Cyclone Ofa

OfaSevere Tropical Cyclone Ofa
Severe Tropical Cyclone Ofa was considered to be the worst tropical cyclone to affect Polynesia since Cyclone Bebe.wikipedia
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Tuvalu

Ellice IslandsElliceEllice group
As a result, two shallow tropical depressions were spawned; one over the Coral Sea that went on to become Cyclone Nancy, while the other was first noted within the SPCZ over Tuvalu on January 27.
Along with a tropical depression that affected the islands a few days later, Severe Tropical Cyclone Ofa had a major impact on Tuvalu with most islands reporting damage to vegetation and crops.

1989–90 South Pacific cyclone season

1989–90August – Dec.Samoa depression
The island nation of Tuvalu was affected by Severe Tropical Cyclone Ofa during February 1, with strong to gale-force winds causing a major impact on the island nation, along with the Samoa depression that affected the islands a few days later.
The most damaging tropical disturbance was Cyclone Ofa, one of the strongest storms to affect Samoa in the 20th century, which caused at least in damage to multiple countries and left eight dead.

Cyclone Val

ValHurricane Val1991
Most of these island nations were still recovering from the severe impact of Severe Tropical Cyclone Ofa, which was considered to be the worst tropical cyclone to affect Polynesia since Severe Tropical Cyclone Bebe in 1972.

Tropical cyclone

hurricanetropical stormhurricanes
Severe Tropical Cyclone Ofa was considered to be the worst tropical cyclone to affect Polynesia since Cyclone Bebe.

Polynesia

South SeasSouth Sea IslandsPolynesian Islands
Severe Tropical Cyclone Ofa was considered to be the worst tropical cyclone to affect Polynesia since Cyclone Bebe.

Cyclone Bebe

BebeHurricane BebeSevere Tropical Cyclone Bebe
Severe Tropical Cyclone Ofa was considered to be the worst tropical cyclone to affect Polynesia since Cyclone Bebe.

Extratropical cyclone

extratropicalextratropical transitionextratropical storm
Ofa was declared an extratropical cyclone on February 8, though the system was still tracked by meteorologists until February 10. The system subsequently weakened very quickly and started to transition into an extratropical cyclone, as it encountered strong upper level winds and cooler waters.

Meteorology

meteorologicalmeteorologistmeteorologists
Ofa was declared an extratropical cyclone on February 8, though the system was still tracked by meteorologists until February 10.

Storm surge

storm tidetidal surgestorm surges
Ofa produced gales or high winds or gales on many islands, resulting in widespread damage due to a combination of storm surge and high seas.

Samoa

Western SamoaIndependent State of SamoaSamoan
The worst effects were recorded in Samoa, where seven people were killed.

Niue

Niue IslandNiue-FekaiNiueans
Elsewhere, Ofa was blamed for the lowest ever recorded pressure on the island of Niue, along with considerable damage.

Trade winds

trade windtradewindseasterlies
Towards the end of January 1990, a surge in the Northern Hemisphere's trade winds and the Southern Hemispheres monsoon, led to the South Pacific Convergence Zone (SPCZ) and the Australian monsoon trough becoming active after a prolonged period of dormancy.

South Pacific convergence zone

convergence zoneSouth Pacific convergence zone (SPCZ)
Towards the end of January 1990, a surge in the Northern Hemisphere's trade winds and the Southern Hemispheres monsoon, led to the South Pacific Convergence Zone (SPCZ) and the Australian monsoon trough becoming active after a prolonged period of dormancy.

Funafuti

Funafuti AtollFuna Futi Funafuti
Over the next two days the system developed little and remained slow moving, near the Tuvaluan atoll of Funafuti.

Joint Typhoon Warning Center

Joint Typhoon Warning Center (JTWC)JTWCNaval Pacific Meteorology and Oceanography Center
During the next day the system subsequently started to curve south-eastwards and away from Tuvalu, before the United States Naval Western Oceanography Center (NWOC) initiated advisories on the system and designated it as Tropical Cyclone 13P during January 31.

Fiji Meteorological Service

Nadi, FijiRSMC NadiRegional Specialized Meteorological Center (RSMC)
At 19:17 UTC on January 31, Fiji Meteorological Service named the system Ofa, after it had developed into a category 1 tropical cyclone on the Australian tropical cyclone intensity scale.

Tropical cyclone scales

Australian tropical cyclone intensity scalesevere tropical stormmajor hurricane
At 19:17 UTC on January 31, Fiji Meteorological Service named the system Ofa, after it had developed into a category 1 tropical cyclone on the Australian tropical cyclone intensity scale.

Saffir–Simpson scale

Saffir–Simpson hurricane wind scaleSaffir-Simpson Hurricane ScaleSaffir–Simpson Hurricane Scale
During February 1, as Ofa started to affect Western Samoa, the NWOC reported that Ofa had become equivalent to a category 1 hurricane on the Saffir-Simpson Hurricane Wind Scale (SSHWS).

Savai'i

SavaiiSavai'i IslandSavaii Island
Ofa passed about 110 km to the west of the Western Samoan Island of Savai'i between 10:00 and 18:00 UTC during February 3.

MetService

Meteorological Service of New Zealand LimitedWellington, New ZealandMeteorological Service of New Zealand
Over the next day the system slowly weakened as it moved southwards, before late on February 6, the FMS passed the primary warning responsibility for Ofa to the New Zealand Meteorological Service, after the system had moved below 25°S.

25th parallel south

25°S25 degrees south25th parallels
Over the next day the system slowly weakened as it moved southwards, before late on February 6, the FMS passed the primary warning responsibility for Ofa to the New Zealand Meteorological Service, after the system had moved below 25°S.

Sea surface temperature

sea surface temperatureswater temperaturesocean temperature
The system subsequently weakened very quickly and started to transition into an extratropical cyclone, as it encountered strong upper level winds and cooler waters.

Wallis (island)

Wallis IslandWallisUvea
During February 2, the FMS issued a gale warning for Wallis while maintaining the alert for Futuna, as it was expected to pass near enough to Wallis to cause gale-force winds on the island.

Nukunonu

NukunonoNukunonu atoll
Ofa caused extensive damage to the islands public buildings, after sea walls around the atolls of Nukunonu, Atafu and Fakaofo were washed away by high seas.