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.

The depression brought isolated rainfall to parts of Sri Lanka, while remaining near stationary before weakening into an area of low pressure early the next day.

On February 2, the IMD upgraded an area of low pressure, located approximately 100 km southeast of Pottuvil, Sri Lanka, to a depression, giving it the designation "BOB 01.

[20] As a result of this and an upper tropospheric cyclonic vortex, an area of low pressure developed on July 21, over the Gangetic West Bengal about 50 km (30 mi) to the southeast of Daltonganj.

[20] During the next day the IMD reported that the low-pressure area had intensified into a land depression, with peak 3-minute sustained windspeeds of 35 km/h (20 mph).

[21] Under the influence of the system, the Indian states of Madhya Pradesh, Rajasthan, Gujarat, Chhattisgarh and Vidarbha saw widespread heavy rainfall, however, no economic damage was reported.

[20] Late on September 20, an area of low pressure developed approximately 200 nautical miles (370 km; 230 mi) south of Chittagong, Bangladesh.

[24] Late on that day, BOB 03 drifted northwest and made landfall over north Orissa close to Balasore.

By the evening of September 23, IMD reported that the depression had weakened into a well-marked low-pressure area in their final bulletin for the system, as the storm dissipated to a remnant low.

[26] As the depression made landfall, heavy rains threatened to cause floods for the second time within two weeks in the Bramhani and Baitarani rivers.

Officials in the hard-hit town of Pakokku believed that the death toll would exceed 300 as residents searched for missing relatives days after the floods.

[42] Under the influence of unfavorable conditions and proximity to land, the system weakened and JTWC issued its final warning.

[45] On November 26, at 11:30 am IST, the IMD upgraded a low-pressure area south of India near Cape Comorin into a depression, giving it the designation ARB 04.

The IMD reported on December 1 that the storm had weakened into a well-marked low-pressure area, and issued the final bulletin for the system.

On December 23, the JTWC reported that a tropical disturbance had developed within the monsoon trough about 1,545 km (960 mi) to the east of Medan in Indonesia.

[53][54][55] The IMD also reported during December 25, that the disturbance had organised sufficiently to be declared Depression BOB 05, while it was located about 1,000 km (620 mi) to the southeast of Chennai, India.

[57][58] As it was named, Thane started to turn towards the west under the influence of a subtropical ridge of high pressure before its development slowed as strong outflow and marginally favourable sea surface temperatures fought with persistent easterly vertical wind shear.

[65] During the rest of that day, the system continued to move westwards and weakened slightly as it started to interact with land.

Thane then made landfall as a very severe cyclonic storm early on December 30 on the north Tamil Nadu coast between Cuddalore and Pondicherry.

[66] Overall, Thane was responsible for the deaths of 46 people with total damage to India, estimated at between 13 – 15 billion rupees (235 – 275 million USD).