Very severe cyclonic storm Arnab: Explained - Why was it named Arnab? How are cyclones named? How naming system works

Cyclone Arnab is a tropical weather system over the Bay of Bengal that intensified into a “very severe cyclonic storm.” It was expected to make landfall along India’s eastern coast on Wednesday, October 18. The classification describes the storm’s strength, not its name, origin, or destination.

The article gives one naming threshold: a system becomes a named cyclonic storm when maximum sustained surface winds reach at least 34 knots, or about 62 kmph. Arnab had strengthened beyond the basic naming stage, but the article does not provide the exact wind-speed range for “very severe cyclonic storm.”

The storm was tracking toward the coastlines of Andhra Pradesh and Odisha. Its classification matters because stronger storms require clearer warnings, evacuation planning, media reporting, and public preparation. The name itself does not reveal how intense the storm is or where it will land.

Cyclone Arnab received its name through the North Indian Ocean’s official naming system. Bangladesh had proposed “Arnab” for the shared list of cyclone names. The name was selected because it was the next available entry, not because Bangladesh was expected to be affected.

The IMD uses names submitted by 13 participating countries in a fixed sequence. The official list translates “Arnab” as “ocean” or “sea” in Bengali. Names must be short, easy to pronounce, and neutral under World Meteorological Organization guidelines. They must not offend religious, political, or cultural communities.

The meaning of a name does not describe a storm’s behaviour. Experts stressed that Arnab’s name says nothing about its intensity, direction, or expected landfall. Although Bangladesh proposed it, the storm was tracking toward India’s Andhra Pradesh and Odisha coastlines.

The official naming threshold in the North Indian Ocean is cyclonic-storm strength. A developing weather system must reach maximum sustained surface winds of at least 34 knots, approximately 62 kmph. This rule prevents every ocean disturbance from receiving a formal name.

The IMD, which serves as the region’s Regional Specialised Meteorological Centre, assigns the name once the threshold is reached. The system can form over the sea without being named immediately. It must first meet the stated wind-speed requirement and be officially classified as a cyclonic storm.

This threshold creates a consistent process across the Bay of Bengal and Arabian Sea. Once a system qualifies, the IMD uses the next name in the approved sequence. Arnab therefore received its name because it reached the required strength, not simply because it developed over the Bay of Bengal.

The India Meteorological Department, based in New Delhi, officially names cyclonic storms in the Bay of Bengal and Arabian Sea. The World Meteorological Organization mandates the IMD as the Regional Specialised Meteorological Centre for the North Indian Ocean region. This gives the naming process one regional authority.

The names come from a pre-approved list prepared by participating countries. Each country submits names under World Meteorological Organization rules. Names must be short, no more than eight letters, easy to pronounce, and neutral toward religious, political, and cultural communities.

The IMD does not choose a name based on a storm’s projected landfall or severity. It assigns the next available name in the established sequence after the system reaches cyclonic-storm strength. Arnab was therefore selected because it was next on the list and had been proposed by Bangladesh.

The North Indian Ocean naming list includes contributions from 13 countries: Bangladesh, India, Iran, Maldives, Myanmar, Oman, Pakistan, Qatar, Saudi Arabia, Sri Lanka, Thailand, the United Arab Emirates, and Yemen. Their shared list supports cyclone warnings across the Bay of Bengal and Arabian Sea.

Each country submitted 13 names, producing a consolidated master list of 169 names. The entries are arranged column by column in alphabetical order by contributing country. The IMD then uses them in strict sequence, choosing the next available entry when a system reaches the official naming threshold.

The process is designed to stay predictable and clear. Under the system described by the IMD, a name is permanently removed after use. Unlike the Atlantic system described in the article, the North Indian Ocean list does not recycle names after a storm has passed.

A country’s contribution of a cyclone name does not indicate where that cyclone will travel. The IMD selects names from a shared regional list, and the next entry is used when a system reaches cyclonic-storm strength. The name therefore identifies the storm for communication, not its destination.

Bangladesh proposed “Arnab,” but the article states that Arnab was simply the next available name. The storm was tracking toward India’s Andhra Pradesh and Odisha coastlines. Its projected path was separate from the country that supplied the name.

This distinction prevents a common misunderstanding during cyclone warnings. Names make alerts easier to issue and understand, but they do not communicate intensity, direction, or landfall location. Forecasts and tracking information provide those details. Arnab’s example shows why a Bangladeshi name did not mean Bangladesh would be hit.

A tropical cyclone is a large, organized storm with a rotating circulation around a low-pressure centre. It develops over warm tropical or subtropical ocean water, where heat and moisture provide energy. The article focuses on naming and classification, not on the physical formation process.

In established meteorological science, warm seawater drives evaporation. Moist air rises and cools, forming clouds and thunderstorms. Condensation releases heat, which helps more air rise and lowers pressure near the surface. Air then flows inward, while Earth’s rotation helps organize the circulation into a rotating system. Ocean heat and moisture can strengthen it.

The article states that forming over the sea alone does not earn a name. The system must reach sustained winds of at least 34 knots, about 62 kmph. Once it does, the IMD assigns the next name on the regional list and warnings become easier to communicate.