2009 North Indian Ocean cyclone season

2009 North Indian Ocean cyclone season
Season summary map
Seasonal boundaries
First system formed	April 14, 2009
Last system dissipated	December 16, 2009
Strongest storm
Name	Aila
• Maximum winds	110 km/h (70 mph) (3-minute sustained)
• Lowest pressure	968 hPa (mbar)
Seasonal statistics
Depressions	8
Deep depressions	6
Cyclonic storms	4
Severe cyclonic storms	1
Total fatalities	419 total
Total damage	$1.3 billion (2009 USD)
Related articles
Timeline of the 2009 North Indian Ocean cyclone season 2009 Atlantic hurricane season 2009 Pacific hurricane season 2009 Pacific typhoon season
North Indian Ocean tropical cyclone seasons 2007, 2008, 2009, 2010, 2011

The 2009 North Indian Ocean cyclone season was an event in the annual cycle of tropical cyclone formation. The North Indian Ocean cyclone season has no official bounds, but cyclones tend to form between April and December, with peaks in May and November. These dates conventionally delimit the period of 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.

The official Regional Specialized Meteorological Centre in this basin is the India Meteorological Department (IMD), while the Joint Typhoon Warning Center releases unofficial advisories. The tropical cyclone scale for this basin is detailed on the right. On average, 4 to 6 storms form in this basin every season.^[1]