[1] Seasons have no official bounds, but cyclones tend to form between April and December, with the peak from May to Early November.

These dates conventionally delimit each year when most tropical cyclones form in the northern Indian Ocean.

The scope of this article is limited to the Indian Ocean in the Northern Hemisphere, east of the Horn of Africa and west of the Malay Peninsula.

There are two main seas in the North Indian Ocean — the Arabian Sea to the west of the Indian subcontinent, abbreviated ARB by the India Meteorological Department (IMD); and the Bay of Bengal to the east, abbreviated BOB by the IMD.

[2] After four months of inactivity, on 21 May, the India Meteorological Department (IMD) began monitoring a cyclonic circulation in the Bay of Bengal.

[3] Later that day, the Joint Typhoon Warning Center (JTWC) would also begin tracking the system, noting that it was likely to become a monsoon depression.

[7] Subsequently, the JTWC issued a Tropical Cyclone Formation Alert (TCFA), noting the depression's broad circulation center and its improving rainbands.

[16] Due to the westward shift of the monsoon trough, the depression formed on land instead of the usual formation in the Bay of Bengal.

Early the next day, on 25 August, the IMD noted that it had developed into a land depression over Rajasthan and Madhya Pradesh.

[20] On 27 August, the JTWC began tracking the deep depression, noting that it was in a marginal environment for development.

[27] On 1 September, Asna was stripped of any convection due to dry air entrainment and degenerated to a remnant low.

Two days later, early on 31 August, the IMD upgraded it into a depression, designated as BOB 03, off the coast of Andhra Pradesh.

On 9 September, the deep depression made landfall in Odisha and weakened back down to a prominent low pressure system.

Due to heavy rain from this system, seven people were killed by landslides in Cox's Bazar District.

[47] Due to the heavy rains, the Damodar Valley Corporation released more than 3.5 lakh cusec of water from its dams, resulting in inundation of Birbhum, Bankura, Howrah, Hooghly, North and South 24 Parganas, Purba and Paschim Medinipur, and Paschim Bardhaman districts of West Bengal.

On 15 October, it degenerated back to a low pressure due to increased dry air making it more disorganized.

[49] In the wake of this system, heavy rains slashed Puducherry, Chennai and other parts of Andhra Pradesh, bringing these areas to a standstill.

Residential neighbourhoods and roads were inundated with knee-deep water, causing widespread disruptions to daily life.

The relentless downpour led to traffic congestion, crippled public transportation services, and forced the cancellation of several flights.

[59] Further consolidation due to a westerly wind burst led to the formation of a low-pressure area over Southeast Bay of Bengal and a deadly twin cyclone on 23 November.

It intensified further into a depression on 25 November, moving northwestwards towards Tamil Nadu and Sri Lanka coast.

[65] Subsequently, the system emerged over coastal Karnataka and proceeded into the Arabian Sea,[66] and dissipated 2 days later.