Cyclone likely to form over Bay of Bengal in few days, rain alert for Andhra Pradesh, Odisha: IMD

The low-pressure area over the eastcentral and adjoining southeast Bay of Bengal is expected to intensify in stages. The India Meteorological Department says it could become a depression on October 24, a deep depression on October 25, and a cyclonic storm by the morning of October 26.

This progression depends on the system crossing specific intensity thresholds. The article explains that a depression has maximum sustained winds of 17-27 knots, while a deep depression has 28-33 knots. A cyclonic storm begins at 34 knots, or 63 kmph.

The forecast matters because the strengthening system is expected to move toward the coast. If it reaches cyclonic-storm strength, the next cyclone in the North Indian Ocean naming roster will be called Arnab, a name contributed by Bangladesh.

The weather system is forecast to move west-northwestwards after becoming a cyclonic storm. Its expected path points toward the North Andhra Pradesh and adjoining South Odisha coasts over the following two days.

This direction matters because the system’s movement brings its rain and winds closer to populated coastal areas. The IMD specifically identified coastal Andhra Pradesh and Odisha as areas that could be affected. The article does not provide a precise landfall location.

The forecast also connects the movement with a serious rainfall threat. The IMD projected extremely heavy to heavy rain for coastal Andhra Pradesh and Odisha between October 27 and 29. Officials and residents in these areas therefore face a period of heightened weather risk, although the system’s exact final track may still change.

The India Meteorological Department has issued a rainfall warning for coastal Andhra Pradesh and Odisha. It projects extremely heavy to heavy rainfall between October 27 and 29 as the Bay of Bengal system moves toward the coast.

The wording signals a potentially intense rain event. The article does not give a rainfall total in millimetres, so the forecast describes severity rather than a precise amount. The rain threat follows the system’s expected strengthening into a cyclonic storm by October 26.

This timing gives the regions a defined three-day warning window. The system is forecast to move west-northwestwards toward North Andhra Pradesh and adjoining South Odisha before the rain period. The article does not state exactly how much rain each district will receive or whether the dates will change as the system develops.

Extremely heavy rainfall can overwhelm drainage systems and low-lying areas. For coastal communities, that may mean flooding, waterlogging, unsafe roads, and interruptions to transport, power, or communications. These are established risks of intense rain, not specific impacts reported in this article.

The mechanism is straightforward. When rain falls faster than soil, rivers, and drains can absorb or carry it away, water accumulates. Saturated ground can also become unstable, increasing the risk of landslides in vulnerable areas. Strong winds, if the system becomes a cyclone, could worsen damage, but the article does not describe expected wind impacts.

The IMD forecasts extremely heavy to heavy rain in coastal Andhra Pradesh and Odisha between October 27 and 29. Residents and authorities would need to monitor later warnings closely, because the article does not provide district-level hazard forecasts or confirmed damage.

The IMD classifies these systems by organization and wind intensity. A low-pressure area has one closed isobar. A depression has two, a deep depression has three, and a cyclonic storm has four or more closed isobars.

Wind speed provides the second key distinction. A depression has maximum sustained three-minute winds of 17-27 knots, or 31-50 kmph. A deep depression has 28-33 knots, or 52-61 kmph. At 34 knots, or 63 kmph, the system becomes a cyclonic storm.

This means a low-pressure area does not automatically become a cyclone. It must become more organized and cross the prescribed wind threshold. The Bay of Bengal system is forecast to pass through these stages, potentially reaching cyclonic-storm status by October 26.

The official wind threshold for a cyclonic storm is maximum sustained three-minute surface winds of 34 knots or more. The article converts that threshold to 63 kmph or more. Until the system reaches it remains below cyclonic-storm classification.

The stages immediately before it are weaker. A depression has sustained winds of 17-27 knots, or 31-50 kmph. A deep depression has 28-33 knots, or 52-61 kmph. The jump to 34 knots marks the change to cyclonic-storm status.

The Bay of Bengal system is expected to intensify into a depression on October 24 and a deep depression on October 25. The IMD forecasts it becoming a cyclonic storm over the westcentral Bay of Bengal by the morning of October 26, if it reaches that threshold.

An isobar is a line joining places with the same atmospheric pressure. A closed isobar forms a complete loop around a pressure centre, rather than ending at the edge of a weather map. This helps meteorologists identify a distinct, organized low-pressure system.

The IMD uses the number of closed isobars as one classification measure. The article states that one closed isobar indicates a low-pressure area, two indicate a depression, three indicate a deep depression, and four or more indicate a cyclonic storm. Wind speed is also used over the sea.

Counting these loops helps describe how tightly organized the pressure pattern is. However, closed-isobar count alone does not determine the final category. The system must also meet the relevant maximum sustained wind-speed threshold, so pressure structure and winds work together.