Bay of Bengal vs Arabian Sea: Why the Bay Gets More Cyclones

Two Seas, Two Personalities

India's coast faces two very different bodies of water. The Bay of Bengal on the east is a busy cyclone nursery. The Arabian Sea on the west has fewer storms, but some of its recent ones have been among the strongest ever recorded there. Over the long term, the Bay of Bengal produces several times more cyclones than the Arabian Sea, a ratio often quoted as roughly four to one.

Why the Bay of Bengal Is Busier

• Warm, shallow water. Big rivers such as the Ganga, Brahmaputra and Irrawaddy pour fresh water into the Bay. That light water sits on top and helps keep the surface warm, which is fuel for a storm.
• A steady supply of seeds. Low-pressure systems form over the Bay throughout the season, some of them drifting in from the western Pacific. Each one is a chance to grow into a cyclone.
• A funnel-shaped coast. The northern Bay narrows toward Odisha, West Bengal and Bangladesh. The shallow, gently sloping seabed there lets the sea pile up as a storm surge, which is why Bay of Bengal cyclones can be so deadly.

Why the Arabian Sea Is Quieter

The Arabian Sea is generally cooler and its air is often drier, and strong winds at different heights can tear a young storm apart. Fewer systems get the chance to organize. But when the conditions do line up, the open, warm water can still produce an intense cyclone.

The Arabian Sea Is Catching Up

Several scientific studies have reported that Arabian Sea cyclones have become more intense in recent decades, as the sea surface has warmed. Two of the strongest examples are in our archive:

• Gonu (2007): a Super Cyclonic Storm with 240 km/h winds that struck Oman.
• Kyarr (2019): matched Gonu's 240 km/h but stayed at sea and never made landfall.

Who Is at Risk Where

Bay of Bengal storms mainly threaten Odisha, Andhra Pradesh, West Bengal, Tamil Nadu, Bangladesh and Myanmar. Arabian Sea storms threaten Gujarat, Maharashtra and the west coast, along with Oman, Pakistan and the Gulf states.

You can filter our archive by basin to compare them yourself.