2011 North Indian Ocean cyclone season

2011 North Indian Ocean cyclone season
Season summary map
Seasonal boundaries
First system formed	February 2, 2011
Last system dissipated	December 31, 2011
Strongest storm
Name	Thane
• Maximum winds	140 km/h (85 mph) (3-minute sustained)
• Lowest pressure	969 hPa (mbar)
Seasonal statistics
Depressions	10
Deep depressions	6
Cyclonic storms	2
Severe cyclonic storms	1
Very severe cyclonic storms	1
Total fatalities	367 total
Total damage	$603 million (2011 USD)
Related articles
2011 Atlantic hurricane season 2011 Pacific hurricane season 2011 Pacific typhoon season
North Indian Ocean tropical cyclone seasons 2009, 2010, 2011, 2012, 2013

The 2011 North Indian Ocean cyclone season was the least active tropical cyclone season in the North Indian Ocean since 1993.^[1] Only two cyclonic storms formed, below the average of four to six. 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.

This season was the first season since 1993 where only two named storms formed. However, the systems that formed would cause damages of greater than $1.64 million USD and cause approximately 360 fatalities. It is believed that La Niña, a quasiperiodic climate pattern which causes a rise in surface pressure over the Indian Ocean, making the region drier, was the main cause for the below-active activity in the basin.^[2]