1996–97 South Pacific cyclone season

[8][9] The names Drena, Fergus, Gavin, Hina and Keli were subsequently retired, by the World Meteorological Organization's RA V Tropical Cyclone Committee.

[10] On November 20, a complex area of low pressure formed within a convergence zone about 250 km (155 mi) to the northeast of Guadalcanal in the Solomon Islands.

On February 19, Harold moved into the basin from the Australian region as a weakening Category 2 tropical cyclone, The storm produced large swells along west-facing coasts of New Caledonia.

[17] On February 23, a depression formed near the Southern Cook Islands and gradually developed further over the next couple of days, as it moved south-westwards over the open seas.

[18] 3 hours later, the "Capitaine Tasman" encountered the system and recorded 10-minute sustained winds of 110 km/h (70 mph) near the centre, which made it a category 2 tropical cyclone on the Australian Scale.

[23] During that day the system continued its northwards movement until it curved eastwards and later south-eastwards during March 14, before it passed about 55 km (35 mi) to the southeast of Niulakita the southernmost island of Tuvalu.

[21] After being named the system accelerated towards the south-southeast and an area of increasing vertical wind shear, as it passed near the west coast of Futuna Island.

[24][25] Early on March 16, the FMS reported that based on satellite imagery and guidance from other meteorological centers, the system had 10-minute sustained wind speeds of 85 km/h (55 mph) as it passed over Southern Tonga.

[21][27] After impacting Tonga the system moved rapidly towards the south-southeast and weakened below tropical cyclone intensity, before it was last noted on March 21, to the south of the Pitcairn Islands.

[1][28] During the systems post analysis it was determined that the warning centres had underestimated Hina's intensity as it passed over Tonga, after damage had been greater than expected in the island nation.

the FMS subsequently deduced that Hina was a minimal category 3 severe tropical cyclone, with peak 10-minute sustained wind speeds of 120 km/h (75 mph) when it impacted Tonga.

Storm surge and strong winds from both cyclones caused a severe amount of coastal erosion, on all of the country's nine atolls with about 6.7% of land washed into the sea.

[citation needed] On ʻEua Island, Hina was estimated to have caused greater damage, then Cyclone Isaac had done fifteen years previously.

[32] Over the next few days, the circulation developed into a tropical depression, as it moved southeastwards parallel to the islands of Vanuatu, under the influence of a subtropical ridge of high pressure.

[35] Over the next couple of days, the system remained poorly organised under the influence of vertical wind shear, from the northwest as it moved slowly towards the south-southwest.

[1][35] At this stage the system was located about 600 km (375 mi) to the northwest of Nadi, Fiji, and was expected to turn towards the southwest and a break in the subtropical ridge of high pressure during the next day.

[35] The FMS subsequently reported early the next day that the system had peaked as a category 2 tropical cyclone, with 10-minute sustained wind speeds of 95 km/h (60 mph).

[39] Later that day the JTWC reported that the system had peaked with 1-minute sustained wind speeds of 120 km/h (75 mph), which made June equivalent to a category 1 hurricane on the SSHWS.

[40] During May 26, the JTWC started monitoring a tropical disturbance that had developed to the southeast of the Solomon Islands, in response to strong westerly winds along the equator.

[43][45][46] At this stage, the system was located about 335 km (205 mi) to the northeast of Niulakita in Tuvalu and was moving south-westwards towards the island as it continued to gradually intensify.

[43][45][47] Later that day, at about 06:00 UTC (18:00 TVT), the FMS estimated that Keli had peaked in intensity as a category 3 severe tropical cyclone, with 10-minute sustained winds of 150 km/h (90 mph).

[44][7] After it had peaked in intensity, Keli encountered higher levels of vertical windshear which caused it to start to weaken and transition into an extratropical cyclone, before it passed about 55 km (35 mi) to the west of Wallis during June 13.