Meteorological history | |
---|---|
Formed | January 1,1998 |
Dissipated | January 9,1998 |
Category 5 severe tropical cyclone | |
10-minute sustained (FMS) | |
Highest winds | 230 km/h (145 mph) |
Lowest pressure | 900 hPa (mbar);26.58 inHg |
Category 5-equivalent tropical cyclone | |
1-minute sustained (SSHWS/NPMOC) | |
Highest winds | 270 km/h (165 mph) |
Overall effects | |
Fatalities | None |
Damage | $566,000 (1998 USD) |
Areas affected | Samoan Islands,Tonga,Wallis and Futuna |
IBTrACS | |
Part of the 1997–98 South Pacific cyclone season |
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.
Intensification proceeded at a fairly rapid rate. Ron reached the peak intensity of 145 mph (225 km/h) on January 5,becoming one of the most intense cyclones in the Southern hemisphere in that decade,when Ron was at north-northwest of Apia,Samoa,three days after initial development. The cyclone maintained this strength for about 36 hours,while re-curving to the south-southeast. Then,Ron started weakening while passing between central Tonga and Niue on January 7. Finally,by January 9,Ron was absorbed by the much larger circulation of Severe Tropical Cyclone Susan.
Towards the end of December 1997, an area of low pressure developed within the South Pacific Convergence Zone to the northwest of the Cook Islands. [1] Over the next few days, the system gradually developed further, before it was classified as a tropical depression by the Fiji Meteorological Service (FMS) during January 1, 1998. [2] The system subsequently moved south-westwards under the influence of an area of high pressure and gradually developed further as its organisation and outflow improved. [3] [4] During the next day the FMS reported that the system had developed into a Category 1 Tropical Cyclone, on the Australian Tropical Cyclone Intensity Scale and named it Ron. [2] At around the same time the Naval Pacific Meteorology and Oceanography Center initiated advisories on the system, and designated it as Tropical Cyclone 10P with 1-minute wind speeds of 65 km/h (40 mph). [4] During that day the system continued to move south-westwards and gradually organized further and became a Category 3 Severe Tropical Cyclone during January 3, as it passed about 20 km (10 mi) to the north of Swains Island. [2] [5] [6]
After passing to the north of Swains Island, Ron continued to intensify and developed an eye as it moved south-westwards, before RSMC Nadi reported that it had become a Category 5 Severe Tropical Cyclone at 00:00 UTC on January 5. [5] [7] RSMC Nadi subsequently reported six hours later that the system had peaked with estimated 10-minute sustained wind-speeds of 145 mph (225 km/h) and an estimated minimum pressure of 900 hPa (26.58 inHg). [2] [5] At this time the system was located to the northeast of Wallis Island and was thought to be the strongest tropical cyclone in the South Pacific Basin since Severe Tropical Cyclone Hina of the 1984-85 season. [8] The NPMOC subsequently reported that the system had peaked as a category 5 hurricane on the Saffir–Simpson hurricane wind scale, with 1-minute sustained wind speeds of 165 mph (270 km/h) and an estimated minimum pressure of 892 hPa (26.34 inHg). [9] [5]
As the system peaked in intensity during January 5, the system recurved towards the southeast and passed about 55 km (35 mi) to the east of Wallis Island. [5] During the next day Ron remained at it peak intensity before it passed, about 30 km (20 mi) to the east of the Tongan island of Niuafo'ou. [2] [5] During January 7, the system started to weaken as it accelerated southeastwards, and passed in between the main Tongan islands and Niue. [8] The system subsequently moved below 25S and left the tropics during the next day, before Ron was last noted being absorbed by Severe Tropical Cyclone Susan during January 9. After absorbing Ron, Susan transitioned into an extra-tropical cyclone, before it was last noted during January 10, bringing an unseasonable cold snap to New Zealand. [5] [2] [10]
Severe Tropical Cyclone Ron caused no deaths and various levels of damage, as it affected Swains Island, Wallis and Futuna and Tonga, while the name Ron was retired from the Lists of tropical cyclone names for the region due to the impact of this system. [2] [11] Between January 2–3, Swains Island became the first island to be affected by Ron, with severe impacts to structures reported on the island from winds of up to 145 km/h (90 mph). [2] [12] There were no deaths or damages reported on the island, after the 49 residents took shelter in a concrete structure. [13] [14]
The system became the fourth and final tropical cyclone to affect the French territory of Wallis and Futuna during 1997 and 1998, after cyclones Gavin, Hina and Keli had affected the islands. [15] [16] Ahead of the system affecting the islands between January 4–6, residents were put on maximum alert for the system by the local disaster management centre. [16] [17] [18] As a result, residents were urged to stock up with food and water, while a crisis centre was set up in the capital Mata-Utu and Air Calédonie cancelled flights to the islands. [19] [20] On the island of Wallis winds of up to 130 km/h (80 mph), and a rainfall total of 109 mm (4.3 in) were recorded in the Hihifo District on January 6. [16] Widespread damage to roofs, trees, coastal roads, fales and food crops were recorded while water, electricity supplies and communication network were also disrupted. [16] [18] [20] Residents of the island of Futuna evacuated inland and sought higher ground as tidal waves of between 7–9 metres (23–30 ft) affected the island. [18] [20] [21]
Ron was the first tropical cyclone to prompt the FMS to issue a gale warning for Niue, since Cyclone Ofa impacted the island in February 1990. [22] The system passed about 325 km (200 mi) to the west of Niue at around 19:00 UTC (07:00 Niue Time) on January 7, where intermittent showers, average winds of 35 km/h (20 mph), a minimum pressure of 1005 hPa (29.68 inHg) were recorded. [22]
After affecting both Wallis and Futuna and Swains Island, the system became the strongest tropical cyclone on record in Tonga, as it passed near Niuafo'ou at peak intensity. [2] [23] The system was the third tropical cyclone to affect the island nation in 10 months, after cyclones Hina and Keli affected the islands in March and June 1997, respectively. [24] Ahead of the system affecting the islands tropical cyclone alerts and warnings were issued for the whole nation by the Tonga Meteorological Department. [25] The worst affected Tongan island was Niuafo'ou where considerable damage occurred, while some damage was reported on other islands including Niuatoputapu, Tafahi, and Vava'u. [2]
On the island of Niuafo'ou sustained winds of 110 km/h (70 mph) were reported, while it was estimated that winds on the island had peaked at between 125–145 km/h (80–90 mph). [8] During the system's aftermath, a survey team was sent to Niuafoou, Niuatoputapu and Tafahi to assess the damage and the impact of the cyclone on the inhabitants. [26] According to the report made by them, the cyclone left 99 families without home and 43 ones in need of tarpaulins to repair damages, most of them in the Niuafo'ou island. [26] Also, Ron's winds caused extensive damage to agriculture and vegetation of the islands, in which includes total loss of fruit and breadfruit trees and severe damage to cassava and banana crops. [26]
Ron's destructive winds caused severe damage in Tonga's sanitation systems, increasing the danger of an outbreak of infectious diseases. Approximately 30% of the water tanks and 95% of the catchment covers had been damaged, leading to a water shortage. [27] Also, according to Tonga's National Disaster Relief Committee, the great loss of plantations and vegetation led to a six-month food shortage. [28] Replanting programmes took up to 6–8 months to restore all the lost vegetation. [27]
Several governments and organizations assisted the people affected by Ron. The Office for the Coordination of Humanitarian Affairs as allocated an Emergency Cash Grant of US$20,000 of relief items and coverage of transportation costs. The Government of New Zealand has provided temporary shelters and assistance with repairs to Government and public health buildings, as well as assistance with replanting with a total value of NZ$36,500 (approximately US$21,340). The United Kingdom provided supplies for the repair of water and sanitary systems of a total value of approximately £15,000 (US$25,000). [26] The South Pacific Forum Secretariat in Fiji also helped Tonga, releasing US$10,000 from a special disaster fund. [29]
Severe Tropical Cyclone Heta was a Category 5 tropical cyclone that caused moderate damage to the islands of Tonga, Niue, and American Samoa during late December 2003 and early January 2004. Heta formed on December 25, 2003; it reached a maximum intensity of 260 km/h (160 mph) and an estimated pressure of 915 hPa before dissipating on January 11, 2004. It was the first named tropical cyclone to form during the 2003–04 South Pacific cyclone season.
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 1997–98 South Pacific cyclone season was the most active South Pacific tropical cyclone season on record, with 16 tropical cyclones occurring within the South Pacific basin between 160°E and 120°W. The season started earlier than normal with 3 systems developing before the official start of the season on November 1, 1997, while the final system of the season dissipated on May 3, 1998, after the season had officially ended on April 30. During the season 50 people died as a result of tropical cyclones, with the deadliest being Cyclone Martin with 27 known deaths. The strongest tropical cyclones during the season were Cyclone Ron and Cyclone Susan as both were estimated to have minimum pressures of 900 hectopascals (26.6 inHg), and were the most intense tropical cyclones on record in the South Pacific Ocean until Cyclone Zoe in 2002–03. After the season ended, 11 names had their names either removed or retired from the lists of names, after they caused significant impacts to South Pacific islands.
The 2005–06 South Pacific cyclone season was an event in the annual cycle of tropical cyclone formation. It began on November 1, 2005, and ended on April 30, 2006. 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, 2005, to June 30, 2006.
The 2002–03 South Pacific cyclone season was the most active and longest tropical cyclone season since 1997–98, with ten tropical cyclones occurring within the South Pacific basin between 160°E and 120°W. The season started earlier than normal, with two systems developing before the official start of the season on November 1, 2002, while the final system dissipated on June 9, 2003, after the season had officially ended on April 30. During the season, tropical cyclones were officially monitored by the Regional Specialized Meteorological Centre (RSMC) in Nadi, Fiji and the Tropical Cyclone Warning Centres 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 occur within 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 ten-minute period, while the JTWC estimates sustained winds over a one-minute period, which are subsequently compared to the Saffir–Simpson Hurricane Scale (SSHS).
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 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.
Severe Tropical Cyclone Keli was the first recorded post-season tropical cyclone to form in June within the South Pacific Ocean. The system formed on June 7, 1997, about 460 kilometers (285 mi) to the north of Tokelau. The depression gradually developed over the next few days while moving southwestward. It was designated as Tropical Cyclone Keli early the next day. Cyclone Keli intensified, slowly reaching its 10-minute peak wind speeds of 150 km/h (90 mph), which made it a Category 3 severe tropical cyclone on the Australian Tropical Cyclone Intensity Scale. As it came under the influence of strong mid latitude westerlies and moved into an area of strong vertical wind shear, the cyclone started to weaken and was declared extratropical on June 15.
Severe Tropical Cyclone Vaianu was the fourth named tropical cyclone of the 2005–06 South Pacific cyclone season. The system formed on February 11, and moved generally towards the south throughout its life. Vaianu ultimately peaked with winds corresponding to Category 1 status on the Saffir-Simpson Hurricane Scale, and passed between Fiji and Tonga. Moving into cooler waters, the storm dissipated on February 16. Although the cyclone avoided land for the most part, it caused heavy rainfall and gusty winds in portions of Tonga. Flooding hit the capital city of Nuku'alofa, and on some islands, the storm destroyed crops.
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).
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).
Severe Tropical Cyclone Nina was a significant tropical cyclone which impacted six island nations from December 1992 to January 1993. The system was first noted as a tropical low over the Cape York Peninsula on 21 December. Over the next few days the system moved south-westwards and moved into the Gulf of Carpentaria where it was named Nina, after it had developed into a tropical cyclone during 23 December. The system was subsequently steered south-eastwards by an upper level trough of low pressure, before it made landfall as a Category 2 tropical cyclone on the Cape York Peninsula near Cape Keerweer on 25 December. Over land the system weakened into a tropical low before it regenerated into a tropical cyclone over the Coral Sea on 28 December. The system subsequently moved north-eastwards, under the influence of Severe Tropical Cyclone Kina and an upper level ridge of high pressure. During 1 January 1993, Nina peaked with sustained wind speeds of 140 km/h (85 mph), as it affected Rennell, Bellona and Temotu provinces in the Solomon Islands. The system subsequently gradually weakened as it accelerated eastwards and affected Rotuma, Wallis and Futuna, Tonga and Niue. Nina was subsequently absorbed by Kina, while both systems were located near the Southern Cook Islands during 5 January.
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 Ofa was a powerful tropical cyclone that caused severe damage in Polynesia in February 1990. The system was first noted on January 27, 1990, near Tuvalu, as a shallow tropical depression that had developed within the South Pacific Convergence Zone. The cloud pattern slowly organized, and on January 31, while located east of Tuvalu, Ofa attained cyclone intensity. Moving slowly southeast, Ofa developed storm-force winds. It attained hurricane-force winds on February 2. Cyclone Ofa reached peak intensity on February 4. Shortly after, its peak Ofa began to weaken over a less favourable environment. Ofa was declared an extratropical cyclone on February 8, though the system was still tracked by meteorologists until February 10.
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 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).
The 2018–19 South Pacific cyclone season was a below-average season that produced 5 tropical cyclones, 2 of which became severe tropical cyclones. The season officially runs from November 1, 2018, to April 30, 2019; however, a tropical cyclone could have formed at any time between July 1, 2018, and June 30, 2019, and would count towards the season total. During the season, tropical cyclones were officially monitored by the Fiji Meteorological Service, Australian Bureau of Meteorology, and New Zealand's MetService. The United States Armed Forces through the Joint Typhoon Warning Center (JTWC) also monitored the basin and issued 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. The FMS, the BoM 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 Hina in March 1997 was the worst tropical cyclone to affect the South Pacific island nation of Tonga since Cyclone Isaac in 1982. The system was first noted within the monsoon trough on March 11, 1997, as a weak shallow depression within the vicinity of Rotuma. Over the next two days, the depression remained near Rotuma with no preferred movement, as it started to develop further within favorable conditions for further development. The system was subsequently named Hina on March 15, after it had started to move eastwards and had passed to the southeast of Niulakita, Tuvalu. During that day the system moved south-eastwards and impacted Wallis and Futuna, before it passed over Tonga's southern islands of Tongatapu and 'Eua during March 16. After impacting Tonga the system moved rapidly towards the south-southeast and weakened below tropical cyclone intensity, before it was last noted on March 21 about 1,500 km (930 mi) to the south of the Pitcairn Islands. During the system's post-analysis, it was determined that the warning centers had underestimated Hina's intensity as it passed over Tonga, after damage in the island nation had been greater than expected.
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.
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