Cyclone threat looms over Andhra Pradesh, Odisha coasts

A tropical cyclone is an organized, rotating storm that forms around a low-pressure centre over warm tropical ocean water. It can bring damaging winds, heavy rain, and dangerous seas. The terms in the bulletin describe stages of strengthening, not separate kinds of weather systems. These stages help forecasters communicate risk clearly.

A low-pressure area is a broad region where air pressure is lower than nearby areas. If it becomes more organized, it can be classified as a depression. A deep depression is stronger and more organized than a depression. In the article’s sequence, the system is expected to become a depression, then a deep depression, and possibly a cyclonic storm.

The article gives exact timing for this case. The system could become a depression on Saturday, a deep depression by October 25, and a cyclonic storm on October 26. These classifications matter because increasing strength usually means greater rainfall and wind hazards. The article does not provide formal wind-speed thresholds for each stage.

The developing system is currently a low-pressure area over the southeast Bay of Bengal. This matters because its location places it over an ocean region where it may strengthen while moving toward India’s east coast. The India Meteorological Department is watching its direction and intensity closely.

IMD expects the system to intensify into a depression on Saturday. It is then likely to move west-northwestwards and become a deep depression by October 25. The forecast says it could develop into a cyclonic storm on October 26 and remain over the west-central Bay of Bengal.

After October 26, the system is expected to move toward the north Andhra Pradesh and adjoining south Odisha coast. The article describes this as a possible approach, not a confirmed landfall. Its exact track and strength may therefore remain important uncertainties for coastal communities, rainfall planning, and emergency preparation.

The India Meteorological Department monitors the system and communicates its possible evolution to the public and authorities. Its role matters because a disturbance over the ocean can change strength and direction before reaching the coast. Timely forecasts help people understand when heavy rain or stronger winds may become possible.

In a special bulletin, IMD reported that a low-pressure area had formed over the southeast Bay of Bengal. It forecast likely stages and movement: a depression on Saturday, a deep depression by October 25, and possibly a cyclonic storm on October 26. It also identified the likely coastal approach zone.

IMD issued rainfall forecasts for several states and islands, including warnings of very heavy rain in coastal Odisha and northern Nicobar Islands on October 26 and 27. The agency’s forecasts are not guarantees of landfall. They are changing assessments that provide advance information as the system develops and moves.

The main expected impact is widespread heavy rainfall, with the greatest concern in some coastal areas. This matters because a strengthening system can concentrate moisture and produce intense rain while also affecting winds and coastal conditions. The article specifically highlights Andhra Pradesh, Odisha, the Nicobar Islands, and several southern states.

IMD forecasts continued heavy rainfall until October 27 across Tamil Nadu, coastal Andhra Pradesh, Yanam, Rayalaseema, Kerala, and coastal Karnataka. North Karnataka may receive rain until October 25. As the system strengthens, coastal Odisha and northern parts of the Nicobar Islands could receive very heavy rainfall on October 26 and 27.

The article does not give predicted wind speeds, storm surge heights, flooding totals, or confirmed landfall. It does show a broad rainfall footprint linked to the cyclone’s development and the active Northeast Monsoon. Conditions could become more hazardous if the system moves closer to the coast as forecast.

The North Indian Ocean includes the Bay of Bengal and the Arabian Sea. The article says about four cyclones form there each year on average, with three forming over the Bay of Bengal. This makes the Bay the region’s more frequent cyclone basin and explains why coastal forecasting is especially important there.

The article does not state why the numbers differ. Established meteorology identifies several contributing factors, including the Bay of Bengal’s warm waters, abundant atmospheric moisture, and conditions that can support organised circulation. The Arabian Sea can also produce cyclones, but its conditions are often less consistently favourable.

This article’s specific system could become the first cyclone over the Bay of Bengal in 2026. If it does, Bangladesh’s proposed name is Arnab. The broader pattern means communities around both coasts remain exposed, while Bay of Bengal communities face the region’s more frequent cyclone threat.

The Northeast Monsoon is already active over southern peninsular India when this system develops. That matters because the monsoon can maintain a broad flow of moist air, while the developing cyclone adds stronger uplift and organized circulation. The combination can increase rainfall over areas far beyond the storm’s centre.

In this case, IMD links the system’s development with continued heavy rainfall over Tamil Nadu, coastal Andhra Pradesh, Yanam, Rayalaseema, Kerala, and coastal Karnataka until October 27. North Karnataka is likely to receive rainfall until October 25. The cyclone’s west-northwestward movement may also shift the heaviest rain toward the east coast.

The article does not quantify how much extra rain comes from the cyclone or the monsoon separately. It does show that both weather systems are occurring together. That overlap can lengthen the rainy period and broaden the affected area, even before the possible storm approaches north Andhra Pradesh and south Odisha.

A low-pressure disturbance is a region where air pressure is lower and air can rise. Over a sufficiently warm ocean, evaporation adds moisture to the atmosphere. Rising moist air forms thunderstorms, and the release of heat inside those clouds can strengthen the circulation. Earth’s rotation helps the system develop a spin away from the equator.

For growth to continue, the storm usually needs limited vertical wind shear, meaning winds at different heights should not tear the circulation apart. It also needs continued warm water and a moist environment. These established scientific conditions help explain how a Bay of Bengal disturbance can progress from a low-pressure area to a depression, deep depression, and cyclonic storm.

In this case, IMD expects that progression between Saturday and October 26. The article itself does not measure ocean temperature, moisture, wind shear, or atmospheric heat. Therefore, those physical conditions explain the general mechanism, while IMD’s forecast provides the specific timeline for this system.