Overall Green alert Tropical Cyclone for EIGHT-17
in Niue, Tonga
22 Feb 2017 18 UTC
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  • GDACS JTWC
Impact Single TC
  • GFS
  • HWRF
  • ECMWF
Impact based on all weather systems in the area

Impact

    Tropical Cyclone EIGHT-17 can have a low humanitarian impact based on the maximum sustained wind speed,exposed population and vulnerability.

    Meteorological source GDACS
    Exposed countries Niue, Tonga
    Exposed population No people in Category 1 or higher
    Maximum wind speed 74 km/h
    Maximum storm surge n.a.
    Vulnerability High (Niue)

    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 65 km/h n.a. n.a. 0.5
    Overall 74 km/h 0.0 m n.a. 0.5

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

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    Wind

      65 km/h Current Max.

      Up to 110000 people in Tropical Storm 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
        Green 1 22 Feb 2017 00:00 74 110 thousand No people Tonga, Niue
        Green 2 22 Feb 2017 12:00 65 110 thousand No people Niue, Tonga
        Green 3 22 Feb 2017 18:00 65 110 thousand No people Niue, 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 22 Feb 2017 00:00 Tropical storm 74 no people no people -21.2, -172.8
          GREEN
          		 2 22 Feb 2017 12:00 Tropical storm 65 no people no people -24.7, -166.9
          GREEN
          		 3 22 Feb 2017 18:00 Tropical storm 65 no people no people -26.6, -163.7
          GREEN
          		 3 23 Feb 2017 06:00 Tropical storm 65 no people no people -31.1, -157.1
          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 Population in Tropical Storm or higher strength
          Niue <1000 people
          Tonga 51000 people

          Provinces

          Region Province Country
          Niue Niue
          Tonga Tonga

          Populated places

          Name Region Province Country City class Population
          Alofi Niue Capital <1000 people
          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)
          Niue Hanan IUE 64 Civ. Paved Yes 7600
          Eua Kaufana EUA unknown 0
          Fua'amotu International TBU 38 Civ. Paved Yes 8700
          Haapai HPA 12 Civ. Unpaved Yes 3900
          Vavau International VAV 72 Civ. Unpaved Yes 5500

          Ports

          Name LOCODE Country
          Alofi Niue
          Eua Island Tonga
          Nuku'alofa TOTBU Tonga
          Pangai TOPAN Tonga
          Ata Island Tonga
          Neiafu TONEI 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.

          ...

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          StormSurge

          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.