Overall Red alert Tropical Cyclone for GITA-18
in Tonga
10 Feb 2018 12 UTC
click on to select bulletin time
  • GDACS JTWC
Impact Single TC
Impact based on 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 0.4 m (12 Feb 08:00 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
    Current 130 km/h 0.4 m n.a. 1.5
    Overall 231 km/h 0.4 m n.a. 1.5

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

    TOP

    Wind

      130 km/h Current Max.

      Up to 84000 people in Category 1 strength or higher (see SSHS)

      Impact Timeline

        Alert N° 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

        Bulletin Timeline

          Alert N° Date (UTC) Category
          (SSHS)           		Max winds
          (km/h)           		Population in
          Cat.1 or higher           		Population in
          Tropical Storm
          or higher           		Location (lat, lon) Countries
          GREEN
          		 1 09 Feb 2018 00:00 Tropical storm 74 no people 270000 people -13.8, -175.5 American Samoa
          GREEN
          		 2 09 Feb 2018 06:00 Tropical storm 74 no people 270000 people -14.3, -174.5 Niue
          GREEN
          		 3 09 Feb 2018 12:00 Tropical storm 83 no people 250000 people -14.5, -173 Niue
          GREEN
          		 4 09 Feb 2018 18:00 Tropical storm 83 no people 250000 people -15.3, -171.4 Niue
          GREEN
          		 5 10 Feb 2018 00:00 Tropical storm 93 no people 210000 people -16.1, -170 Niue
          GREEN
          		 6 10 Feb 2018 06:00 Tropical storm 93 no people 1200 people -17, -169 Niue
          GREEN
          		 7 10 Feb 2018 12:00 Tropical storm 102 no people 1200 people -18.2, -168.5 Niue
          GREEN
          		 7 11 Feb 2018 00:00 Tropical storm 111 no people 1200 people -20.2, -169 Niue
          GREEN
          		 7 11 Feb 2018 12:00 Category 1 120 no people 110000 people -21.2, -170.8 Niue
          ORANGE
          		 7 12 Feb 2018 00:00 Category 1 130 83000 people 110000 people -21.5, -173.4 Tonga
          GREEN
          		 7 12 Feb 2018 12:00 Category 1 139 <1000 people 410000 people -21.4, -176 Tonga
          GREEN
          		 7 13 Feb 2018 12:00 Category 1 148 no people 300000 people -21.5, 179.5 Fiji
          GREEN
          		 7 14 Feb 2018 12:00 Category 1 148 no people <1000 people -23, 175.8
          GREEN
          		 7 15 Feb 2018 12:00 Category 1 130 no people no people -24.9, 172.3
          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
          Tonga

          Provinces

          Region Province Country
          Tonga Tonga

          Populated places

          Name Region Province Country City class Population
          Nuku'alofa Tonga Capital 24000 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)
          Eua Kaufana EUA unknown 0
          Fua'amotu International TBU 38 Civ. Paved Yes 8700
          Ono-I-Lau ONU unknown 0

          Ports

          Name LOCODE Country
          Eua Island Tonga
          Nuku'alofa TOTBU Tonga
          TOP

          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.

          ...

          TOP

          StormSurge

          0.4 m

          The maximum Storm surge height is  0.4m in Nukunuku, Tonga. This height is estimated for 12 Feb 2018 08:00 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 (14 locations). Calculation based on advisory number 7 of 10 Feb 2018 12:00:00 UTC. (Simulation using 0.5 minute resolution)

          Alert Date (UTC) Name Country Storm surge height (m)
          12 Feb 2018 08:00 Nukunuku Tonga  0.4
          12 Feb 2018 08:00 Houma Tonga  0.4
          12 Feb 2018 08:00 Pea Tonga  0.4
          12 Feb 2018 08:00 Nuku'alofa Tonga  0.4
          12 Feb 2018 08:00 Fuaamotu Tonga  0.4
          12 Feb 2018 08:00 Mua Tonga  0.4
          12 Feb 2018 08:00 Fatumu Tonga  0.4
          12 Feb 2018 08:00 Kolonga Tonga  0.4
          12 Feb 2018 08:00 Niutoua Tonga  0.4
          12 Feb 2018 08:00 Ohonua Tonga  0.4
          12 Feb 2018 09:00 Foui Tonga  0.4
          09 Feb 2018 01:00 Mua Wallis and Futuna  0.1
          09 Feb 2018 01:00 Mata-Utu Wallis and Futuna  0.1
          10 Feb 2018 19:00 Liku Niue  0.1