September 22 | Thunderstorms/lightning and squally weather |
| September 23 | Heavy rain with thunderstorms |
| September 24 | Heavy rain with thunderstorms |
| September 25 | Very heavy rain possible in parts of South Bengal |
| September 26 onward | Rain/thunderstorm activity may continue in some areas |
The IMD forecast is subject to change as the system develops.
Stay alert as the system develops
The weather situation is being closely monitored because the Bay of Bengal system is expected to strengthen as it moves west-northwestward. Recent IMD-linked reports indicate that the system could become a deep depression before approaching the north Andhra Pradesh-south Odisha coast.
For West Bengal, the immediate concern is increased rainfall, thunderstorms and gusty winds, particularly across South Bengal and coastal areas.
Residents are advised to check the latest IMD warnings and local administration updates before making plans, especially for travel, outdoor work and activities near rivers or the sea.
