Overall Green alert Tropical Cyclone for ZAZU-20
in Niue, Tonga
16 Dec 2020 06 UTC
click on to select bulletin time
  • GDACS JTWC
Impact Single TC
Impact based on all weather systems in the area

Impact

    Tropical Cyclone ZAZU-20 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 102 km/h
    Maximum storm surge 0.2 m (15 Dec 01:00 UTC)
    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 102 km/h 0.2 m n.a. 0.5
    Overall 102 km/h 0.2 m n.a. 0.5

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

    TOP

    Wind

      102 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 13 Dec 2020 12:00 102 110 thousand No people Tonga, Niue
        Green 2 13 Dec 2020 18:00 102 110 thousand No people Tonga, Niue
        Green 3 14 Dec 2020 00:00 111 30 thousand No people Tonga, Niue
        Green 4 14 Dec 2020 06:00 111 110 thousand No people Tonga, Niue
        Green 5 14 Dec 2020 12:00 111 110 thousand No people Tonga, Niue
        Green 6 14 Dec 2020 18:00 102 110 thousand No people Tonga, Niue
        Green 7 15 Dec 2020 00:00 102 110 thousand No people Tonga, Niue
        Green 8 15 Dec 2020 06:00 83 110 thousand No people Tonga, Niue
        Green 9 15 Dec 2020 12:00 102 110 thousand No people Tonga, Niue
        Green 10 15 Dec 2020 18:00 102 110 thousand No people Niue, Tonga
        Green 11 16 Dec 2020 00:00 102 110 thousand No people Niue, Tonga
        Green 12 16 Dec 2020 06:00 102 110 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 13 Dec 2020 12:00 Tropical storm 65 no people 23000 people -17, -173.4
          GREEN
          		 2 13 Dec 2020 18:00 Tropical storm 65 no people 22000 people -17.7, -173.8
          GREEN
          		 3 14 Dec 2020 00:00 Tropical storm 74 no people 23000 people -17.9, -174.1
          GREEN
          		 4 14 Dec 2020 06:00 Tropical storm 83 no people 100000 people -18.3, -174.3
          GREEN
          		 5 14 Dec 2020 12:00 Tropical storm 83 no people 110000 people -18.8, -174.5
          GREEN
          		 6 14 Dec 2020 18:00 Tropical storm 83 no people 110000 people -18.9, -174.2
          GREEN
          		 7 15 Dec 2020 00:00 Tropical storm 93 no people 110000 people -18.8, -174 Tonga
          GREEN
          		 8 15 Dec 2020 06:00 Tropical storm 83 no people 110000 people -19, -173.6
          GREEN
          		 9 15 Dec 2020 12:00 Tropical storm 93 no people 34000 people -19.6, -172.4
          GREEN
          		 10 15 Dec 2020 18:00 Tropical storm 102 no people 22000 people -20.2, -171.2
          GREEN
          		 11 16 Dec 2020 00:00 Tropical storm 102 no people 1200 people -21, -170.2
          GREEN
          		 12 16 Dec 2020 06:00 Tropical storm 102 no people <1000 people -21.8, -168.8
          GREEN
          		 12 16 Dec 2020 18:00 Tropical storm 102 no people no people -25.5, -166.6
          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
          Niue
          Tonga

          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
          Haapai HPA 12 Civ. Unpaved Yes 3900
          Eua Kaufana EUA unknown 0
          Vavau International VAV 72 Civ. Unpaved Yes 5500
          Fua'amotu International TBU 38 Civ. Paved Yes 8700

          Ports

          Name LOCODE Country
          Alofi Niue
          Pangai TOPAN Tonga
          Eua Island Tonga
          Neiafu TONEI 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.

          ...

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          StormSurge

          0.2 m

          The maximum Storm surge height is  0.2m in Neiafu, Tonga. This height is estimated for 15 Dec 2020 01:00 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 (1 locations). Calculation based on advisory number 12 of 16 Dec 2020 06:00:00 UTC. (Simulation using 6 minute resolution)

          Alert Date (UTC) Name Country Storm surge height (m)
          15 Dec 2020 01:00 Neiafu Tonga  0.2