Overall Red alert Tropical Cyclone for GITA-18
in Tonga
GDACS
Impact Single TC
Impact all weather systems in the area

Impact

Tropical Cyclone GITA-18 can have a high humanitarian impact based on the maximum sustained wind speed,exposed population and vulnerability.

Meteorological source GDACS
Exposed countries Tonga
Exposed population 80 thousand in Category 1 or higher
Maximum wind speed 231 km/h
Maximum storm surge 1.6 m (20 Feb 12:00 UTC)
Vulnerability Medium (Tonga)

GDACS Score

GDACS alert score for Tropical Cyclones is 0.5 (GREEN Alert), 1.5 (ORANGE Alert), 2.5 (RED Alert)
For more info on GDACS alert score click here.
  Wind Storm surge Rainfall GDACS score
GDACS Current 93 km/h n.a. n.a. 0.5
GDACS Overall 231 km/h 1.6 m n.a. 2.5

Maximum winds, storm surge, rainfall (Current: over the next 72 h, Overall: entire TC track)

Wind

93 km/h Current Max.

Up to 2.6 million people in Tropical Storm strength or higher (see SSHS)

Impact Timeline

Alert Date (UTC) Max Winds (km/h) Population in
Tropical Storm or higher
Population in
Cat 1. or higher
Countries
Orange 1 09 Feb 2018 00:00 120 390 thousand 80 thousand Tonga
Orange 2 09 Feb 2018 06:00 148 400 thousand 80 thousand Tonga
Orange 3 09 Feb 2018 12:00 148 930 thousand 80 thousand Tonga
Orange 4 09 Feb 2018 18:00 139 830 thousand 80 thousand Tonga
Orange 5 10 Feb 2018 00:00 139 820 thousand 80 thousand Tonga
Orange 6 10 Feb 2018 06:00 139 600 thousand 80 thousand Tonga
Orange 7 10 Feb 2018 12:00 130 670 thousand 80 thousand Tonga
Orange 8 10 Feb 2018 18:00 176 770 thousand 80 thousand Tonga
Green 9 11 Feb 2018 00:00 204 390 thousand Few people Niue, Tonga, American Samoa, Wallis and Futuna, Fiji
Red 10 11 Feb 2018 06:00 185 1.1 million 80 thousand Tonga
Red 11 11 Feb 2018 12:00 185 980 thousand 80 thousand Tonga
Red 12 11 Feb 2018 18:00 185 1.1 million 80 thousand Tonga
Red 13 12 Feb 2018 00:00 213 790 thousand 80 thousand Tonga
Red 14 12 Feb 2018 06:00 231 540 thousand 80 thousand Tonga
Red 15 12 Feb 2018 12:00 231 360 thousand 80 thousand Tonga
Green 16 12 Feb 2018 18:00 231 970 thousand 80 thousand Tonga
Green 17 13 Feb 2018 00:00 222 800 thousand 80 thousand Tonga
Green 18 13 Feb 2018 06:00 213 740 thousand 80 thousand Tonga
Green 19 13 Feb 2018 12:00 204 390 thousand 80 thousand Tonga
Green 20 13 Feb 2018 18:00 204 540 thousand 80 thousand Tonga
Green 21 14 Feb 2018 00:00 213 580 thousand 80 thousand Tonga
Green 22 14 Feb 2018 06:00 213 560 thousand 80 thousand Tonga
Green 23 14 Feb 2018 12:00 213 550 thousand 80 thousand Tonga
Green 24 14 Feb 2018 18:00 194 1.2 million 80 thousand Tonga
Green 25 15 Feb 2018 00:00 194 4 million 80 thousand Tonga
Green 26 15 Feb 2018 06:00 194 4.6 million 80 thousand Tonga
Green 27 15 Feb 2018 12:00 185 4.6 million 80 thousand Tonga
Green 28 15 Feb 2018 18:00 185 4.6 million 80 thousand Tonga
Green 29 16 Feb 2018 00:00 176 4.2 million 80 thousand Tonga
Green 30 16 Feb 2018 06:00 167 4.5 million 80 thousand Tonga
Green 31 16 Feb 2018 12:00 148 4.6 million 80 thousand Tonga
Green 32 16 Feb 2018 18:00 139 4.7 million 80 thousand Tonga
Green 33 17 Feb 2018 00:00 130 2.2 million 80 thousand Tonga
Green 34 17 Feb 2018 06:00 120 4.2 million 80 thousand Tonga
Green 35 17 Feb 2018 12:00 111 2.9 million 80 thousand Tonga
Green 36 17 Feb 2018 18:00 111 2.4 million 80 thousand Tonga
Green 37 18 Feb 2018 00:00 102 2.9 million 80 thousand Tonga
Green 38 18 Feb 2018 06:00 93 4.5 million 80 thousand Tonga
Green 39 18 Feb 2018 12:00 93 4.7 million 80 thousand Tonga
Green 40 18 Feb 2018 18:00 93 4.3 million 80 thousand Tonga
Green 41 19 Feb 2018 00:00 93 2.9 million 80 thousand Tonga
Green 42 19 Feb 2018 06:00 93 2.6 million 80 thousand Tonga

Bulletin Timeline

Alert Date (UTC) Category Max winds
(km/h)
Population in
Tropical Storm
Population in
Cat.1 or higher
Location (lat, lon) Countries
GREEN
1 09 Feb 2018 00:00 Tropical storm 74 260000 people no people -13.8, -175.5 American Samoa
GREEN
2 09 Feb 2018 06:00 Tropical storm 74 260000 people no people -14.3, -174.5 Niue
GREEN
3 09 Feb 2018 12:00 Tropical storm 83 250000 people no people -14.5, -173 Niue
GREEN
4 09 Feb 2018 18:00 Tropical storm 83 250000 people no people -15.3, -171.4 Niue
GREEN
5 10 Feb 2018 00:00 Tropical storm 93 200000 people no people -16.1, -170 Niue
GREEN
6 10 Feb 2018 06:00 Tropical storm 93 1100 people no people -17, -169 Niue
GREEN
7 10 Feb 2018 12:00 Tropical storm 102 1100 people no people -18.2, -168.5 Niue
GREEN
8 10 Feb 2018 18:00 Category 1 139 1100 people no people -18.9, -168.6 Niue
GREEN
9 11 Feb 2018 00:00 Category 2 157 1100 people no people -20.5, -168.3 Niue
GREEN
10 11 Feb 2018 06:00 Category 2 167 6200 people no people -20.9, -168.9 Niue
GREEN
11 11 Feb 2018 12:00 Category 2 167 100000 people no people -21.4, -170.2 Niue
GREEN
12 11 Feb 2018 18:00 Category 2 176 100000 people no people -21.7, -171.5 Tonga
RED
13 12 Feb 2018 00:00 Category 3 204 100000 people 82000 people -21.8, -172.6 Tonga
RED
14 12 Feb 2018 06:00 Category 4 231 90000 people 82000 people -21.8, -174.3 Tonga
RED
15 12 Feb 2018 12:00 Category 4 231 84000 people 83000 people -21.5, -175.5 Tonga
GREEN
16 12 Feb 2018 18:00 Category 4 231 100000 people <1000 people -21.3, -177.1 Fiji
GREEN
17 13 Feb 2018 00:00 Category 4 222 80000 people <1000 people -21.2, -178.4 Fiji
GREEN
18 13 Feb 2018 06:00 Category 4 213 340000 people <1000 people -21, -179.5 Fiji
GREEN
19 13 Feb 2018 12:00 Category 3 204 20000 people no people -21.1, 179.5 Fiji
GREEN
20 13 Feb 2018 18:00 Category 3 204 12000 people no people -21, 178.6 Fiji
GREEN
21 14 Feb 2018 00:00 Category 4 213 13000 people no people -21.1, 177.7 Fiji
GREEN
22 14 Feb 2018 06:00 Category 4 213 10000 people no people -21.3, 177 Fiji
GREEN
23 14 Feb 2018 12:00 Category 4 213 <1000 people no people -21.5, 176
GREEN
24 14 Feb 2018 18:00 Category 3 194 <1000 people no people -21.5, 175.3
GREEN
25 15 Feb 2018 00:00 Category 3 194 <1000 people no people -21.5, 174.2 Vanuatu
GREEN
26 15 Feb 2018 06:00 Category 3 194 <1000 people <1000 people -21.8, 173.4
GREEN
27 15 Feb 2018 12:00 Category 3 185 8800 people <1000 people -22.3, 172.2 New Caledonia
GREEN
28 15 Feb 2018 18:00 Category 3 185 170000 people <1000 people -22.6, 171.2 New Caledonia
GREEN
29 16 Feb 2018 00:00 Category 2 176 200000 people no people -22.8, 170 Vanuatu
GREEN
30 16 Feb 2018 06:00 Category 2 167 210000 people no people -23.2, 169 Vanuatu
GREEN
31 16 Feb 2018 12:00 Category 1 148 210000 people no people -23.5, 168 New Caledonia
GREEN
32 16 Feb 2018 18:00 Category 1 139 200000 people no people -23.8, 167.3 New Caledonia
GREEN
33 17 Feb 2018 00:00 Category 1 130 180000 people no people -24.5, 166.4 New Caledonia
GREEN
34 17 Feb 2018 06:00 Category 1 120 90000 people no people -24.9, 165.6 New Caledonia
GREEN
35 17 Feb 2018 12:00 Tropical storm 111 no people no people -25.5, 164.7
GREEN
36 17 Feb 2018 18:00 Tropical storm 111 no people no people -26, 164.1
GREEN
37 18 Feb 2018 00:00 Tropical storm 102 no people no people -26.7, 163.3
GREEN
38 18 Feb 2018 06:00 Tropical storm 93 no people no people -27.4, 162.6
GREEN
39 18 Feb 2018 12:00 Tropical storm 93 no people no people -28.2, 162.4
GREEN
40 18 Feb 2018 18:00 Tropical storm 93 no people no people -29.2, 161.9
GREEN
41 19 Feb 2018 00:00 Tropical storm 93 <1000 people no people -30.9, 161.9
GREEN
42 19 Feb 2018 06:00 Tropical storm 93 no people no people -32.6, 162.6
GREEN
42 19 Feb 2018 18:00 Tropical storm 93 1.5 million people no people -36.2, 166 New Zealand
GREEN
42 20 Feb 2018 06:00 Tropical storm 93 2 million people no people -40.5, 170.8 New Zealand
GREEN
42 20 Feb 2018 18:00 Tropical storm 83 no people no people -43.9, 174.2 New Zealand
Actual track of the current bulletin
The alert for forecast greater than 3 days is limited to Orange level.
Download:



Exposed population - AoIs

Exposed population in the potential affected countries, provinces and populated places

Countries

Country
New Zealand
New Caledonia
Vanuatu
Fiji
Tonga
Wallis & Futuna
Niue
Samoa
American Samoa

Provinces

Region Province Country Population
New Caledonia New Caledonia 170000 people
Waikato New Zealand 38000 people
Taranaki New Zealand -
Westland New Zealand 9500 people
Nelson-Marlborough New Zealand -
Wanganui-Manawatu New Zealand -
Bay of Plenty New Zealand -
Canterbury New Zealand -
Southland New Zealand 34000 people
Otago New Zealand -
Hawke's Bay New Zealand -
Wellington New Zealand 150000 people
Vanuatu Vanuatu 160000 people
Fiji Fiji 750000 people
Tonga Tonga 98000 people
Wallis & Futuna Wallis and Futuna 14000 people
Niue Niue 2000 people
Samoa Samoa 150000 people
American Samoa American Samoa 53000 people

Populated places

Name Region Province Country City class Population
Nouméa New Caledonia Capital 83000 people
Comm. du Mont-Dore New Caledonia City -
Hawera Taranaki New Zealand City 10000 people
Greymouth West Coast New Zealand City 9300 people
Nelson Nelson New Zealand Major city 45000 people
Wanganui Manawatu Wanganui New Zealand City 39000 people
Taupo Waikato New Zealand City 22000 people
Blenheim Marlborough New Zealand City 28000 people
Taihape Manawatu Wanganui New Zealand City 1700 people
Porirua Wellington New Zealand City 50000 people
Palmerston North Manawatu Wanganui New Zealand City 75000 people
Wellington Wellington New Zealand Capital 170000 people
Lower Hutt Wellington New Zealand City 99000 people
Upper Hutt Wellington New Zealand City 35000 people
Masterton Wellington New Zealand City 20000 people
Waipawa Hawke's Bay New Zealand City -
Waipukurau Hawke's Bay New Zealand City 3900 people
Christchurch Canterbury New Zealand Major city 350000 people
Napier Hawke's Bay New Zealand City 56000 people
Hastings Hawke's Bay New Zealand City 61000 people
Havelock North Hawke's Bay New Zealand City -
Timaru Canterbury New Zealand City 27000 people
Oamaru Otago New Zealand City 12000 people
Gore Southland New Zealand City 10000 people
Dunedin Otago New Zealand Major city 110000 people
Nasau Fiji City -
Soso Fiji City -
Nuku'alofa Tonga Capital 24000 people
Mata-Utu Wallis and Futuna Capital 970000 people
Alofi Niue Capital <1000 people
Apia Samoa Capital 39000 people
Taputimu American Samoa City <1000 people
Futiga American Samoa City <1000 people
Mesepa American Samoa City <1000 people
Fagasa American Samoa City <1000 people
Pago Pago American Samoa Capital 4100 people
Utulei American Samoa City <1000 people
Leloaloa American Samoa City <1000 people
Afono American Samoa City <1000 people
Alofau American Samoa City <1000 people
Amouli American Samoa City <1000 people
Aoa American Samoa City <1000 people
Alao American Samoa City <1000 people
Tula American Samoa City <1000 people

Critical infrastructure

Airports, ports, nuclear plants and hydrodams at risk, if affected, are listed below.

Airports

Name IATA Code Elevation (m) Usage Runway type IFR Runway Length (ft)
Lord Howe Island LDH unknown Civ. Paved Yes 2900
Ile Ouen IOU unknown 0
Noumea / Magenta GEA 3 Civ. Paved Yes 4100
Ile Des Pins Moue ILP 96 Civ. Paved No 3600
La Tontouta NOU 16 Civ. Paved Yes 10600
Raglan RAG unknown 0
New Plymouth NPL 30 Civ. Paved Yes 4200
Karamea 9 Civ. Unpaved No 3000
Westport WSZ 4 Civ. Paved Yes 4100
Takaka KTF unknown 0
Stratford 288 Civ. Unpaved No 3100
Hawera 114 Priv. Unpaved No 3100
Motueka MZP unknown 0
Greymouth GMN 4 Priv. Paved Yes 2700
Taumarunui 198 Civ. Unpaved No 4100
Hokitika HKK 45 Civ. Paved No 4300
Mare la Roche MEE 43 Civ. Paved No 3200
Nelson NSN 5 Civ. Paved Yes 4400
Franz Josef WHO unknown 0
Fox Glacier FGL unknown 0
Wanganui WAG 8 Civ. Paved Yes 4500
Wanaham LIF 28 Civ. Paved No 3600
Taupo TUO 407 Civ. Paved Yes 4500
Waiouru 823 Mil. Paved No 3900
Mount Cook MON 656 Civ. Paved No 5100
Picton Koromiko PCN unknown 0
Woodbourne BHE 33 Civ. Paved Yes 4600
Milford Sound MFN unknown 0
Glentanner GTN 556 Civ. Paved No 3100
Ohakea OHA 50 Mil. Paved Yes 8000
Foxpine 11 0
Paraparaumu PPQ 7 Civ. Paved Yes 4400
Palmerston North PMR 45 Civ. Paved Yes 6200
Pukaki 480 Civ. Paved No 3500
Wellington International WLG 12 Civ. Paved Yes 6300
Wanaka WKA 348 Civ. Paved No 3900
Omarama 421 Civ. Unpaved No 4500
Dannevirke 194 Civ. Unpaved No 3900
Queenstown ZQN 358 Civ. Paved Yes 6200
Masterton MRO 111 Civ. Paved No 4100
Ashburton ASG 91 Civ. Unpaved No 4500
Christchurch International CHC 37 Civ. Paved Yes 10700
Napier NPE 2 Civ. Paved Yes 4200
Hastings 22 Civ. Paved No 3500
Waipukurau 131 Civ. Unpaved No 3400
Wigram ZWG 23 Civ. Paved No 5100
Timaru TIU 27 Civ. Paved No 4100
Alexandra ALR 229 Civ. Paved No 3900
Oamaru OAM 30 Civ. Paved No 4200
Gore 60 Civ. Unpaved No 4200
Dunedin DUD 1 Civ. Paved Yes 6200
Kandavu KDV unknown 0
Vatulele VTF unknown 0
Ono-I-Lau ONU unknown 0
Ngau NGI unknown 0
Moala MFJ unknown 0
Fua'amotu International TBU 38 Civ. Paved Yes 8700
Eua Kaufana EUA unknown 0
Haapai HPA 12 Civ. Unpaved Yes 3900
Wallis Island WLS 24 Civ. Paved Yes 6500
Niue Hanan IUE 64 Civ. Paved Yes 7600
Maota MXS unknown 0
Lalomalava LAV unknown 0
Faleolo APW 18 Civ. Paved Yes 8800
Pago Pago International PPG 9 Civ. Paved Yes 9000
Ofu OFU 3 0
Tau TAV 56 0
Fitiuta FTI 34 0

Ports

Name LOCODE Country
Lord Howe Is AULDH Coral Sea Islands
Kuto New Caledonia
Noumea NCNOU New Caledonia
Ducos NCDUS New Caledonia
Cape Egmont New Zealand
New Plymouth NZNPL New Zealand
Port Taranaki / New Plymouth NZNPL New Zealand
Taharoa New Zealand
Opunake New Zealand
Waitara New Zealand
Collingwood New Zealand
Thialis NCTHI New Caledonia
Karamea New Zealand
Kouaoua NCKOU New Caledonia
Cape Foulwind New Zealand
Baie de Poro NCPOR New Caledonia
Westport NZWSZ New Zealand
Motueka NZMZP New Zealand
Runanga New Zealand
Greymouth NZGMN New Zealand
Tadine New Caledonia
Patea New Zealand
Hokitika New Zealand
Waverley Harbour NZWAV New Zealand
Ross New Zealand
Nelson NZNSN New Zealand
Okarito New Zealand
D'urville Island New Zealand
Jackson New Zealand
We New Caledonia
Wanganui NZWAG New Zealand
Picton NZPCN New Zealand
Milford Sound New Zealand
Matthew Island New Caledonia
Blenheim NZBHE New Zealand
Porirua New Zealand
Lower Hutt New Zealand
Cape Campbell New Zealand
Petone New Zealand
Wellington NZWLG New Zealand
Kaikoura NZKBZ New Zealand
Hunter Island New Caledonia
Rangiora New Zealand
Napier NZNPE New Zealand
Christchurch NZCHC New Zealand
Cape Palliser New Zealand
Lyttelton NZLYT New Zealand
Timaru NZTIU New Zealand
Cape Kidnappers New Zealand
Riverdale New Zealand
Cape Turnagain New Zealand
Akaroa NZAKA New Zealand
Aneityum Island Vanuatu
Oamaru NZOAM New Zealand
Port Chalmers (Dunedin Harbour) NZPOE New Zealand
Otago NZORR New Zealand
Dunedin NZDUD New Zealand
Kaitangata NZKTG New Zealand
Kandavu Island Fiji
Ata Island Tonga
Nuku'alofa TOTBU Tonga
Eua Island Tonga
Pangai TOPAN Tonga
Mata Utu Wallis and Futuna
Alofi Niue
Apia WSAPW Samoa
Apia Samoa
Pago Pago ASPPG American Samoa
Manua Island American Samoa

Dams

Reservoir Dam Name River Year
Mangamahoe Mangamahoe 1931
Ratapiko Mako 1926
Cobb Cobb 1954
Patea Patea 1984
Maraetai Waikato 1953
Whakamaru Waikato 1956
Otamangakau Otamanakau Stream 1971
Kuratau Kuratau 1962
Rotoaira Poutu Poutu 1972
Rangipo Tongariro 1980
Waihopai Waihopai 1927
Hinemaiaia B Hinemaiaia 1966
Moawhango Moawhango 1975
Hinemaiaia A Hinemaiaia 1952
Taylor Taylor -99
Tekapo Tekapo Lake Control Tekapo 1951
Pukaki Pukaki Canal Inlet Dam Pukaki 1976
Upper Karori Kaiwharawhara 1908
Lower Karori Kaiwharawhara 1872
Ruantaniwha Ohau 1981
Hawea Hawea Lake Control Hawea 1959
Te Marua 2 Hutt 1985
Te Marua 1 Hutt 1986
Morton Wainuiomata 1911
Benmore Waitiki 1965
Aviemore Waitaki 1968
Falls Manuherikia 1935
Waitaki Waitaki 1934
Clyde Clutha 1987
Fraser Fraser 1937
West Eweburn Eweburn 1900
Lower Manorburn Manorburn 1933
Conroys Conroys Creek 1936
Butchers Butchers Creek 1937
Poolburn Poolburn 1931
Upper Manorburn Manorburn 1917
Roxburgh Clutha 1956
Onslow Teviot 1982
Mahinerangi Waipori 1931

Rainfall

Rainfall accumulation of the past 24h, as detected by the Global Precipitation Measurement mission of NASA. For more information, see https://www.nasa.gov/mission_pages/GPM/main/index.html.

...

StormSurge

1.6 m

The maximum Storm surge height is  1.6m in Tahunanui, New Zealand. This height is estimated for 20 Feb 2018 12:00 UTC .

The JRC has developed an experimental global storm surge model. The calculations are published about 20 minutes after a new advisory is detected by GDACS. The calculations identify the populated places affected by storm surge up to three days in advance, using the forecasted track. When forecasts change, the associated storm surge changes too and alert levels may go up or down. All links, data, statistics and maps refer to the latest available calculation. If the calculation for the last advisory is not completed, the latest available calculation is shown.

Locations affected by Storm surge (338 locations). Calculation based on advisory number 44 of 19 Feb 2018 18:00:00 UTC. (Simulation using 0.5 minute resolution)

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