Cyclone Gavin

Severe Tropical Cyclone Gavin

Category 4 cyclone (Australian scale) Category 4 Tropical Cyclone (SSHWS)
Cyclone Gavin near its peak intensity on March 8.
Formed	March 2, 1997
Dissipated	March 11, 1997
Highest winds	10-minute sustained: 185 km/h (115 mph) 1-minute sustained: 220 km/h (140 mph)
Lowest pressure	925 mbar (hPa); 27.32 inHg
Fatalities	18
Damage	$23.7 million (1997 USD)
Areas affected	Tuvalu, Wallis and Futuna, Fiji
Part of the 1996–97 South Pacific cyclone season

Severe Tropical Cyclone Gavin was the most intense tropical cyclone to affect Fiji, since Severe Tropical Cyclone Oscar of the 1982-83 cyclone season and was the first of three tropical cyclones to affect the island nations of Tuvalu and Wallis and Futuna during the 1996–97 season. The system that was to become Gavin was first identified during March 2, as a weak tropical depression that had developed within the monsoon trough of low pressure. Over the next two days the depression gradually developed further, before it was named Gavin by RSMC Nadi early on March 4 as it had developed into a tropical cyclone.

Meteorological history

On March 2, 1997, the Fiji Meteorological Service's Regional Specialized Meteorological Center in Nadi, Fiji (RSMC Nadi) and the United States Joint Typhoon Warning Center (JTWC) started to monitor a tropical depression that had developed within the monsoon trough to the northwest of the Fijian dependency of Rotuma.^[2][3][4] Over the next two days, the depression gradually developed further as it moved slowly towards the east — southeast, before the JTWC reported at 0600 UTC on March 3, that the system had become equivalent to a tropical storm and designated it as Tropical Cyclone 31P.^[3][5] Throughout that day Gavin intensified further before RSMC Nadi reported early on March 4, that the depression had become a category one tropical cyclone on the Australian tropical cyclone intensity scale and named it Gavin.^[6] After being named Gavin moved eastwards towards the southern Tuvaluan Islands and intensified quickly, with the JTWC reporting later that day that the system had become equivalent to a category 1 hurricane on the Saffir-Simpson hurricane scale (SSHS).^[3][7]

Early on March 5, RSMC Nadi reported that Gavin had become a category 3 severe tropical cyclone after the system had developed an eye.^[2][5] During that day two troughs of low pressure combined to steer the system to the southeast as it passed about 50 km (30 mi) to the southwest of Niulakita, Tuvalu with estimated 10-minute sustained wind speeds of about 155 km/h (100 mph).^[6][3] After Gavin had intensified throughout that day, RSMC Nadi reported at 1800 UTC, that the system had become a category 4 severe tropical cyclone, while the JTWC reported that the cyclone had reached its initial peak intensity with 1-minute sustained winds of 215 km/h (130 mph), which made it equivalent to a category 4 hurricane on the SSHS.^[2][7] Early on March 6, RSMC Nadi reported that Gavin was moving towards Fiji and had reached its peak intensity as a category 4 severe tropical cyclone, with 10-minute sustained winds of 185 km/h (115 mph).^[6][3] Later that day the system passed about 215 km (135 mi) to the west of the French territory of Futuna, before it started to weaken as it passed about 95 km (60 mi) to the northwest of Labasa on the Fijian Island of Vanua Levu.^[3]

Preparations and impact

Cyclone Gavin was responsible for at least 18 deaths and caused over US$23.7 million (AU$$30.1 million) worth of damage as it affected Tuvalu, Wallis and Futuna, Fiji and New Zealand.^{[nb 1]} Due to the impact of this storm, the name Gavin was retired from the tropical cyclone naming lists.^[8]

Tuvalu

Gavin was the first of three tropical cyclones to affect Tuvalu during the 1996-97 cyclone season, with Cyclones Hina and Keli affecting the islands later in the season.^[3][9][10] Ahead of the system affecting the Polynesian island nation, RSMC Nadi issued hurricane warnings for Niulakita and Nukulaelae while issuing gale or storm warnings for the other islands of Tuvalu.^[3] During the next day these warnings were gradually revised once it became clearer that Gavin was moving towards the southeast and away from the island nation, before all warnings were cancelled by 0600 UTC on March 6.^[3] After both Gavin and Hina had affected the island nation within a week off each other, a damage assessment team noted that it was difficult to assess damage done by Gavin alone and estimated the total damage from both cyclones at 7006222678000000000US$2.23 million, (7006214000000000000AU$2.14 million).^{[nb 2][3][9]} Both cyclones caused severe coastal erosion and destruction to food crops, on the southern islands of Niulakita and Nukulaelae, while damage in northern and central islands was confined mostly to houses.^[3] The cyclones waves, storm surge and strong winds both caused a severe amount of coastal erosion on all of the country’s nine atolls, with about 6.7% of the land washed into the sea.^[11] It was later estimated after Keli had affected the islands between June 12 – 16, 1996, that collectively the three cyclones had been responsible for about 50 hectares (120 acres) of land disappearing into the sea.^[3][12]

Wallis and Futuna

Early on March 5, RSMC Nadi placed both Wallis and Futuna under a tropical cyclone alert as Gavin was moving slowly towards the east — southeast and heading towards the islands.^[3] Later that day as Gavin turned and started to move southwards RSMC Nadi upgraded the alert to a gale warning for Futuna, but due to the turn to the south it was felt that a warning for Wallis Island wasn't needed.^[3] The alert for Wallis was subsequently cancelled early the next day while the Gale Warning was maintained for Futuna, as that island was still expected to be within the extent of gale force winds during that day.^[3] The gale warning for Futuna was cancelled later that day, after Gavin had moved well to the southwest of the island and moving further away.^[3] Most of the damage on the French territory was confined to the exposed northeast coastal parts of Futuna, where a heavy swell caused sea flooding at high tide and several food crops were damaged by the wind.^[3] This heavy swell resulted in some roads and public networks, being partially destroyed and some traditional houses being damaged.^[3] On Wallis Island, only a small amount of damage was reported, with some traditional houses and food crops flooded on the north coast by seawater at high tide.^[3]

Fiji

During March 4, RSMC Nadi issued a tropical cyclone alert for Rotuma, as it was possible that Gavin could produce gale force winds or pass over the island within 48 hours.^[3] However the alert was cancelled during the next day, after the cyclone had passed about 260 km (160 mi) to the northeast of the island and was no longer expected to produce any damage or gale force winds on the island.^[3] As they cancelled the alert for Rotuma, RSMC Nadi issued an alert for Fiji as it was apparent that Gavin was moving southwards towards the archipelago, before they started to issue various gale and storm warnings for Fiji during March 6.^[3] Over the next two days, RSMC Nadi issued various gale, storm and hurricane warnings for Fiji, as the system passed through the archipelago, before all warnings for Fiji were cancelled during March 8, after it had become apparent that gales were no longer affecting any part of Fiji.^[3]

Cyclone Gavin was the most destructive cyclone to affect Fiji since Cyclone Kina and became the most intense tropical cyclone on record to affect Fiji, after the meteorological station on Yasawa recorded a minimum pressure of 937 hPa (30 inHg).^[3] Heavy rain associated with Gavin caused serious flooding in Labasa and western parts of Viti Levu and caused serious flooding of the Nadi and Ba rivers.^[3] Major destruction of sugar cane and other food crops also occurred while at least 18 deaths were attributed to Gavin.^[3] This included 10 people lost at sea when a fishing vessel, the Wasawasa I, sank, and another 8 deaths caused by landslides, electrocution, and drowning.^[3] The total damage bill was estimated at 7007236806000000000US$23.7 million (7007300668000000000AU$30.1 million, 7007334000000000000FJ$33.4 million).^[3] However despite devastating several parts of Fiji, Gavins turn to the southwest just before it moved through the island nation spared Fijis two main populated islands of Vanua Levu and Viti Levu the full brunt of the cyclone.^[3]

New Zealand

After it moved out of the tropics, Gavin moved southwards and affected New Zealand between March 11–13 with high seas, heavy rain gale force winds and wind gusts of up to 130 km/h (80 mph).^[3][13][14] As a result of the heavy rain, some flooding was reported in parts of the Northland, Waikato, Bay of Plenty and Gisborne, which lead to road closures.^[14]

Notes

See also

• Cyclone Evan

References

External links

• World Meteorological Organization
• Fiji Meteorological Service
• Meteorological Service of New Zealand
• Joint Typhoon Warning Center

v t e Retired South Pacific tropical cyclone names 1970s Rosie Wendy Vivienne Agatha Bebe Carlotta Lottie Alison Elsa Marion Bob Charles Diana Fay Gordon Meli Robert Tina Wally 1980s Eddie Tahmar Gyan Issac Joti Lisa Mark Oscar Veena Nigel Eric Harry Ima Namu Raja Sally Tusi Uma Anne Bola Lili 1990s Ofa Peni Sina Tia Val Wasa Betsy Esau Fran Joni Kina Prema Rewa Theodore William Beti Drena Gavin Hina Keli Martin Osea Ron Susan Tui Ursula Veli Cora Dani Frank 2000s Kim Paula Sose Trina Waka Zoe Ami Beni Cilla Heta Ivy Meena Nancy Olaf Percy Cliff Daman Funa Gene Mick 2010s Oli Pat Tomas Ului Vania Wilma Yasi Atu Book · Category · Portal · WikiProject · Commons

v t e Tropical cyclones of the 1996–97 South Pacific cyclone season 1 Cyril 3 Fergus 4 Drena 3 Evan 2 Freda 2 Harold 2 29P 4 Gavin 3 Hina 1 Ian 2 June 1 38P 3 Keli Book · Category · Portal · WikiProject · Commons