2023 North Indian Ocean cyclone season

2023 North Indian Ocean cyclone season
2023 North Indian Ocean cyclone season
	Season summary map
Seasonal boundaries
First system formed	30 January 2023
Last system dissipated	6 December 2023
Strongest storm
Name	Mocha
• Maximum winds	215 km/h (130 mph); (3-minute sustained)
• Lowest pressure	938 hPa (mbar)
Seasonal statistics
Depressions	9, 1 unofficial
Deep depressions	7, 1 unofficial
Cyclonic storms	6, 1 unofficial
Severe cyclonic storms	5
Very severe cyclonic storms	4
Extremely severe cyclonic storms	3 (record high, tied with 1999 and 2019)
Total fatalities	523 total
Total damage	$3.21 billion (2023 USD)
Related articles
	2023 Atlantic hurricane season; 2023 Pacific hurricane season; 2023 Pacific typhoon season;
	North Indian Ocean tropical cyclone seasons; 2021, 2022, 2023, 2024, 2025

The 2023 North Indian Ocean cyclone season was an above-average and deadly season, becoming the deadliest season since 2017, mainly due to Cyclone Mocha. With nine depressions and six cyclonic storms forming, it became the most active season, featuring the second-highest accumulated cyclone energy (ACE) on record only behind 2019.^[1] It also had the most extremely severe cyclonic storms on record, tieing with 1999 and 2019. The North Indian Ocean cyclone season has no official bounds, but cyclones tend to form between April and December, with the peak from May to November. These dates conventionally delimit the period of each year when most tropical cyclones form in the northern Indian Ocean. However, a cyclone can form at any time during the year shown by an unnamed depression that affected Sri Lanka in January-February.

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.

The official Regional Specialized Meteorological Centre in this basin is the India Meteorological Department (IMD), while the Joint Typhoon Warning Center releases unofficial advisories for interest. On average, three to four cyclonic storms form in this basin every season.^[2]

^ "Climatology of Tropical Cyclones over North Indian Ocean (NIO)" (PDF). severeweather.wmo.int. 8 December 2022. Archived (PDF) from the original on 6 March 2023. Retrieved 8 December 2022.
^ "Annual Frequency of Cyclonic Disturbances (Maximum Wind Speed of 17 Knots or More), Cyclones (34 Knots or More) and Severe Cyclones (48 Knots or More) Over the Bay of Bengal (BOB), Arabian Sea (AS) and Land Surface of India" (PDF). India Meteorological Department. Archived (PDF) from the original on 15 December 2017. Retrieved 30 October 2015.

[1] "Climatology of Tropical Cyclones over North Indian Ocean (NIO)" (PDF). severeweather.wmo.int. 8 December 2022. Archived (PDF) from the original on 6 March 2023. Retrieved 8 December 2022.

[2] "Annual Frequency of Cyclonic Disturbances (Maximum Wind Speed of 17 Knots or More), Cyclones (34 Knots or More) and Severe Cyclones (48 Knots or More) Over the Bay of Bengal (BOB), Arabian Sea (AS) and Land Surface of India" (PDF). India Meteorological Department. Archived (PDF) from the original on 15 December 2017. Retrieved 30 October 2015.

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