Cyclone Gita

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Gita 3
Current storm status
Category 3 severe tropical cyclone (Australian scale)
Current storm status
Tropical storm (1-min mean)
Gita Geostationary VIS-IR 2018.png
Satellite image
JTWC sh0918.gif
Forecast map
As of:
07:00 NZDT (18:00 UTC), February 17
Location: 26°06′S 164°00′E / 26.1°S 164.0°E / -26.1; 164.0 (Gita)
122 nmi (226 km; 140 mi) SSE of Nouméa, New Caledonia
Sustained winds: 120 km/h (75 mph) (10-min mean)
110 km/h (70 mph) (1-min mean)
gusting to 135 km/h (85 mph)
Pressure: 970 hPa (mbar; 28.64 inHg)
Movement: SW at 10 kn (19 km/h; 12 mph)
See more detailed information.

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 February 3, 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 February 9 near Samoa. Arcing south in a clockwise turn, the system rapidly intensified and became a severe tropical cyclone on February 10 near Niue.

Throughout its path in the South Pacific, Cyclone Gita affected multiple island nations and territories. Tonga was 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 Fijian Lau Islands were significantly affected, particularly Ono-i-Lau and Vatoa. Wallis and Futuna, Niue, and Vanuatu were also affected but impacts in these areas were minor.

Meteorological history[edit]

Map plotting the track and intensity of the storm, according to the Saffir–Simpson scale

On February 3, 2018, the Fiji Meteorological Service (FMS) started to monitor Tropical Disturbance 07F, which had developed within a trough of low pressure, about 435 km (270 mi) to the southeast of Honiara in the Solomon Islands.[1][2] The system was poorly organised and was located along an upper-level ridge of high pressure in an area of high vertical wind shear.[2] Over the next couple of days the system moved erratically near northern Vanuatu and remained poorly organised, with atmospheric convection located to the south of the low level circulation.[3] The system subsequently started to move south-eastwards, towards the Fijian Islands and a favourable environment for further development during February 5.[4] The system subsequently passed near the island nation during February 8, where it developed into a tropical depression and started to move north-eastwards towards the Samoan Islands.[5][6] During February 9, the United States Joint Typhoon Warning Center (JTWC) initiated advisories on the system and designated it as Tropical Cyclone 09P, after an ASCAT image showed that it had winds of 65–75 km/h (40–45 mph) in its northern semi-circle.[7] The FMS subsequently named the system Tropical Cyclone Gita early, after the United States National Weather Service Weather Forecast Office in Pago Pago requested that the system be named early for warning and humantarian reasons.[8]

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 100 km (60 mi) 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.[9] On February 10, Gita rapidly intensified to a category 3 severe tropical cyclone on the Australian scale[10] while traversing anomalously warm sea surface temperatures of between 28–29 °C (82–84 °F).[11] On February 11, Gita continued to intensify into a category 4 severe tropical cyclone.[12] At the same time, Gita turned westward under the influence of a subtropical ridge to the south.[9] At approximately 10:00 UTC (23:00 TOT) on February 11, the cyclone passed about 30 km (20 mi) south of Tongatapu near its peak intensity, as a powerful Category 4 cyclone on both scales; the RSMC Nadi-based Australian scale and the JTWC-used Saffir–Simpson scale, with maximum 10-minute sustained winds of 200 km/h (120 mph). At the same time, the Joint Typhoon Warning Center estimated peak 1-minute sustained winds at 230 km/h (145 mph).[13] This made Gita the strongest cyclone to strike Tonga in its recorded history.[14]

Current storm information[edit]

As of 07:00 NZDT (18:00 UTC) February 17, Severe Tropical Cyclone Gita is located near 26°06′S 164°00′E / 26.1°S 164.0°E / -26.1; 164.0 (Gita), about 122 kilometres (76 miles) south-southeast of Nouméa, New Caledonia. 10-minute sustained winds are at 120 km/h (75 mph), while 1-minute sustained winds are at 110 km/h (70 mph), with gusts of up to 150 km/h (90 mph). The minimum barometric pressure is at 970 hectopascals (28.64 inHg), and the system is moving southwestwards at 10 knots (19 km/h; 12 mph).

For latest official information, see:

Preparations and impact[edit]

Severe Tropical Cyclone Gita impacted the Pacific island nations of Vanuatu, Fiji, Wallis and Futuna, Samoa, American Samoa, Niue and Tonga, with the most significant damage being reported in the Samoan Islands and Tonga. As Gita's precursor tropical disturbance impacted Vanuatu's Torba province during February 6, the Vanuatu Meteorology and Geohazards Department warned that heavy rainfall, thunder and lighting would impact the area and advised people to take extra precautions.[15] Between February 8 and 9, the system brought strong winds and heavy rain to Wallis and Futuna. Some power outages were reported on Wallis, though overall effects were negligible.[16] During the cyclone's westward turn, it brought significant winds to Niue; however, no damage occurred.[17]

Samoa[edit]

Global Precipitation Measurement enhanced satellite image of Cyclone Gita near the Samoan islands on February 9. Heavy rain bands with rainfall rates of 25 to 41 mm (1 to 1.6 in) per hour were identified near the islands.

Cyclone Gita brought torrential rain to parts of Samoa on February 8–9.[18] Hardest hit were areas in and around Apia where more than 350 mm (14 in) of rain fell during the overnight hours.[19] Multiple rivers in the city burst their banks and inundated homes.[20] At least 233 people sought refuge in emergency shelters.[18] Landslides and flooding rendered many roads impassable.[21] Communications were briefly lost with the southern coast of Upolu.[20] A state of disaster was declared for the nation on February 10.[20]

American Samoa[edit]

In the two days preceding Gita's arrival, an associated monsoon trough produced significant rains, reaching 432 mm (17.0 in) across parts of American Samoa.[16] Multiple streams flooded and prompted evacuations in Malaeloa village. Landslides were reported in Avau, Amanave, and Poloa.[22] Cyclone Gita reached American Samoa on February 9, bringing heavy rains and strong winds; homes were damaged on Nu'uuli, Tafuna, and Tutuila.[23] High winds tore roofs of structures and downed trees and power lines.[24] Approximately 90 percent of Tutuila was left without power and water.[25] The local National Weather Service office in Pago Pago lost power; the Honolulu, Hawaii, office issued forecasts in the interim.[24] Rainfall in Pago Pago exceeded 155 mm (6 in).[19] More than 800 people were displaced from their homes across the territory.[24] Pago Pago International Airport suspended operations for the duration of the storm. A Coast Guard AC-130 conducted aerial surveys of the territory and a small group of Federal Emergency Management Agency (FEMA) personnel were deployed.[26] United States President Donald Trump declared a state of emergency for American Samoa on February 11.[27] Health officials advised residents to boil water amid an enhanced risk of dengue fever.[24]

Tonga[edit]

Prior to and during the cyclone, approximately 5,700 residents sought refuge in public shelters.[28][29] Power was turned off prior to the storm's arrival.[29] Striking Tonga on February 12, Cyclone Gita brought destructive winds to the capital island of Tongatapu.[14] Initial surveys across the island revealed 119 homes destroyed and another 1,131 damaged,[30] primarily in Nukuʻalofa.[31] Many areas were left without water and power.[14] Many structures lost their roof during the height of the storm.[28] Older structures suffered the greatest damage, including the Tongan Parliament building, built more than 100 years ago, which was flattened by the storm.[28][29] Fuaʻamotu International Airport sustained damage, prompting officials to keep the airport closed. Across Tongatapu, 3 people suffered major injuries while another 30 experienced minor injuries.[32] An elderly woman died while trying to find shelter after her home was destroyed.[33] One person died from a heart attack potentially related to the storm in Fuaʻamotu.[32]

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.[32] Fifty-two homes were completely destroyed on the island; eight people suffered injury, including one severe.[30]

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 February 13. National Emergency Management Office spokesman Graham Kenna called the storm "the worst situation [he has] been in" during his 30-year career.[32] MP Lord Fusituʻa described the impact as the worst since at least Cyclone Isaac in 1982.[33] On February 13, Australia provided A$350,000 (US$275,000) in emergency supplies via the Royal Australian Air Force (RADF) 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.[34] New Zealand provided NZ$750,000 (US$545,000) in assistance.[29]

Fiji[edit]

On February 13, the center of Gita passed roughly 60 km (37 mi) south of Ono-i-Lau in the Lau Islands of Fiji.[35] Observations from the island revealed peak sustained winds of 126 km/h (78 mph) with gusts to 156 km/h (97 mph).[36] Flooding from tidal surge preceded the core of the cyclone by several hours.[37] Structural damage was reported in Doi Village, including one home that lost its roof.[38] Communications with Ono-i-Lai and nearby Vatoa were disrupted for roughly a day.[39][31] Across both islands, 10 homes were destroyed and 26 more sustained damage.[40] Many structures sustained roof damage and crops were devastated.[31] Local leaders on Ono-i-Lau called the storm the "worst in living memory".[41]

New Caledonia[edit]

In advance of the storm, most tourists visiting the Isle of Pines, southeast Grande Terre, were evacuated to Nouméa; however, many stayed to ride out the storm. Municipal buildings were opened to the public as shelters. All businesses suspended operations on February 16.[42]

See also[edit]

References[edit]

  1. ^ "Rain continues and heavy rain warning remains" (PDF) (Press release). Fiji Meteorological Service. February 3, 2018. Retrieved February 14, 2018. 
  2. ^ a b RSMC Nadi — Tropical Cyclone Centre (February 3, 2018). "Tropical Disturbance Summary February 3, 2018 09z". Fiji Meteorological Service. Archived from the original on February 3, 2018. Retrieved February 12, 2018. 
  3. ^ RSMC Nadi — Tropical Cyclone Centre (February 5, 2018). "Tropical Disturbance Summary February 5, 2018 09z". Fiji Meteorological Service. Archived from the original on February 5, 2018. Retrieved February 12, 2018. 
  4. ^ "TD08F remains slow moving" (PDF) (Press release). Fiji Meteorological Service. February 5, 2018. Retrieved February 14, 2018. 
  5. ^ "Heavy rain and strong winds to ease as TD07F moves away" (PDF) (Press release). Fiji Meteorological Service. February 8, 2018. Retrieved February 14, 2018. 
  6. ^ RSMC Nadi — Tropical Cyclone Centre (February 8, 2018). "Tropical Disturbance Advisory Numver A1". Fiji Meteorological Service. Archived from the original on February 8, 2018. Retrieved February 14, 2018. 
  7. ^ Joint Typhoon Warning Center (February 9, 2018). "Tropical Cyclone Warning". Pearl Harbor HI: Government of the United States. Archived from the original on February 8, 2018. Retrieved February 14, 2018. 
  8. ^ RSMC Nadi — Tropical Cyclone Centre (February 9, 2018). "Tropical Disturbance Advisory February 9, 2018 06z". Fiji Meteorological Service. Archived from the original on February 9, 2018. Retrieved February 12, 2018. 
  9. ^ a b "Overall Red alert Tropical Cyclone for GITA-18". GDACS. Joint Typhoon Warning Center. Retrieved 13 February 2018. 
  10. ^ "HURRICANE WARNING 017". WebCite. RSMC Nadi. Archived from the original on February 13, 2018. Retrieved 13 February 2018. 
  11. ^ Henson, Bob. "Eyewall of Fearsome Cyclone Gita Churns across Tonga". Weather Underground. Retrieved 13 February 2018. 
  12. ^ "HURRICANE WARNING 024". WebCite. RSMC Nadi. Archived from the original on February 13, 2018. Retrieved 13 February 2018. 
  13. ^ "Tropical Cyclone Gita is a monster Category 4, Nuku'alofa badly battered". Samoa News. Radio New Zealand. Retrieved 13 February 2018. 
  14. ^ a b c Tapaleao, Vaimoana; Dunlop, Ryan (February 13, 2018). "Gita's fury: Tropical cyclone hits Tonga and there are now fears for parts of Fiji". New Zealand Herald. Retrieved February 13, 2018. 
  15. ^ Daniel, Brenda (February 6, 2018). "Heavy rainfall expected in Torba province". The Vanuatu Independent News Magazine. Archived from the original on February 13, 2018. Retrieved February 12, 2018. 
  16. ^ a b "Depression heading towards Samoa expected to become cyclone". Radio New Zealand. February 9, 2018. Retrieved February 13, 2018. 
  17. ^ "Niue spared as Cyclone Gita picks up strength". Radio New Zealand. February 11, 2018. Retrieved February 13, 2018. 
  18. ^ a b "Widespread flooding in Samoa as Cyclone Gita leaves its mark". TVNZ. February 9, 2018. Retrieved February 13, 2018. 
  19. ^ a b Leister, Eric (February 13, 2018). "Tropical Cyclone Gita leaves trail of destruction from American Samoa to Tonga". AccuWeather. Retrieved February 13, 2018. 
  20. ^ a b c "Damage after Cylcone Gita". Samoa News. Radio New Zealand. February 10, 2018. Retrieved February 13, 2018. 
  21. ^ "Samoa assesses damage as Cyclone Gita, now a category 2, strengthens". Radio New Zealand. February 10, 2018. Retrieved February 13, 2018. 
  22. ^ "Homes evacuated amid flooding in American Samoa". Radio New Zealand. February 8, 2018. Retrieved February 13, 2018. 
  23. ^ Sagapolutele, Fili (February 11, 2018). "Red Cross damage assessment info". Samoa News. Retrieved February 13, 2018. 
  24. ^ a b c d "Eight hundred still in shelters in American Samoa". Radio New Zealand. February 13, 2018. Retrieved February 13, 2018. 
  25. ^ Sagapolutele, Fili (February 11, 2018). "Gov. issues emergency declaration, power and water coming back on". Samoa News. Retrieved February 13, 2018. 
  26. ^ "Tropical storm hits American Samoa with outages, some damage". Honolulu Star-Advertiser. February 10, 2018. Retrieved February 13, 2018. 
  27. ^ "President Donald J. Trump Approves American Samoa Emergency Declaration" (Press release). Government of the United States. February 11, 2018. Retrieved February 13, 2018. 
  28. ^ a b c "Tonga parliament building flattened by Cyclone Gita". BBC. February 13, 2018. Retrieved February 13, 2018. 
  29. ^ a b c d Mair, John (February 12, 2018). "Cyclone wreaks havoc in Tonga's capital, parliament flattened, homes wrecked". Reuters. Archived from the original on February 13, 2018. Retrieved February 13, 2018. 
  30. ^ a b "Severe injury in 'Eua devastation". Matangi Tonga. February 15, 2018. Retrieved February 15, 2018. 
  31. ^ a b c "Cyclone Gita: Tonga recovery could take months". Radio New Zealand. February 14, 2018. Retrieved February 14, 2018. 
  32. ^ a b c d "Cyclone Gita: Water, shelter and food main needs in Tonga". Radio New Zealand. February 13, 2018. Retrieved February 13, 2018. 
  33. ^ a b "Cyclone Gita: Tonga damage worst in decades". Radio New Zealand. February 13, 2018. Retrieved February 13, 2018. 
  34. ^ "Australian humanitarian assistance to Tonga". Government of Australia. ReliefWeb. February 13, 2018. Retrieved February 13, 2018. 
  35. ^ Movono, Lice (February 13, 2018). "TC Gita: At its closest now". The Fiji Times. Retrieved February 13, 2018. 
  36. ^ Severe TC Gita (Cat4) Passes Just South of Ono (PDF). Fiji Meteorological Services (Report). ReliefWeb. February 13, 2018. Retrieved February 13, 2018. 
  37. ^ Naleba, Mere (February 13, 2018). "TC Gita: Tidal surge reported on Ono-i-Lau". The Fiji Times. Retrieved February 13, 2018. 
  38. ^ Naleba, Mere (February 13, 2018). "TC Gita: Rooftop gone at Doi". The Fiji Times. Retrieved February 13, 2018. 
  39. ^ "Cyclone Gita moves away from Fiji but communication lost with islands in Southern Lau group". TVNZ. February 13, 2018. Retrieved February 13, 2018. 
  40. ^ Maika Bolatiki (February 15, 2018). "10 Houses Destroyed, 26 Partly Damaged On Islands". Fiji Sun. Retrieved February 15, 2018. 
  41. ^ "Cyclone Gita 'worst in living memory' on Fiji's Ono-i-Lau". Radio New Zealand. February 14, 2018. Retrieved February 14, 2018. 
  42. ^ "Nouvelle-Calédonie: Alerte cyclonique maximale à l'île des Pins" (in French). 20 minutes. Agence France-Presse. February 16, 2018. Retrieved February 16, 2018. 

External links[edit]