Several parts of southern and eastern India are under a heavy rainfall forecast as a weather system over the Bay of Bengal influences conditions across the region. The India Meteorological Department (IMD) has warned of heavy rain, thunderstorms, lightning and strong winds in parts of Karnataka, Kerala, Tamil Nadu, Telangana, Coastal Andhra Pradesh and the Andaman & Nicobar Islands.
The situation is particularly important for Coastal Andhra Pradesh and Telangana, where the IMD is forecasting continued rainfall activity over the next few days. Coastal Andhra Pradesh has been placed under warnings for heavy rain on September 21, with very heavy rainfall on September 22 and extremely heavy rainfall on September 23–24.
Heavy Rainfall Forecast: Key Highlights
| State/Region | Weather Outlook |
|---|---|
| Karnataka | Heavy rain, thunderstorms and lightning |
| Kerala | Rain and thunderstorms |
| Tamil Nadu | Heavy rain on Sept. 21 |
| Telangana | Heavy rain through the coming days |
| Coastal Andhra Pradesh | Heavy to extremely heavy rain |
| Andaman & Nicobar | Thunderstorms; earlier heavy/very heavy rain |
| South Odisha | Heavy to very heavy rainfall |
| Bay of Bengal | Strong winds and rough sea conditions |
The forecast is linked to a low-pressure area over the Bay of Bengal and adjoining Andaman Sea, which is expected to influence rainfall over eastern and central India.
Karnataka Weather: Heavy Rain Continues
Karnataka is among the states expected to see significant rainfall activity.
The IMD's September 20 warning covers Coastal Karnataka, North Interior Karnataka and South Interior Karnataka, with heavy rain warnings continuing from September 21 through September 24. Thunderstorms and lightning are also expected.
For Bengaluru and other parts of Karnataka, heavy showers can result in:
- Waterlogging on roads
- Traffic congestion
- Reduced visibility
- Localised flooding
- Lightning-related risks
- Disruption to outdoor activities
Recent heavy rainfall in Bengaluru has already caused waterlogging and traffic disruptions in several areas, highlighting the possibility of localised urban problems during intense showers.
Karnataka Weather Outlook
The current IMD warning indicates that rainfall activity could remain significant across all three Karnataka subdivisions through September 24. Conditions are expected to ease after that, with no warning listed for September 25–26 in the current bulletin.
Kerala Weather: Rain and Thunderstorms
Kerala is also experiencing an active weather spell.
The IMD forecast indicates thunderstorms and lightning on September 21, following a heavy-rain warning for September 20. Another heavy-rain warning is listed for September 24.
Heavy showers could temporarily affect:
- Road travel
- Hill roads
- Low-lying areas
- Agricultural activity
- Outdoor work
People in areas prone to waterlogging or landslides should follow local administration and IMD advisories.
Tamil Nadu Weather: Heavy Rain on September 21
Tamil Nadu and Puducherry are also under a weather warning.
The IMD has issued a heavy-rain warning for September 21, along with the possibility of thunderstorms and lightning. Thunderstorm activity is also expected on September 22.
The coastal areas could see particularly unsettled conditions, with the IMD's coastal bulletin reporting scattered rain and thunderstorms with isolated heavy falls along parts of the Tamil Nadu coast.
People travelling along coastal areas should remain alert to changing weather conditions.
Telangana Weather: Heavy Rain Forecast
Telangana is another major focus area in the current weather system.
The IMD has forecast heavy rain on September 21 and September 22, with heavy-rain warnings continuing through September 25 in its latest subdivision bulletin.
Thunderstorms, lightning and strong winds could accompany rainfall in parts of the state.
This could affect:
- Road traffic
- Agriculture
- Local transport
- Outdoor activities
- Low-lying locations
Residents should take extra care during thunderstorms and avoid exposed areas during lightning activity.
Coastal Andhra Pradesh Faces Strongest Rainfall Risk
Among the listed regions, Coastal Andhra Pradesh has one of the more significant rainfall outlooks.
According to the IMD:
- September 21: Heavy rain
- September 22: Very heavy rain
- September 23: Extremely heavy rain
- September 24: Extremely heavy rain
Thunderstorms, lightning and strong surface winds are also forecast during this period.
A low-pressure system over the Bay of Bengal is expected to intensify and influence rainfall over north Coastal Andhra Pradesh and neighbouring regions.
Why Coastal Andhra Needs Attention
Heavy rainfall over a short period can increase the risk of:
- Waterlogging
- Localised flooding
- Road disruptions
- Strong winds
- Damage to vulnerable structures
- Agricultural losses
The IMD has also warned of strong winds over parts of the Bay of Bengal, with winds potentially reaching 55–65 kmph and gusting to 75 kmph over some areas.
Andaman & Nicobar Islands Weather Update
The Andaman & Nicobar Islands are also experiencing unsettled weather.
The IMD's Port Blair warning bulletin recorded very heavy rainfall on September 19, followed by heavy rain on September 20 and thunderstorm/lightning warnings from September 21 onward.
The islands are located close to the weather system developing over the Bay of Bengal, making them important to monitor as the system evolves.
Why Is Rainfall Increasing Across Southern India?
The current weather activity is associated with a low-pressure area over the Bay of Bengal and adjoining Andaman Sea.
The system is expected to move and intensify, influencing rainfall over parts of:
- Andhra Pradesh
- Telangana
- Odisha
- Chhattisgarh
- Vidarbha
- Other neighbouring regions
The system is also accompanied by thunderstorms, lightning and strong winds in several areas.
This weather setup is producing widespread rainfall activity across parts of southern, eastern and central India.
Impact on Agriculture
Rainfall at this stage of the season can have mixed effects.
Adequate rainfall can support water availability and crops, particularly where rainfall has been below normal. However, very heavy rain over a short period can damage standing crops, cause soil erosion and create waterlogging.
Farmers should follow local agricultural advisories, especially in areas under very heavy or extremely heavy rainfall warnings.
State-Wise Rainfall Outlook
| State/Region | Main Concern |
|---|---|
| Karnataka | Heavy rain and thunderstorms through Sept. 24 |
| Kerala | Thunderstorms on Sept. 21; additional rain later |
| Tamil Nadu | Heavy rain Sept. 21 |
| Telangana | Heavy rain through Sept. 25 |
| Coastal Andhra Pradesh | Heavy to extremely heavy rain Sept. 21–24 |
| Andaman & Nicobar | Thunderstorm activity and unsettled weather |
| South Odisha | Heavy to very heavy rainfall |
Forecasts can change as the weather system develops, so residents should check the latest IMD bulletin for their district.
Frequently Asked Questions
1. Which states are under the latest heavy rainfall forecast?
Karnataka, Kerala, Tamil Nadu, Telangana and Coastal Andhra Pradesh are among the southern regions facing significant rainfall activity, while the Andaman & Nicobar Islands are also under weather warnings.
2. Which area faces the strongest rainfall warning?
Coastal Andhra Pradesh has a particularly strong outlook, with extremely heavy rainfall forecast for September 23 and 24.
3. Will Karnataka receive heavy rain?
Yes. IMD has issued heavy-rain warnings for Coastal, North Interior and South Interior Karnataka through September 24.
4. Is Bengaluru likely to receive rain?
Bengaluru is within Karnataka's current active rainfall period, although rainfall intensity can vary considerably by locality.
5. What is causing the rainfall?
A low-pressure area over the Bay of Bengal and adjoining Andaman Sea is influencing weather across parts of southern, eastern and central India.
6. Will Tamil Nadu receive heavy rain?
Yes. IMD has issued a heavy-rain warning for Tamil Nadu and Puducherry on September 21.
7. Is Telangana under a rain alert?
Yes. IMD's latest warning shows heavy rain continuing in Telangana through September 25.
8. Is Kerala under a weather warning?
Kerala has a thunderstorm and lightning warning for September 21, with additional heavy-rain activity forecast later in the period.
9. Is there a cyclone warning?
The current reports describe a low-pressure system, not a confirmed cyclone warning for these regions. The system's development and movement are being monitored.
10. Can heavy rain cause flooding?
Yes. Intense rainfall over a short period can cause waterlogging and localised flooding, particularly in low-lying and urban areas.
11. Is it safe to travel during thunderstorms?
Travel should be undertaken carefully during severe weather. People should avoid flooded roads and follow local traffic and weather advisories.
12. What should fishermen do?
Fishermen should follow the latest IMD marine warnings and avoid entering areas where rough or very rough sea conditions are forecast.
Published on : 21st September
Published by : SMITA
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