1986–87 South Pacific cyclone season

Category 2 tropical cyclone (Australian scale)
Tropical storm (SSHWS)
Duration	November 20 – November 25
Peak intensity	100 km/h (65 mph) (10-min)  980 hPa (mbar)

Tropical Cyclone Osea formed about 565 km (350 mi) to the north-northeast of Port Vila on 21 November. It moved on a southerly track parallel to Vanuatu and spent most of its time over the sea. No significant damage was reported.

Category 2 tropical cyclone (Australian scale)
Tropical storm (SSHWS)
Duration	December 12 – December 22
Peak intensity	100 km/h (65 mph) (10-min)  975 hPa (mbar)

On December 12, TCWC Nadi started to monitor a tropical depression that had developed about 1,000 km (620 mi) to the north-northwest of Suva, Fiji.

The system affected Northern Vanuatu but caused little or no damage to the island nation.[3]

Category 3 severe tropical cyclone (Australian scale)
Category 2 tropical cyclone (SSHWS)
Duration	December 21 – January 5
Peak intensity	150 km/h (90 mph) (10-min)  955 hPa (mbar)

Cyclone Raja existed from December 21, 1986, to January 5, 1987.

Category 3 severe tropical cyclone (Australian scale)
Category 1 tropical cyclone (SSHWS)
Duration	December 26 – January 6
Peak intensity	150 km/h (90 mph) (10-min)  955 hPa (mbar)

Cyclone Sally existed from December 26, 1986, to January 6, 1987.

Category 3 severe tropical cyclone (Australian scale)
Category 3 tropical cyclone (SSHWS)
Duration	January 13 – January 25
Peak intensity	150 km/h (90 mph) (10-min)  955 hPa (mbar)

On January 13, TCWC Nadi started to monitor a tropical depression that had developed, within a trough of low pressure near the island nation of Tuvalu.[4] Over the next few days the system gradually developed further before it was named Tusi during January 16, after it had become equivalent to a modern-day category 1 tropical cyclone on the Australian tropical cyclone intensity scale. After being named the system gradually intensified as it moved southeastwards along the trough, between the islands of Fakaofo and Swains during January 17. Tusi's eye subsequently passed near or over American Samoa's Manu'a Islands early the next day, as the system peaked in intensity with 10-minute sustained wind speeds of 150 km/h (90 mph). The system subsequently posed a threat to the Southern Cook Islands, however this threat gradually diminished as Tusi moved southwards and approached 25S on January 20.

Category 4 severe tropical cyclone (Australian scale)
Category 1 tropical cyclone (SSHWS)
Duration	February 4 – February 10
Peak intensity	165 km/h (105 mph) (10-min)  940 hPa (mbar)

Cyclone Uma existed from February 4 to February 10.

Category 1 tropical cyclone (Australian scale)
Tropical storm (SSHWS)
Duration	February 7 – February 9
Peak intensity	85 km/h (50 mph) (10-min)  987 hPa (mbar)

The precursor tropical low to Cyclone Veli formed within the Australian region on February 5, about 725 km (450 mi) to the south-east of Port Moresby in Papua New Guinea.[5] During the next day the low moved eastwards and gradually developed further, before it became equivalent to a category 1 tropical cyclone on the Australian scale, as it reached its 10-minute sustained wind speeds of 85 km/h (55 mph).[5] As the system continued to move eastwards it crossed 160°E and moved into the South Pacific basin during February 7, before the FMS named it Veli later that day on the basis of satellite derived evidence.[5][6] During that day the system continued to move eastwards, before as it passed near to Espitru Santo, Veli started to move steadily towards the south-east.[6] Early the next day the JTWC initiated advisories and started to monitor Veli as Tropical Cyclone 16P, with peak 1-minute sustained windspeeds of 45 km/h (30 mph).[7][8] During that day strong upper level north-westerlies caused vertical windshear to increase over Cyclones Veli and Uma and thus weakened them.[6] During February 9, Cyclone Veli absorbed Uma and formed a complex low, which moved slowly south-eastwards and became extratropical.[6] Damage within Vanautu was either minimal or went unreported, as the island nation was more concerned with the aftermath of Cyclone Uma.[9]

Category 3 severe tropical cyclone (Australian scale)
Category 1 tropical cyclone (SSHWS)
Duration	February 27 – March 7
Peak intensity	130 km/h (80 mph) (10-min)  965 hPa (mbar)

Cyclone Wini existed from February 27 to March 7.

Category 3 severe tropical cyclone (Australian scale)
Category 1 tropical cyclone (SSHWS)
Duration	March 5 – March 11
Peak intensity	120 km/h (75 mph) (10-min)  970 hPa (mbar)

A shallow tropical depression developed within a monsoon trough of low pressure on March 5, about 485 km (300 mi) to the southeast of Honiara, on the Solomon Island of Guadalcanal.[10][11] Over the next 3 days the system remained as a shallow depression as it moved southwards, before it rapidly developed into a tropical cyclone underneath an upper level ridge of high pressure.[10][12] During March 8, the JTWC classified the system as Tropical Cyclone 22P and initiated advisories on the system, while it was named Yali by the FMS after it had developed into a Category 1 tropical cyclone on the Australian scale.[7][10] During the next day Yali continued to intensify before as the ridge of high pressure moved northwards, before the system peaked with 1 and 10-minute sustained windspeeds of 120 km/h (75 mph).[5][11][12] This made it a category 3 severe tropical cyclone on the Australian tropical cyclone intensity scale and equivalent to a category 1 hurricane on the Saffir-Simpson hurricane scale.[5][11] During the next day Yali rapidly weakened and dissipated over water during March 11.[5][10][11] Despite being within the vicinity of both Vanuatu and New Caledonia, the system did not pass close enough to affect or cause any damage to any inhabited islands.[10][9]

Category 2 tropical cyclone (Australian scale)
Tropical storm (SSHWS)
Duration	April 19 – April 26
Peak intensity	100 km/h (65 mph) (10-min)  975 hPa (mbar)

Cyclone Zuman existed from April 19 to April 26.

Category 1 tropical cyclone (Australian scale)
Duration	May 20 – May 22 (exited basin)
Peak intensity	75 km/h (45 mph) (10-min)  990 hPa (mbar)

On May 20, TCWC Nadi started to monitor a tropical depression that had developed about 1,440 km (895 mi) to the northeast of Port Vila, Vanuatu.[5]

In addition to 12  named cyclones, two other systems developed during the season. Cyclone 13P existed from February 2 to February 5. Another system, 19P, existed from February 28 to March 3.