Overall Green alert Tropical Cyclone for ZAZU-20
in Niue, Tonga
14 Dec 2020 18 UTC
click on to select bulletin time
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 HWRF
Exposed countries Tonga, Niue
Exposed population No people in Category 1 or higher
Maximum wind speed 90 km/h
Maximum storm surge 0.9 m (17 Dec 18:00 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
HWRF Current 90 km/h 0.9 m 25 mm 0.5
HWRF Overall 112 km/h 1.1 m 640 mm 0.5

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

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Wind

112 km/h

Up to 20 thousand can be affected by wind speeds of Tropical Storm strength or above



Wind exposed population - AoIs

Estimations based on the bulletin of 14 Dec 2020 18:00 UTC
CategoryCountryPopulation 
Tropical StormTonga, Niue21,765
+
Tonga20,578 
Niue1,187 

See TC classification SSHS


Wind Impact Timeline

people affected <=10000
10000< people affected <=100000
people affected >100000


Alert N° Date (UTC) Max Winds (km/h) Pop in Cat. 1 or higher TS Cat. 1 Cat. 2 Cat. 3 Cat. 4 Cat. 5 Countries
GREEN 1 13 Dec 2020 12:00 97 - - - - - - -
GREEN 2 13 Dec 2020 18:00 86 - - - - - - -
GREEN 3 14 Dec 2020 00:00 83 - - - - - - -
GREEN 4 14 Dec 2020 06:00 90 -
- - - - - Tonga
GREEN 5 14 Dec 2020 12:00 101 -
- - - - - Tonga
GREEN 6 14 Dec 2020 18:00 133 -
- - - - - Tonga, Niue
Download:





Impact estimation for the next 72h
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Rainfall





Rain exposed population - AoIs

Estimations based on the bulletin of 14 Dec 2020 18:00 UTC
LevelCountryPopulation 
50-100 mmNiue1,190 

Rain Impact Timeline

people affected <=10000
10000< people affected <=100000
people affected >100000


Alert N° Date (UTC) Max Rainfall (mm) Pop >100mm or higher 50-100 100-250 250-500 500-750 750-1000 >1000 Countries
Blue 1 13 Dec 2020 12:00 27 - - - - - - -
Blue 2 13 Dec 2020 18:00 24 - - - - - - -
Blue 3 14 Dec 2020 00:00 23 - - - - - - -
Blue 4 14 Dec 2020 06:00 25 1 thousand - - - - - - Tonga
Blue 5 14 Dec 2020 12:00 28 20 thousand - - - - - - Tonga
Blue 6 14 Dec 2020 18:00 517 -
- - - - - Niue




Impact estimation for the next 72h
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StormSurge

0.9 m

The maximum Storm surge height is  0.9m in Matacawalevu, Fiji. This height is estimated for 17 Dec 2020 18:00 UTC .

The JRC has developed an experimental global storm surge model, which is run after each advisory issued by the regional tropical cyclone centres. 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.

Storm Surge Exposed population - AoIs


Storm Surge Exposed locations

Calculation based on the bulletin of 14 Dec 2020 18:00 UTC
    
Alert Date (UTC) Name Country Storm surge height (m)
17 Dec 2020 18:00 Matacawalevu Fiji  0.9
17 Dec 2020 18:00 Sisili Fiji  0.9
17 Dec 2020 18:00 Nacula Fiji  0.9
17 Dec 2020 18:00 Navotua Fiji  0.9
17 Dec 2020 18:00 Tamusua Fiji  0.9
17 Dec 2020 18:00 Teci Fiji  0.9
17 Dec 2020 18:00 Mbukama Fiji  0.9
17 Dec 2020 18:00 Yasawairara Fiji  0.9
17 Dec 2020 18:00 Soso Fiji  0.8
17 Dec 2020 18:00 Somosomo Fiji  0.8
17 Dec 2020 18:00 Matayalevu Fiji  0.8
17 Dec 2020 18:00 Nalauwaki Fiji  0.7
15 Dec 2020 20:00 Lautoka Fiji  0.6
15 Dec 2020 20:00 Nailanga Fiji  0.6
15 Dec 2020 20:00 Sorokoba Fiji  0.6
17 Dec 2020 18:00 Ba Fiji  0.6
17 Dec 2020 18:00 Tavua Fiji  0.6
15 Dec 2020 20:00 Namaka Fiji  0.6
15 Dec 2020 20:00 Natunuka Fiji  0.6
17 Dec 2020 18:00 Tavua Fiji  0.5
17 Dec 2020 18:00 Solevu Fiji  0.5
17 Dec 2020 18:00 Rabulu Fiji  0.5
17 Dec 2020 18:00 Togowere Fiji  0.5
15 Dec 2020 12:15 Koroinasolo Fiji  0.5
15 Dec 2020 12:15 Savu Sau Fiji  0.5
15 Dec 2020 12:15 Navinggiri Fiji  0.5
15 Dec 2020 12:15 Yangganga Fiji  0.5
15 Dec 2020 12:15 Nawailevu Fiji  0.5
15 Dec 2020 19:00 Natua Fiji  0.4
15 Dec 2020 19:00 Mbangata Fiji  0.4
15 Dec 2020 19:00 Savusavu Fiji  0.4
15 Dec 2020 19:00 Naindi Fiji  0.4
15 Dec 2020 19:00 Korosi Fiji  0.4
17 Dec 2020 18:00 Rakiraki Fiji  0.4
17 Dec 2020 18:00 Vaileka Fiji  0.4
17 Dec 2020 18:00 Nanukuloa Fiji  0.4
17 Dec 2020 18:00 Nanduri Fiji  0.4
17 Dec 2020 18:00 Vatutandova Fiji  0.4
17 Dec 2020 18:00 Nasea Fiji  0.4
15 Dec 2020 06:15 Otumoetai New Zealand  0.3
15 Dec 2020 06:15 Mount Maunganui New Zealand  0.3
15 Dec 2020 06:15 Matapihi New Zealand  0.3
15 Dec 2020 06:15 Kairua New Zealand  0.3
15 Dec 2020 06:15 Papamoa New Zealand  0.3
15 Dec 2020 10:00 Korotasere Fiji  0.3
15 Dec 2020 10:00 Naweni Fiji  0.3
15 Dec 2020 10:00 Viani Fiji  0.3
15 Dec 2020 10:00 Ndrekeniwai Fiji  0.3
15 Dec 2020 10:00 Mbangasau Fiji  0.3
17 Dec 2020 03:45 Korovou Fiji  0.3
17 Dec 2020 03:45 Lodoni Fiji  0.3
17 Dec 2020 03:45 Lawaki Fiji  0.3
17 Dec 2020 03:45 Naingani Fiji  0.3
17 Dec 2020 03:45 Navuti Fiji  0.3
17 Dec 2020 03:45 Nasaga Fiji  0.3
17 Dec 2020 03:45 Rukuruku Fiji  0.3
17 Dec 2020 03:45 Lovoni Fiji  0.3
17 Dec 2020 18:00 Nasarowangga Fiji  0.3
17 Dec 2020 04:15 Nasau Fiji  0.3
17 Dec 2020 04:15 Nayavutoka Fiji  0.3
17 Dec 2020 18:00 Navindamu Fiji  0.3
17 Dec 2020 18:00 Nagumu Fiji  0.3
15 Dec 2020 09:45 Nakarambo Fiji  0.3
16 Dec 2020 12:45 Ucunivanua Fiji  0.3
16 Dec 2020 12:00 Lao Fiji  0.3
16 Dec 2020 12:00 Nailou Fiji  0.3
16 Dec 2020 12:00 Nawi Fiji  0.3
16 Dec 2020 12:00 Vunikura Fiji  0.3
16 Dec 2020 12:00 Napuka Fiji  0.3
17 Dec 2020 18:00 Ndenimanu Fiji  0.3
15 Dec 2020 10:15 Nabouwalu Fiji  0.3
15 Dec 2020 10:15 Thavanga Fiji  0.3
15 Dec 2020 10:15 Ndaria Fiji  0.3
15 Dec 2020 10:15 Rave-rave Fiji  0.3
17 Dec 2020 18:00 Ndalomo Fiji  0.3
17 Dec 2020 03:30 Nauouo Fiji  0.3
17 Dec 2020 03:30 Levuka Fiji  0.3
15 Dec 2020 19:00 Ndawara Fiji  0.3
15 Dec 2020 19:00 Waisa Fiji  0.3
17 Dec 2020 18:00 Momi Fiji  0.3
17 Dec 2020 13:00 Kasavu Fiji  0.3
17 Dec 2020 13:00 Naimasimasi Fiji  0.3
15 Dec 2020 10:30 Opoutere New Zealand  0.3
15 Dec 2020 10:30 Whangamata New Zealand  0.3
15 Dec 2020 06:00 Maketu New Zealand  0.2
15 Dec 2020 06:00 Maniatutu New Zealand  0.2
15 Dec 2020 06:00 Pukehina New Zealand  0.2
15 Dec 2020 06:00 Ohinepanea New Zealand  0.2
15 Dec 2020 06:00 Otamarakau New Zealand  0.2
15 Dec 2020 06:00 Pikowai New Zealand  0.2
17 Dec 2020 13:15 Nausori Fiji  0.2
17 Dec 2020 13:15 Lokia Fiji  0.2
17 Dec 2020 13:15 Cautata Fiji  0.2
17 Dec 2020 13:15 Nasilai Fiji  0.2
17 Dec 2020 13:15 Dromuna Fiji  0.2
17 Dec 2020 18:00 Lomawal Fiji  0.2
15 Dec 2020 10:00 Gasele Fiji  0.2
15 Dec 2020 10:00 Soso Fiji  0.2
15 Dec 2020 10:00 Kavala Fiji  0.2
15 Dec 2020 10:00 Kaduvu Fiji  0.2
15 Dec 2020 10:00 Nukuvou Fiji  0.2
15 Dec 2020 10:00 Nabouwalu Fiji  0.2
15 Dec 2020 10:00 Vabea Fiji  0.2
16 Dec 2020 12:00 Malake Fiji  0.2
16 Dec 2020 12:00 Biagunu Fiji  0.2
16 Dec 2020 12:00 Namboutini Fiji  0.2
17 Dec 2020 18:00 Nadi Fiji  0.2
16 Dec 2020 19:30 Vunivatu Fiji  0.2
17 Dec 2020 18:00 Mbatiri Fiji  0.2
16 Dec 2020 19:15 Galoa Fiji  0.2
16 Dec 2020 19:15 Yanutha Fiji  0.2
16 Dec 2020 19:15 Matavuralevu Fiji  0.2
16 Dec 2020 19:15 Pacific Harbour Fiji  0.2
16 Dec 2020 19:15 Waisomo Fiji  0.2
16 Dec 2020 19:15 Dakuimbeqa Fiji  0.2
16 Dec 2020 19:15 Lalati Fiji  0.2
16 Dec 2020 19:15 Navua Fiji  0.2
16 Dec 2020 19:15 Naitionitoni Fiji  0.2
16 Dec 2020 19:15 Mau Fiji  0.2
16 Dec 2020 05:00 Matata New Zealand  0.2
16 Dec 2020 05:00 Awakaponga New Zealand  0.2
16 Dec 2020 11:45 Naua Fiji  0.2
16 Dec 2020 11:45 Tawake Fiji  0.2
16 Dec 2020 20:00 Navukembuli Fiji  0.2
15 Dec 2020 09:45 Nasau Fiji  0.2
15 Dec 2020 09:45 Talaulia Fiji  0.2
15 Dec 2020 09:45 Nalotu Fiji  0.2
15 Dec 2020 09:45 Vunisea Fiji  0.2
15 Dec 2020 09:45 Mburelevu Fiji  0.2
15 Dec 2020 09:45 Mokoisa Fiji  0.2
15 Dec 2020 09:45 Naikorokoro Fiji  0.2
15 Dec 2020 09:45 Namara Fiji  0.2
15 Dec 2020 10:45 Vangai Fiji  0.2
15 Dec 2020 03:45 Waihi Beach New Zealand  0.2
15 Dec 2020 03:45 Athenree New Zealand  0.2
17 Dec 2020 18:00 Namukalau Fiji  0.2
15 Dec 2020 09:45 Te Puia New Zealand  0.2
15 Dec 2020 09:45 Te Puia Springs New Zealand  0.2
15 Dec 2020 09:45 Tokomaru Bay New Zealand  0.2
15 Dec 2020 09:45 Waipiro New Zealand  0.2
15 Dec 2020 09:45 Waipiro Bay New Zealand  0.2
15 Dec 2020 09:45 Whareponga New Zealand  0.2
15 Dec 2020 09:45 Tuparoa New Zealand  0.2
17 Dec 2020 18:00 Naruwai Fiji  0.2
16 Dec 2020 20:00 Elsee Fiji  0.2
16 Dec 2020 20:00 Sumi Fiji  0.2
17 Dec 2020 03:45 Makongai Fiji  0.2
16 Dec 2020 11:30 Nukusa Fiji  0.2
16 Dec 2020 11:30 Nambouono Fiji  0.2
15 Dec 2020 09:45 Korovisilou Fiji  0.2
17 Dec 2020 18:00 Cuvu Fiji  0.2
16 Dec 2020 18:45 Nakondu Fiji  0.2
16 Dec 2020 18:45 Nathamaki Fiji  0.2
16 Dec 2020 18:45 Nasau Fiji  0.2
15 Dec 2020 10:15 Sawaieke Fiji  0.2
15 Dec 2020 10:15 Vione Fiji  0.2
15 Dec 2020 10:15 Dalice Fiji  0.2
17 Dec 2020 18:00 Sigatoka Fiji  0.2
17 Dec 2020 18:00 Laselase Fiji  0.2
16 Dec 2020 19:00 Kalokolevu Fiji  0.2
15 Dec 2020 08:00 Tairua New Zealand  0.2
15 Dec 2020 08:00 Pauanui New Zealand  0.2
16 Dec 2020 04:45 Thornton New Zealand  0.2
16 Dec 2020 04:45 Poroporo New Zealand  0.2
16 Dec 2020 04:45 Whakatane New Zealand  0.2
17 Dec 2020 13:15 Vatukarasa Fiji  0.2
16 Dec 2020 19:00 Keteira Fiji  0.2
16 Dec 2020 19:00 Laucala Fiji  0.2
17 Dec 2020 13:15 Korolevu Fiji  0.2
16 Dec 2020 19:00 Vandravandra Fiji  0.2
16 Dec 2020 18:45 Korovou Fiji  0.2
16 Dec 2020 18:45 Navakawau Fiji  0.2
16 Dec 2020 19:00 Taunovo Fiji  0.1
16 Dec 2020 19:15 Suva Fiji  0.1
16 Dec 2020 19:15 Tamavua Fiji  0.1
16 Dec 2020 19:15 Lauthala Bay Fiji  0.1
16 Dec 2020 19:00 Bouwanga Fiji  0.1
16 Dec 2020 19:00 Andako Fiji  0.1
15 Dec 2020 01:45 Lakina Tuvalu  0.1
15 Dec 2020 10:45 Tonga Tuvalu  0.1
15 Dec 2020 01:45 Vaitupu Tuvalu  0.1
14 Dec 2020 21:15 Port Awanui New Zealand  0.1
14 Dec 2020 21:15 Rangitukia New Zealand  0.1
16 Dec 2020 04:45 Lower Waiawa New Zealand  0.1
16 Dec 2020 04:45 Torere New Zealand  0.1
16 Dec 2020 04:45 Houpoto New Zealand  0.1
16 Dec 2020 04:45 Omaio New Zealand  0.1
16 Dec 2020 04:45 Opotiki New Zealand  0.1
16 Dec 2020 04:45 Ohope Beach New Zealand  0.1
16 Dec 2020 04:45 Waiotahi New Zealand  0.1
16 Dec 2020 04:15 Raukokore New Zealand  0.1
16 Dec 2020 04:15 Waihau Bay New Zealand  0.1
16 Dec 2020 04:15 Cape Runaway New Zealand  0.1
16 Dec 2020 04:15 Whangaparaoa New Zealand  0.1