On 20 November 2017, the remnant energy of
Tropical Storm Kirogi led to the formation of a new low-pressure area over the
Gulf of Thailand.
 Over the next several days, the system moved into the
Bay of Bengal and slowly drifted westwards, but the storm was unable to organize significantly due to unfavorable conditions.
 On 29 November, the storm organized into depression just off the southeastern coast of
Sri Lanka, and the
India Meteorological Department gave the storm the identifier BOB 07.
 Due to the storm's rapidly consolidating
low level circulation center, the
Joint Typhoon Warning Center issued a
Tropical Cyclone Formation Alert on the system, shortly before classifying it as Tropical Cyclone 03B on 29 November.
 The IMD followed suit, upgrading the storm to a Deep Depression, and soon afterwards to Cyclonic Storm Ockhi. The storm tracked along Sri Lanka's southwestern and western coastline, towards the west-northwest, around the southern verge of a subtropical ridge located over
 Owing to highly favorable conditions, the storm displayed a thick
convective ring, surrounding a well-defined eye feature on the same day.
 The storm tracked westwards and intensified further into a Severe Cyclone Storm, early on 1 December.
 Soon afterwards, Ockhi intensified further into a Very Severe Cyclonic Storm.
Cyclone Ockhi rapidly undergoing extratropical transition off the southwest coast of Gujarat.
As Ockhi moved further into the Arabian Sea, it travel through an area of
sea surface temperatures of 31° C (89° F) and decreasing wind shear; a 23 mi (37 km) eye became visible on satellite imagery, prompting the
JTWC to upgrade it to a
Category 3-equivalent cyclone early on 2 December.
 On 4 December, analysis showed that Ockhi was maintaining a source aloft, but there was restricted outflow on the western edge, due to a deepening trough advancing rapidly from the west.
 Increasing vertical wind shear along with a deep layered subtropical ridge to the east steered it to north-northeast, and dry air intrusion from the west gradually weakened the system.
 On the following day, the storm quickly became disorganized as it encountered increasingly unfavorable conditions, including high wind shear. As Ockhi became embedded within a deep mid-latitude trough, the storm rapidly underwent an
 Dry and cold air from the subcontinent rapidly weakened the storm, and it was last noted as a well-marked low-pressure area over the
Gulf of Cambay on 6 December.