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Severe Tropical Cyclone Gita was the most intense tropical cyclone to impact Tonga since reliable records began. The second named storm and first major tropical cyclone of the 2017–18 South Pacific cyclone season, Gita originated from a monsoon trough that was active in the South Pacific in early February 2018. First classified as a tropical disturbance on 3 February, the nascent system meandered near Vanuatu for several days with little development. After acquiring a steady east trajectory near Fiji, it organized into a Category 1 tropical cyclone on 9 February near Samoa. Arcing south in a clockwise turn, the system rapidly intensified, and became a severe tropical cyclone on 10 February near Niue.
Throughout its path in the South Pacific, Cyclone Gita affected multiple island nations and territories. Tonga was the hardest-hit, with severe damage occurring on the islands of Tongatapu and ʻEua; two fatalities and forty-one injuries occurred in the kingdom. At least 171 homes were destroyed and more than 1,100 suffered damage. Violent winds destroyed homes and left the two islands largely without power. Torrential rains and damaging winds caused widespread disruptions in Samoa and American Samoa, prompting emergency declarations in both. Outlying islands in the Lau Islands were significantly affected, particularly Ono-i-Lau and Vatoa. Wallis and Futuna, Niue, and Vanuatu were also affected, but impacts in those areas were minor. Total damage from Gita is estimated to be in excess of US$252 million, primarily in American Samoa and Tonga.
After Gita was named, a prolonged period of rapid intensification ensued as it quickly intensified into a Category 1 tropical cyclone on the Australian tropical cyclone intensity scale, before it passed within of Samoa and American Samoa. After moving past the Samoan Islands, Gita turned southeast, then southwards, under the influence of a near-equatorial ridge to the northeast. On 10 February, Gita rapidly intensified to a category 3 severe tropical cyclone on the Australian scale while traversing anomalously warm sea surface temperatures of between . The system bypassed Niue to the east during this intensification phase. On 11 February, Gita continued to intensify into a category 4 severe tropical cyclone. At the same time, Gita turned westward under the influence of a subtropical ridge to the south. Around 12:00 UTC on 12 February, the cyclone passed near or over the islands of ʻEua and Tongatapu as a high-end Category 4 severe tropical cyclone. At this time, maximum 10-minute sustained winds were estimated at making Gita the strongest cyclone to strike the nation since reliable records began. The JTWC estimated the system to have reached its overall peak intensity at this time as a Category 4-equivalent on the Saffir-Simpson scale with 1-minute sustained winds of .
At 18:00 UTC on 13 February, Gita reached its peak strength approximately south of Kadavu Island, Fiji, as a Category 5 severe tropical cyclone with ten-minute sustained winds of , gusts to , a minimum pressure of 927 mbar (hPa; 27.37 inHg).
| + Effects of Cyclone Gita by country and territory | ||||
| $52–200 million | ||||
| None | ||||
| Minor | ||||
| $606,000 | ||||
| Minor | ||||
| $26.1 million | ||||
| None | ||||
| $10 million | ||||
| $164.1 million | ||||
| Minor | ||||
Cyclone Gita reached American Samoa on 9 February, bringing heavy rains and strong winds from 4:00 a.m. to 2:00 p.m. local time. The strongest winds were recorded at the NOAA Earth System Research Laboratory Office in Cape Matatula on Tutuila; sustained values reached and gusts peaked at . These winds tore roofs of structures and downed trees and power lines across the territory, with the most severe damage reported in Nuʻuuli and Tafuna. Approximately 90 percent of the island was left without power and water and nearly 1,000 people required evacuation. The NWS Office lost power; the Honolulu, Hawaii, office issued forecasts in the interim. Rainfall in Pago Pago exceeded . Flash floods and mudslides occurred territory-wide, with valleys and low-lying areas being most affected. Multiple streams flooded and prompted evacuations in Malaeloa village. Landslides were reported in Avau, Amanave, and Poloa. Approximately 3,000 people reported damage to their crops. Destruction of banana, papaya, and breadfruit crops temporarily limited the availability of food. At the American Samoa National Park, every trail closed. All trails in National Park are closed, Talanei.com, February 16, 2018
Offshore, the cargo ship Uila o le Sami sank near Taʻū during the storm. Approximately off Leone Bay, the Taiwanese-flagged fishing vessel Chui Kai Fa No. 1 grounded on 5 February and split in half. The vessel was previously adrift in international waters following a fire on 4 November 2017. The grounding of the Chui Kai Fa No. 1 prompted the closure of the port of Pago Pago until 11 February. The vessel contained an estimated of diesel fuel and a light oil sheen was reported in the area. Inclement weather produced by Cyclone Gita impeded response efforts by the United States Coast Guard.
An assessment by the American Samoa Public Works in March 2018 determined that Cyclone Gita destroyed 387 homes, inflicted major damage to more than 1,300 homes, and damaged a further 1,600. The American Samoa Department of Commerce estimated that half of the territory's population suffered some form of property loss and placed total damage at US$200 million. A 2019 report by the American Samoa Economic Forecast calculated combined direct and indirect losses at US$186 million. The National Centers for Environmental Information calculated a lower damage total of US$52 million. In contrast to the scale of damage, no fatalities or injuries were reported.
On 10 February, a Coast Guard AC-130 conducted aerial surveys of the territory and a small group of Federal Emergency Management Agency (FEMA) personnel were deployed. By 18 April, almost 100 federal personnel were deployed to the territory. United States President Donald Trump declared a state of emergency for American Samoa on 11 February. The United States Army Reserve assisted FEMA and the American Red Cross with the deployment of personnel and distribution of relief supplies. Furthermore, the Army Reserve Pago Pago facility was converted into a staging area for the disaster response. The United Nations Development Programme initiated a US$100,000 response plan on 16 February to support the local governmental response. President Trump later declared the territory a major disaster area on 2 March. Following this declaration, the Internal Revenue Service announced that residents could apply for . Health officials advised residents to boil water amid an enhanced risk of dengue fever. StarKist Samoa donated US$50,000 to the American Samoa Government on 16 March. On 9 April 2019, Representative Nita Lowey (D-NY) introduced the Additional Supplemental Appropriations for Disaster Relief Act, 2019 () bill to the 116th Congress. The bill, signed into law by President Trump on 6 June, provided just over US$17.2 billion for disaster recovery nationwide; of this US$18 million was allocated for American Samoa and made available through February 2020. However, distribution of these funds was delayed and Governor Lolo Matalasi Moliga urged the United States Department of Agriculture to expedite the process. Through March 2021, FEMA provided US$31,198,512.50 in financial assistance: $20,543,787.44 in individual funds, US$9,763,391.26 for public assistance, and US$891,333.80 for a hazard mitigation program. A further US$40 million was provided through the Small Business Administration, intergovernmental agreements, disaster grants, and private distributions.
A prolonged downturn in the territory's tuna industry in the decade preceding Gita led to an economic recession. The nationwide reconstruction efforts and the influx of money in the wake of the cyclone spurred slight growth of the American Samoa economy, reflecting in the gross domestic product increasing by 2.2 percent in 2018, and a pause in the recession. This economic stimulation quickly subsided and American Samoa's economy contracted in 2019.
On the neighboring island of ʻEua, the storm knocked out power to all residents and caused extensive damage. Similar to Tongatapu, older structures suffered severe damage while newer buildings fared well. Crops were largely destroyed. Fifty-two homes were completely destroyed on the island; eight people suffered injury, including one severe. Total damage were estimated at T$356.1 million (US$164.1 million), including a NZ$20 million (US$14.5 million) damage to the power grid.
Immediately following the storm, a curfew was imposed for all of Tonga. Personnel from His Majesty's Armed Forces rescued people during the storm and began clearing roads at daybreak on 13 February. National Emergency Management Office spokesman Graham Kenna called the storm "the worst situation he been in" during his 30-year career. MP Lord Fusituʻa described the impact as the worst since at least Cyclone Isaac in 1982. India provided US$500,000 humanitarian aid to Tonga under UNOSSF. On 13 February, Australia provided A$350,000 (US$275,000) in emergency supplies via the Royal Australian Air Force (RAAF) to assist more than 2,000 people. Australia also sent humanitarian supplies to the Tongan Red Cross. Two civilian humanitarian specialists were deployed to assist Tonga's National Emergency Management Office. A medical expert also provided assistance to assess health infrastructure. New Zealand provided NZ$750,000 (US$544,000) in assistance.
On 13 February, the center of Gita passed roughly south of Ono-i-Lau in the Lau Islands of Fiji. Observations from the island revealed peak sustained winds of with gusts to . Twenty-four hour rainfall reached , greatly contributing to the island experiencing its wettest February on record; the monthly total was . Flooding from tidal surge preceded the core of the cyclone by several hours. Structural damage was reported in Doi Village, including one home that lost its roof. Communications with Ono-i-Lai and nearby Vatoa were disrupted for roughly a day. Across both islands, 10 homes were destroyed and 26 more sustained damage. Many structures sustained roof damage and crops were devastated. Local leaders on Ono-i-Lau called the storm the "worst in living memory". Damage to the nation were at Fijian dollar1.23 million (US$606,000).
As Gita bore down on the South Island, bringing floods and strong winds, a state of emergency was eventually declared on 20 February. Total insured losses across New Zealand reached NZ$35.6 million (US$26.1 million). In Taranaki, Gita resulted in NZ$4.5 million (US$3.1 million) worth of damage. A tree fell on a water main near the water treatment plant south of New Plymouth, leaving 10,000 homes without water for 3 days and 26,000 homes on a boil water notice for 7 days.
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