2004–05 South Pacific cyclone season

On December 21, RSMC Nadi reported that Tropical Disturbance 04F had developed, along an active and slow-moving monsoon trough near French Polynesia.

Later that day at 1800 UTC the Depression was upgraded to a category one tropical cyclone and was named Judy whilst located about 510 km (320 mi) southeast of Tahiti and moving towards the southwest.

Judy degenerated into an extratropical cyclone during December 27, before it was last noted later that day as it merged with an area of low pressure to the south of Tahiti.

[4] On February 1, the RSMC Nadi began monitoring a tropical disturbance, which they designated as 07F, to the west of the Northern Cook Islands.

During that day Nancy started to rapidly intensify becoming a Severe Tropical Cyclone late on February 13 as a small, irregularly shaped, eye had begun to develop.

Early on February 17, Nancy transitioned into an extratropical cyclone as it entered the area of responsibility of TCWC Wellington.

Shortly afterwards, the low was absorbed into the larger circulation of Olaf however it was monitored by TCWC Wellington as a separate system until 1200 UTC on February 18.

Percy quickly formed from an area of low pressure on February 24 and reached Category 1 status north of American Samoa.

At this time convection detached from the disturbance's low level circulation center, whilst vertical wind shear around the system remained weak.

[10][11] The Depression remained weak reaching an estimated central pressure of 1001 hPa (mbar) early on March 3, however there were no winds reported by RSMC Nadi whilst they were monitoring it.

[11][12] RSMC Nadi then issued their last advisory on 13F early on March 4 after no persistent convection reported around the system since the depression reached its peak pressure.

[14] The second tropical depression of the season developed on December 3, about 280 km (170 mi) to the north of Port Villa, Vanuatu.

[2] The system subsequently moved southwards between Vanuatu and Fiji, before it was last noted during December 14, while it was located to the southeast of Port Villa.

[2] During February 26, RSMC Nadi reported that Tropical Depression 11F had formed, within the Tuamotu Archipelago of islands in French Polynesia.

[7][17] During April 20 Tropical Disturbance 16F developed within a monsoon trough, about 570 km (350 mi) to the southeast of Apia on the Samoan island: Upolu.