Record-breaking costs were incurred during the 2025 North Indian Ocean cyclone period

Nature · Published 20 October 2026 · Updated 21 October 2026 Swipe more like this →

In short: A season of unprecedented destruction, the 2025 North Indian Ocean cyclone cycle shattered records for economic loss and human tragedy. From the first-ever cyclone in the Strait of Malacca to rare blizzards in the Himalayas, these storms demonstrated the volatile power of the Arabian Sea and the Bay of Bengal.

The 2025 season was defined by extreme lethality and economic impact, becoming the deadliest since 2008. Cyclone Senyar became a historical milestone by being the initial documented storm to originate within the Strait of Malacca. Senyar caused devastating floods across Indonesia, Thailand, and Malaysia, claiming over 1,501 lives. Another major disaster was Cyclone Ditwah, which meandered near Sri Lanka in November 2025, resulting in 647 deaths in that country alone.

The basin's activity was characterized by an above-average number of depressions and a standard amount of cyclonic storms. While cyclones typically peak between May and November, the 2025 season saw an unusual start, with the first cyclone attaining strength on October 3rd. The meteorological landscape was complex; for instance, Depression BOB 02 over West Bengal regenerated to become LAND 03, despite no recorded evidence of a preceding LAND 02. Similarly, a system emerged as BOB 04 without a recorded BOB 03.

The human and economic toll was staggering. Depression BOB 07 triggered a rare blizzard in Nepal, killing a climber on Mera Peak and causing over $14.4 million USD in infrastructure damage. In India, rainfall from various systems affected millions, including 6.1 million people in India from a single depression in May. In Gujarat, the remnants of Cyclone Shakhti damaged 42 lakh hectares of farmland—roughly 42% of the state's total—prompting a government relief package of approximately $1.0 billion USD.

These events highlight the diverse ways tropical systems manifest. They can transition from maritime depressions to inland systems that interact with rugged terrain, causing flash floods in cities like Kota and Jaipur or causing landslides in the Darjeeling hills. The 2025 season serves as a stark reminder of how rapidly these systems can escalate from low-pressure disturbances into multi-national disasters.

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