Meteorological history | |
---|---|
Formed | December 9, 2012 |
Extratropical | December 19, 2012 |
Dissipated | December 27, 2012 |
Category 4 severe tropical cyclone | |
10-minute sustained (FMS) | |
Highest winds | 185 km/h (115 mph) |
Lowest pressure | 943 hPa (mbar);27.85 inHg |
Category 4-equivalent tropical cyclone | |
1-minute sustained (SSHWS/JTWC) | |
Highest winds | 230 km/h (145 mph) |
Lowest pressure | 929 hPa (mbar);27.43 inHg |
Overall effects | |
Fatalities | 14 confirmed |
Damage | $313 million (2012 USD) |
Areas affected | Samoa,American Samoa,Wallis and Futuna,Fiji,Tonga,New Zealand |
IBTrACS | |
Part of the 2012–13 South Pacific cyclone season |
Severe Tropical Cyclone Evan was considered to be the worst tropical cyclone to affect the island nation of Samoa since Cyclone Val in 1991 and was the strongest storm to impact the main South Pacific islands until Winston in 2016. The system was first noted on December 9,2012,as a weak tropical depression about 700 km (435 mi) to the northeast of Suva,Fiji. Over the next couple of days,the depression gradually developed further before it was named Evan on December 12,as it had fully developed into a tropical cyclone. During that day the system moved toward the Samoan Islands and gradually intensified,before the system slowed and severely affected the Samoan Islands during the next day with wind gusts of up to 210 km/h (130 mph).
The storm moved east and impacted the French islands of Wallis and Futuna before affecting Samoa and American Samoa. On December 16,Evan turned to the south and paralleled western areas of Fiji. [1]
The tropical depression that was to become Severe Tropical Cyclone Evan was first noted by the Fiji Meteorological Service (FMS) on December 9, while it was located within the South Pacific Convergence Zone near the Fijian dependency of Rotuma. [2] [3] At this stage, the system's broad low-level circulation was poorly organised, while the majority of atmospheric convection was fragmented and located over its northeastern quadrant. [2] [4] Over the next day, the system subsequently moved south-eastwards within an area favourable for further development, with low vertical windshear, sea surface temperatures of 29–30 °C (84–86 °F) and favourable outflow. [4] [5] During December 11, the systems low-level circulation centre started to rapidly consolidate, as it passed around 55 km (35 mi) to the southwest of the French Territory of Futuna. [5] [6] [7] Later that day as the depression became equivalent to a tropical storm and develop a small eye on microwave imagery, the United States Joint Typhoon Warning Center initiated advisories on the system and designated it as Tropical Cyclone 04P. [8] [9] This was followed by the FMS naming the system as Evan the following day, after it had become a Category 1 tropical cyclone on the Australian tropical cyclone intensity scale. [10] [11]
After the system was named, the upper-level ridge continued to steer Evan eastward, toward the Samoan islands, as the cyclone quickly intensified. [12] By December 12, as the system started to impact the Samoan Islands with gale and storm force wind speeds, RSMC Nadi reported that the system had become a category 2 tropical cyclone with 10-minute sustained wind speeds of 90 km/h (55 mph). [13] [14] The JTWC also reported that day that the system had become equivalent to a category 1 hurricane on the Saffir-Simpson hurricane scale (SSHS) with 1-minute sustained wind speeds of 120 km/h (75 mph). [7] [15] Over the next 12 hours, the system developed a 17 km (11 mi) cloud-filled eye on visible imagery, while the system's forward motion started to slow down as it entered a weak steering environment with the upper-level ridge of high pressure to the north of the system weakened and a subtropical ridge of high pressure developed to the south of the system. [16] [17]
The system continued to intensify and began to re-curve toward the west on December 16; at 18:00 UTC (07:00 UTC+13, December 17) the JTWC reported that Evan had reached an intensity of 185 km/h (115 mph), which made it equivalent to a category 3 hurricane on the SSHS. [18]
Early on December 17, the JTWC reported that Cyclone Evan had reached its peak intensity with 1-minute windspeeds of 230 km/h (145 mph), which made it equivalent to a category 4 hurricane on the SSHS. [18] [19] During that day Evan started to gradually weaken as it moved around the coast of the Fijian island of Viti Levu. With RSMC Nadi reporting by 18:00 UTC (07:00 UTC+13, December 18) that the system had weakened into a category 3 severe tropical cyclone. [19] [20]
By December 19, wind shear from the northwest had exposed the system's low level circulation center completely, pushing the bulk of convection and thunderstorm activity about 120 km (75 mi) to the southeast of the center. Evan had also moved into cooler sea surface temperatures, below 27 °C (81 °C), so evaporation and thunderstorm development had waned, leading to falling cloud heights because of less moisture. [21]
Later that same day, RSMC Nadi reported that Cyclone Evan had weakened below cyclone intensity and declassified it as a tropical cyclone, before the JTWC issued their final warning later that day as the system started to transition into an extratropical cyclone. [22] [23] Over the next couple of days the remnant low continued moving southwards and moved below 25°S and into the Wellington tropical cyclone warning centre's (TCWC Wellington area of responsibility. [24] [25] During December 21, the system started to move towards the southwest as it directed a moist tropical airmass onto the North Island during the next day. [24] [26] The remnants of Evan were last noted by TCWC Wellington during December 25. [27] [28]
Severe Tropical Cyclone Evan impacted the island nations of Wallis and Futuna, Samoa, American Samoa, Niue, Tonga, Fiji and New Zealand, with 14 deaths reported and total damages estimated at over US$315 million. As a result of its impact on the island nations, the name Evan was subsequently retired, from the list of names for the region by the World Meteorological Organization. [29]
On December 10, the FMS issued heavy rain warnings for parts of Fiji, as the trough of low pressure associated with the system, was bringing heavy rain and squally thunderstorms to parts of Fiji which they warned could lead to flash floods in parts of the archipelago. [30] These warnings were subsequently cancelled during the next day as the system moved away from Fiji, however they started to note that the global numerical weather guidance products were agreeing on the depression, re-curving as a tropical cyclone and to start directly impacting Fiji from December 16. [31] [32] During the next three days, the FMS issued calls for communities to be prepared, heed warnings and act responsibly, so that they could avoid "unnecessary loss of lives and properties", as Cyclone Evan was expected to be at least a Category 4 Severe Tropical Cyclone when it entered Fijian waters. [11] [33] From December 15 to 18, as the system approached and passed through the archipelago, the FMS issued various strong, gale, storm and hurricane-force wind warnings for Fiji. [34] [35] [36]
Ahead of the system approaching and impacting the island nation, people were evacuated to emergency shelters. [37] Fiji Airways (Air Pacific) announced they are suspending all flights to Savusavu, as well as the international flights from Nadi to Auckland and Brisbane on December 16. [38] [39]
Upon passing over Fiji, over 8,000 people were living in shelters, including many tourists. Although there were no initial reports of casualties, the storm brought considerable damage. Trees and power lines were down across the island group. In addition, flooding and structural damage was reported from resorts and homes. [40]
Damage throughout Fiji amounted to FJ$169.9 million (US$108.8 million). Additionally, short-term economic losses related to the cyclone were estimated reach FJ$73.4 million (US$40.9 million). [41]
Precipitation | Storm | Location | Ref. | ||
---|---|---|---|---|---|
Rank | mm | in | |||
1 | 674.9 | 26.57 | Raja 1986 | Maopoopo, Futuna Island | [42] |
2 | 556.7 | 21.92 | Fran 1992 | Hihifo, Wallis Island | [42] |
3 | 291.2 | 11.46 | Val 1975 | Hihifo, Wallis Island | [42] |
4 | 220.6 | 8.69 | Hina 1997 | Maopoopo, Futuna Island | [42] |
5 | 186.0 | 7.32 | Evan 2012 | Futuna Island | [42] |
6 | 180.0 | 7.09 | Val 1980 | Maopoopo, Futuna Island | [42] |
7 | 171.6 | 6.76 | Keli 1997 | Hihifo, Wallis Island | [42] |
8 | 160.8 | 6.33 | Unnamed 1966 | Malaetoli, Wallis Island | [42] |
9 | 160.0 | 6.30 | Amos 2016 | Hihifo, Wallis Island | [43] |
10 | 119.0 | 4.69 | Waka 2001 | Hihifo, Wallis Island | [42] |
Cyclone Evan affected Wallis and Futuna on two separate occasions while it was active, with the cyclone first affecting Futuna during December 11, before passing within 20 km (10 mi) of Wallis Island on December 15, and 70 km (45 mi) of Futuna Island during the next day. [44] On December 11, Futuna Island recorded 186 mm (7.3 in) of rainfall and wind speeds of up to 55 km/h (35 mph) as Evan passed just to the north of the island. [44] Ahead of the system affecting the French Territory for the second time, various warning alerts were issued for the two islands, with people were urged to prepare. [45] [46] [47] As the system passed near Wallis island, wind gusts of up to 156 km/h (97 mph) were recorded, which were the highest recorded wind gusts on Wallis Island since records began in 1971. [44] The cyclone passed through the French territory without any reported casualties, and while Futuna Island was spared any major damage, extensive damage was reported on Wallis Island. [48]
Cyclone Evan affected the independent state of Samoa between December 11 and 15, and was considered to be the worst tropical cyclone to affect Samoa, since Cyclone Val in 1991. [49] [50] After the system was named on December 12, the Samoan Deputy and Acting Prime Minister Fonotoe Pierre Lauofo, signed a Disaster Declaration which lasted for 48 hours and activated all disaster response provisions of the Samoan National Disaster Management Plan. [51] [52] During that day the Samoa Meteorology Division issued gale and storm force wind warnings and a hurricane watch for Samoa, while preparations for the system started with several people boarding up their homes. [14] [49] [53] During the next day these preparations continued before the SMS issued a hurricane warning for Upolu, after marginal hurricane-force winds of 114 km/h (71 mph) were observed on Mount Fiamoe, Upolu. [14] [49]
The cyclone struck, causing widespread damage in the capital, Apia. Many of the roads were blocked by flood waters and downed banana trees. Evan also caused damage to Faleolo International Airport in Apia, where the departures lounge collapsed, forcing its temporary closure. As a result, Fiji Airways (Air Pacific) cancelled all flights to Apia for December 14 and 15, citing safety concerns. [54] [55] Wind gusts of up to 210 km/h (130 mph) were reported. The storm destroyed houses and caused almost complete failures in the power and water supply systems. [56] The Disaster Management Office reported that the Tanugamanono power plant was heavily damaged, and power might not be restored for up to two months in some areas. A water treatment plant near Apia was also reported destroyed. [57] At least three deaths were reported after the storm, [58] including two children who were in low-lying areas and drowned. Authorities expressed concern over about the fate of at least 7 people who are still missing, as well as up to 3,000 others now living in emergency shelters. [59] [60]
The US Ambassador to New Zealand and Samoa David Huebner confirmed the United States had provided NZ$60,000 to the Samoan Red Cross for relief operations. New Zealand authorities said they were also ready to provide financial aid, if the local government requests it. On December 15, they did provide NZ$50,000, as well as a P-3 Orion plane to search for eight missing fishermen. [61] Two days later the New Zealand Foreign Affairs Minister Murray McCully announced an additional NZ$550,000 was to be made available to the Samoan government, as well as the Samoan Red Cross and any agencies on the ground that might need it. Five additional New Zealand Red Cross workers were also sent to support local efforts. The Samoan Parliament opened with a somber prayer session, as the legislators prepared to receive initial assessments of the economic damage wrecked by Evan. According to reports, the bill is expected to be at least NZ$200,000,000, and possibly rise as high as 300 million. [62] [63]
On December 17, Samoan authorities confirmed that the death toll reached 14, after rescuers abandoned the search for 10 missing sailors. [64] In all, damage from the storm amounted to WS$465 million (US$204 million). [65]
The Pago Pago National Weather Service Forecast Office issued a gale watch for all of American Samoa a day before the storm impacted the island. [66] As Evan intensified and moved closer to the archipelago, hurricane warnings and flash flood watches were issued for Tutuila, Aunuu, Manua and Swains Island. [67] On December 14, authorities announced that there had been no major damage or injuries after the passage of the storm. [61]
On December 12, the FMS issued a tropical cyclone alert for the Tongan Islands Niuatoputapu and Niuafo'ou as it was thought that Evan might cause gale-force winds over the islands within 48 hours. [68] During December 14, the alert was cancelled as Evan was no longer predicted to pass close enough to the islands to produce gale force winds or any damage on either island. [69]
During December 23, as Cyclone Evan's remnants moved towards New Zealand, TCWC Wellington issued Severe Weather Warnings for parts of Northland, Auckland and Coromandel as between 70–100 mm (2.8–3.9 in) of rain expected to fall which could cause surface flooding. [24] They also predicted that parts of New Zealand would see strong or gale-force winds and that the eastern coasts of Northland, might see large sea waves of about 3–4 metres (9.8–13.1 ft). [24] During that day in parts of the Coromandel Ranges, over 100 mm (3.9 in) of rain fell while in other parts of the warning area 25–50 mm (0.98–1.97 in) fell while the system was blamed for creating foggy conditions that engulfed parts of the North Island, and led to over 100 flights being cancelled at Wellington Airport. [70] [71] [72] On December 24, the threat of heavy rain, surface flooding, swells and strong to gale-force winds continued while a swimmer drowned in rough seas of Whiritoa beach. [70] [73] During that day heavy rain and the threat of flooding gradually eased, before the remnants were last noted during the next day. [27] [28] [74]
The 2007–08 South Pacific cyclone season was one of the least active South Pacific tropical cyclone seasons on record, with only four tropical cyclones occurring within the South Pacific basin to the east of 160°E. The season officially ran from November 1, 2007, until April 30, 2008, although the first cyclone, Tropical Depression 01F, developed on October 17. The most intense tropical cyclone of the season was Severe Tropical Cyclone Daman, which reached a minimum pressure of 925 hPa (27.32 inHg) as it affected Fiji. After the season had ended, the names Daman, Funa, and Gene were retired from the tropical cyclone naming lists.
The 2006–07 South Pacific cyclone season was an event in the annual cycle of tropical cyclone formation. It began on November 1, 2006 and ended on April 30, 2007. These dates conventionally delimit the period of each year when most tropical cyclones form in the southern Pacific Ocean east of 160°E. Additionally, the regional tropical cyclone operational plan defines a tropical cyclone year separately from a tropical cyclone season, and the "tropical cyclone year" runs from July 1, 2006 to June 30, 2007.
The 2008–09 South Pacific cyclone season was a below average tropical cyclone season, which featured six named tropical cyclones compared to an average of about nine. Ahead of the season officially starting on November 1, 2008, the Island Climate Update tropical cyclone outlook predicted that the season, would feature an average risk of tropical cyclones impacting the South Pacific between 160°E and 120°W. The first tropical disturbance of the season developed to the northeast of the Samoan Islands on December 1, however, it remained weak and was last noted during the next day.
Severe Tropical Cyclone Gene was the deadliest storm as well as the most damaging tropical cyclone of the 2007–08 South Pacific cyclone season east of 160ºE. RSMC Nadi monitored Gene as the 12th tropical disturbance, as well as the fourth tropical cyclone and the third severe tropical cyclone to form west of 160ºE during the 2007–08 South Pacific cyclone season. Gene was also recognised by RSMC Nadi as the fifth tropical cyclone and fourth severe tropical cyclone to form within the South Pacific Ocean during the 2007-08 season.
Tropical Cyclone Tam was the first named storm of the 2005–06 South Pacific cyclone season. Forming out of a tropical depression on January 6, the storm gradually intensified, becoming a tropical cyclone on January 12 and receiving the name Tam. Although it was traveling at a quick pace, the storm gained organization and reached its peak intensity with winds of 85 km/h (53 mph) the following day. However, the increasing forward motion of the storm, combined with strengthening wind shear, caused Tam to rapidly weaken on January 14. Around that time, it entered the Tropical Cyclone Warning Centre in Wellington, New Zealand's area of responsibility. Shortly thereafter, the storm transitioned into an extratropical cyclone and dissipated early the next day. Cyclone Tam produced heavy rainfall and strong winds over American Samoa upon being named. The precipitation caused several mudslides and flooding, which inflicted $26,000 in damage. The storm also had minor effects on Niue, Tonga, and Futuna.
The 2009–10 South Pacific cyclone season began on December 3, 2009 with the formation of Tropical Disturbance 01F, 32 days after the cyclone season had officially begun on November 1, 2009. The season ended on April 30, 2010. These dates conventionally delimit the period of each year when most tropical cyclones form in the southern Pacific Ocean east of 160°E. Additionally, the regional tropical cyclone operational plan defines a tropical cyclone year separately from a tropical cyclone season; the "tropical cyclone year" began on July 1, 2009 and ended on June 30, 2010. Tropical cyclones between 160°E and 120°W and north of 25°S are monitored by the Fiji Meteorological Service. Those that move south of 25°S are monitored by the Tropical Cyclone Warning Centre in Wellington, New Zealand. The first tropical disturbance of the season formed on December 3, about 1015 km (700 mi) to the north of Suva, Fiji and later intensified into Tropical Cyclone Mick. The last system, 15F, dissipated on April 5 of the following year.
The 1996–97 South Pacific cyclone season was one of the most active and longest South Pacific tropical cyclone seasons on record, with 12 tropical cyclones occurring within the South Pacific basin between 160°E and 120°W. The season officially ran from November 1, 1996 - April 30, 1997, however, the season ended later than normal with three systems monitored after the official end of the season. The strongest tropical cyclone of the season was Cyclone Gavin which had a minimum pressure of 925 hPa (27.32 inHg). After the season had ended 4 tropical cyclone names were retired from the naming lists, after the cyclones had caused significant impacts to South Pacific islands.
The 2010–11 South Pacific cyclone season was an average tropical cyclone season, with seven tropical cyclones and five severe tropical cyclones developing during the season. The season ran from November 1, 2010, until April 30, 2011, though if any tropical cyclones had developed between July 1, 2010, and June 30, 2011, the official tropical cyclone year, they would have been counted towards the season's total. Within the South Pacific basin tropical cyclones were officially monitored by the Fiji Meteorological Service's Regional Specialized Meteorological Center in Nadi, Fiji, north of 25°S, and to the south the Meteorological Service of New Zealand's Tropical Cyclone Warning Center in Wellington, New Zealand. Any disturbances forming in the region were designated with a sequential number suffixed by the letter F. In addition, the United States Military's Joint Typhoon Warning Center unofficially monitored parts of the basin during the season, where any systems judged to have achieved tropical storm strength or greater received a number suffixed with the letter P. RSMC Nadi and TCWC Wellington both use the Australian Tropical Cyclone Intensity Scale, and measure wind speeds over a period of ten minutes, while the JTWC measures sustained winds over a period of one minute which can be applied to the Saffir–Simpson hurricane scale. Seven named storms formed or moved into the South Pacific basin during the 2010–11 season, the strongest of which was Severe Tropical Cyclone Wilma in late January.
The 2011–12 South Pacific cyclone season was one of the least active South Pacific tropical cyclone seasons on record, with only three tropical cyclones occurring during the season. The season ran from November 1, 2011, to April 30, 2012, however, any tropical cyclones that form before June 30, 2012, would have fallen within the 2011–12 tropical cyclone year and would have counted towards the season total. The strongest and only severe tropical cyclone that occurred during the season was Severe Tropical Cyclone Jasmine, which tracked in from out of the South Pacific basin. Within the basin, tropical cyclones are monitored by the Regional Specialized Meteorological Center (RSMC) in Nadi, Fiji, and the Tropical Cyclone Warning Center (TCWC) in Wellington, New Zealand. RSMC Nadi attaches an F designation to tropical disturbances that form in or move into the South Pacific. The United States Joint Typhoon Warning Center (JTWC) issues unofficial warnings within the South Pacific, designating tropical storm-equivalent or greater tropical cyclones with a number and a P suffix. RSMC Nadi and TCWC Wellington both use the Australian Tropical Cyclone Intensity Scale, and measure windspeeds over a period of ten minutes, while the JTWC measures sustained winds over a period of one minute and uses the Saffir–Simpson hurricane scale.
The 2012–13 South Pacific cyclone season was a below average tropical cyclone season, with five tropical cyclones occurring within the basin between 160°E and 120°W. The season officially ran from November 1, 2012, to April 30, 2013, however the last tropical disturbance was last noted on May 1, as it moved into the subtropics. During the season, tropical cyclones were officially monitored by the Fiji Meteorological Service (FMS), Australian Bureau of Meteorology (BoM) and New Zealand's MetService. The United States Joint Typhoon Warning Center (JTWC) and other national meteorological services including Météo-France and NOAA also monitored the basin during the season. During the season there were 22 significant tropical disturbances assigned a number and a F suffix by the FMS's Regional Specialized Meteorological Center in Nadi, Fiji (RSMC Nadi), including Severe Tropical Cyclone Sandra which moved into the basin from the Australian region on March 9. The BoM, MetService and RSMC Nadi all estimated sustained wind speeds over a period of 10-minutes and used the Australian tropical cyclone intensity scale, while the JTWC estimated sustained winds over a 1-minute period, which are subsequently compared to the Saffir–Simpson hurricane wind scale (SSHS).
Tropical Cyclone Vania was the third depression and first tropical cyclone of the 2010–11 South Pacific cyclone season.
Severe Tropical Cyclone Wilma was a powerful tropical cyclone that affected the Samoan Islands, Tonga and New Zealand. Forming out of a trough of low pressure on 19 January 2011 to the northwest of Fiji, Cyclone Wilma initially tracked eastward towards the Samoan Islands. On 22 January, the system took a sharp southward turn, bringing its centre directly over American Samoa the following day. After turning towards the southwest and accelerating, Wilma steadily intensified into a severe tropical cyclone before striking Tonga. The storm reached its peak intensity on 26 January as a Category 4 cyclone with winds of 185 km/h (115 mph) and a barometric pressure of 930 mbar. Gradually re-curving towards the southeast, Wilma weakened quickly as it moved over cooler sea surface temperatures; by 28 January, it was downgraded to a tropical cyclone. Later that day, the storm brushed the North Island of New Zealand before transitioning into an extratropical cyclone.
The 2013–14 South Pacific cyclone season was a slightly below average tropical cyclone season, with six tropical cyclones occurring within the basin between 160°E and 120°W. The season ran from November 1, 2013, to April 30, 2014, however, the first four tropical disturbances occurred during October 2013 and were included as a part of the season. During the season, tropical cyclones were officially monitored by the Fiji Meteorological Service (FMS), Australian Bureau of Meteorology (BoM) and New Zealand's MetService. The United States Joint Typhoon Warning Center (JTWC) and other national meteorological services including Météo-France and NOAA also monitored the basin during the season. During the season there were 21 significant tropical disturbances were assigned a number and an "F" suffix by the FMS's Regional Specialized Meteorological Center in Nadi, Fiji (RSMC Nadi), including the remnants of Tropical Cyclone Hadi from the Australian region. The BoM, MetService and RSMC Nadi all estimated sustained wind speeds over a period of 10-minutes and used the Australian tropical cyclone intensity scale, while the JTWC estimated sustained winds over a 1-minute period, which are subsequently compared to the Saffir–Simpson hurricane wind scale (SSHS).
The 2014–15 South Pacific cyclone season was a slightly-below average tropical cyclone season, with five tropical cyclones occurring within the basin between 160°E and 120°W. The season officially ran from November 1, 2014, to April 30, 2015. During the season, tropical cyclones were officially monitored by the Regional Specialized Meteorological Center (RSMC) in Nadi, Fiji and the Tropical Cyclone Warning Centers in Brisbane, Australia and Wellington, New Zealand. The United States Armed Forces through the Joint Typhoon Warning Center (JTWC) also monitored the basin and issued unofficial warnings for American interests. RSMC Nadi attaches a number and an F suffix to tropical disturbances that form in or move into the basin while the JTWC designates significant tropical cyclones with a number and a P suffix. RSMC Nadi, TCWC Wellington and TCWC Brisbane all use the Australian Tropical Cyclone Intensity Scale and estimate windspeeds over a period of ten minutes, while the JTWC estimated sustained winds over a 1-minute period, which are subsequently compared to the Saffir–Simpson hurricane wind scale (SSHWS).
Severe Tropical Cyclone Ron was the strongest tropical cyclone on record to impact Tonga. The system was first noted as a tropical depression, to the northeast of Samoa on January 1, 1998. Over the next day the system gradually developed further and was named Ron as it developed into a Category 1 tropical cyclone on the Australian tropical cyclone intensity scale during the next day. The system subsequently continued to move south-westwards and became a Category 3 severe tropical cyclone, as it passed near Swains Island during January 3.
The 2015–16 South Pacific cyclone season was one of the most disastrous South Pacific tropical cyclone seasons on record, with a total of 50 deaths and $1.405 billion in damage. Throughout the season, 8 systems attained tropical cyclone status, whilst 5 became severe tropical cyclones. The most notable cyclone of the season by far was Winston, which attained a minimum pressure of 884 hPa, and maximum ten-minute sustained winds of 175 mph (280 km/h), making it the most intense tropical cyclone on record in the Southern Hemisphere. Winston went on to devastate Fiji, causing $1.4 billion in damage and 44 deaths across the country.
The 2017–18 South Pacific cyclone season was a slightly below-average season that produced 6 tropical cyclones, 3 of which became severe tropical cyclones. The season officially began on November 1, 2017, and ended on April 30, 2018; however, a tropical cyclone could form at any time between July 1, 2017, and June 30, 2018, and would count towards the season total. During the season, tropical cyclones were officially monitored by the Fiji Meteorological Service, MetService and the Australian Bureau of Meteorology, while the United States Joint Typhoon Warning Center (JTWC) also monitored the basin and issued warnings for American interests. The FMS attaches a number and an F suffix to significant tropical disturbances that form in or move into the basin, while the JTWC designates significant tropical cyclones with a number and a P suffix. The BoM, FMS and MetService all use the Australian Tropical Cyclone Intensity Scale and estimate wind speeds over a period of ten minutes, while the JTWC estimates sustained winds over a 1-minute period, which are subsequently compared to the Saffir–Simpson hurricane wind scale (SSHWS).
Severe Tropical Cyclone Gavin was the most intense tropical cyclone to affect Fiji, since 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.
Severe Tropical Cyclone Freda was an intense tropical cyclone that developed during the 2012–13 South Pacific cyclone season and affected New Caledonia and the Solomon Islands as a weak tropical cyclone. The system that was to become Cyclone Freda was first classified on 26 December 2012, as a tropical disturbance. It gradually developed and was classified as a tropical cyclone and named Freda as it passed through the Solomon Islands on 28 December.
Severe Tropical Cyclone Amos was a strong tropical cyclone that affected the Fijian and Samoan Islands as well as Wallis and Futuna. Amos was first noted as Tropical Disturbance 17F during April 13, 2016 to the northwest of Fiji. The system subsequently moved south-eastwards towards the Fijian Islands, before it passed near or over Vanua Levu during April 16. After passing over Fiji, the system gradually developed further as it moved north-eastwards towards the Samoan Islands. The system was subsequently named Amos during April 20, after it had developed into a tropical cyclone and started to move north-westwards towards the island nation of Tuvalu.