Overall Green alert Tropical Cyclone for ZAZU-20
in Niue, Tonga
13 Dec 2020 12 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 GFS
Exposed countries Tonga, Niue
Exposed population No people in Category 1 or higher
Maximum wind speed 68 km/h
Maximum storm surge 0.7 m (15 Dec 20:15 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
GFS Current 68 km/h 0.7 m 19 mm 0.5
GFS Overall 281 km/h 1.1 m 672 mm 1.5

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

TOP

Wind

281 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 13 Dec 2020 12:00 UTC
CategoryCountryPopulation 
Tropical StormTonga, Niue22,636
+
Tonga21,446 
Niue1,190 

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 12:00 133 -
- - - - - Tonga, Niue
Download:





Impact estimation for the next 72h
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Rainfall





Rain exposed population - AoIs

Estimations based on the bulletin of 13 Dec 2020 12:00 UTC
LevelCountryPopulation 
250-500 mmTonga1,427 
100-250 mmWallis and Futuna, Samoa, Tonga33,318
+
Wallis and Futuna9,881 
Samoa9,434 
Tonga14,003 
50-100 mmTuvalu, Fiji, Wallis and Futuna, Samoa, Tonga, Niue473,615
+
Tuvalu3,240 
Fiji443,368 
Wallis and Futuna5,680 
Samoa17,671 
Tonga2,466 
Niue1,190 

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 12:00 384 30 thousand
- - - Tuvalu, Fiji, Wallis and Futuna, Samoa, Tonga, Niue




Impact estimation for the next 72h
TOP

StormSurge

0.7 m

The maximum Storm surge height is  0.7m in Lautoka, Fiji. This height is estimated for 15 Dec 2020 20:15 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 13 Dec 2020 12:00 UTC
    
Alert Date (UTC) Name Country Storm surge height (m)
15 Dec 2020 20:15 Lautoka Fiji  0.7
15 Dec 2020 20:15 Nailanga Fiji  0.7
15 Dec 2020 20:15 Sorokoba Fiji  0.7
15 Dec 2020 20:15 Ba Fiji  0.7
15 Dec 2020 20:00 Namaka Fiji  0.6
15 Dec 2020 20:15 Natunuka Fiji  0.5
15 Dec 2020 20:15 Tavua 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
14 Dec 2020 03:30 Korovou Fiji  0.4
14 Dec 2020 03:30 Lodoni Fiji  0.4
14 Dec 2020 03:30 Lawaki Fiji  0.4
14 Dec 2020 03:30 Ucunivanua Fiji  0.4
14 Dec 2020 03:30 Naingani Fiji  0.4
14 Dec 2020 03:30 Navuti Fiji  0.4
14 Dec 2020 03:30 Nasaga Fiji  0.4
14 Dec 2020 03:30 Rukuruku Fiji  0.4
14 Dec 2020 03:30 Lovoni Fiji  0.4
14 Dec 2020 01:45 Rabulu Fiji  0.4
14 Dec 2020 01:45 Togowere Fiji  0.4
15 Dec 2020 20:15 Soso Fiji  0.4
15 Dec 2020 20:15 Somosomo Fiji  0.4
15 Dec 2020 20:15 Solevu Fiji  0.4
15 Dec 2020 20:15 Nalauwaki Fiji  0.4
15 Dec 2020 20:00 Tavua Fiji  0.4
15 Dec 2020 20:15 Matayalevu Fiji  0.4
14 Dec 2020 02:30 Korosi Fiji  0.4
14 Dec 2020 02:30 Korotasere Fiji  0.4
14 Dec 2020 02:30 Naweni Fiji  0.4
14 Dec 2020 02:30 Viani Fiji  0.4
14 Dec 2020 02:30 Ndrekeniwai Fiji  0.4
14 Dec 2020 02:30 Mbangasau Fiji  0.4
14 Dec 2020 02:00 Matacawalevu Fiji  0.3
14 Dec 2020 02:00 Sisili Fiji  0.3
14 Dec 2020 03:15 Nauouo Fiji  0.3
14 Dec 2020 03:15 Levuka Fiji  0.3
14 Dec 2020 02:15 Naindi Fiji  0.3
14 Dec 2020 02:15 Nakarambo Fiji  0.3
15 Dec 2020 19:00 Natua Fiji  0.3
15 Dec 2020 19:00 Mbangata Fiji  0.3
15 Dec 2020 19:00 Savusavu Fiji  0.3
15 Dec 2020 12:00 Nasarowangga Fiji  0.3
15 Dec 2020 01:00 Rakiraki Fiji  0.3
15 Dec 2020 01:00 Vaileka Fiji  0.3
15 Dec 2020 01:00 Nanukuloa Fiji  0.3
14 Dec 2020 01:30 Lao Fiji  0.3
14 Dec 2020 01:30 Nailou Fiji  0.3
14 Dec 2020 01:30 Nawi Fiji  0.3
14 Dec 2020 01:30 Vunikura Fiji  0.3
14 Dec 2020 01:30 Napuka Fiji  0.3
15 Dec 2020 06:00 Otumoetai New Zealand  0.3
15 Dec 2020 06:00 Mount Maunganui New Zealand  0.3
15 Dec 2020 06:00 Matapihi New Zealand  0.3
15 Dec 2020 06:00 Kairua New Zealand  0.3
15 Dec 2020 06:00 Papamoa New Zealand  0.3
14 Dec 2020 13:00 Kasavu Fiji  0.3
14 Dec 2020 13:00 Naimasimasi Fiji  0.3
15 Dec 2020 11:45 Nanduri Fiji  0.3
15 Dec 2020 11:45 Vatutandova Fiji  0.3
15 Dec 2020 11:45 Nasea Fiji  0.3
14 Dec 2020 02:30 Malake Fiji  0.3
14 Dec 2020 02:30 Biagunu Fiji  0.3
14 Dec 2020 17:15 Nacula Fiji  0.3
14 Dec 2020 17:15 Navotua Fiji  0.3
14 Dec 2020 17:15 Tamusua Fiji  0.3
14 Dec 2020 17:15 Teci Fiji  0.3
14 Dec 2020 17:15 Mbukama Fiji  0.3
14 Dec 2020 17:15 Yasawairara Fiji  0.3
14 Dec 2020 01:30 Nasau Fiji  0.3
14 Dec 2020 17:30 Navindamu Fiji  0.3
14 Dec 2020 17:30 Nagumu Fiji  0.3
14 Dec 2020 18:15 Maketu New Zealand  0.3
14 Dec 2020 18:15 Maniatutu New Zealand  0.3
14 Dec 2020 18:15 Pukehina New Zealand  0.3
14 Dec 2020 18:15 Ohinepanea New Zealand  0.3
14 Dec 2020 18:15 Otamarakau New Zealand  0.3
14 Dec 2020 18:15 Pikowai New Zealand  0.3
16 Dec 2020 04:15 Opoutere New Zealand  0.2
16 Dec 2020 04:15 Whangamata New Zealand  0.2
15 Dec 2020 09:30 Nayavutoka Fiji  0.2
15 Dec 2020 10:15 Nabouwalu Fiji  0.2
15 Dec 2020 10:15 Thavanga Fiji  0.2
15 Dec 2020 10:15 Ndaria Fiji  0.2
15 Dec 2020 10:15 Rave-rave Fiji  0.2
16 Dec 2020 04:00 Matata New Zealand  0.2
16 Dec 2020 04:00 Awakaponga New Zealand  0.2
14 Dec 2020 03:00 Nausori Fiji  0.2
14 Dec 2020 03:00 Lokia Fiji  0.2
14 Dec 2020 03:00 Cautata Fiji  0.2
14 Dec 2020 03:00 Nasilai Fiji  0.2
14 Dec 2020 03:00 Dromuna Fiji  0.2
15 Dec 2020 12:15 Ndalomo Fiji  0.2
16 Dec 2020 11:30 Ndawara Fiji  0.2
16 Dec 2020 11:30 Waisa Fiji  0.2
16 Dec 2020 04:30 Thornton New Zealand  0.2
16 Dec 2020 04:30 Poroporo New Zealand  0.2
16 Dec 2020 04:30 Whakatane New Zealand  0.2
15 Dec 2020 09:45 Nadi Fiji  0.2
14 Dec 2020 02:15 Gasele Fiji  0.2
14 Dec 2020 02:15 Soso Fiji  0.2
14 Dec 2020 02:15 Kavala Fiji  0.2
14 Dec 2020 02:15 Kaduvu Fiji  0.2
14 Dec 2020 02:15 Nukuvou Fiji  0.2
14 Dec 2020 02:15 Nabouwalu Fiji  0.2
14 Dec 2020 02:15 Vabea Fiji  0.2
15 Dec 2020 12:15 Ndenimanu Fiji  0.2
14 Dec 2020 01:15 Naruwai Fiji  0.2
15 Dec 2020 03:45 Namboutini Fiji  0.2
14 Dec 2020 17:15 Naua Fiji  0.2
14 Dec 2020 17:15 Tawake Fiji  0.2
13 Dec 2020 17:30 Vunivatu Fiji  0.2
13 Dec 2020 17:30 Navukembuli Fiji  0.2
16 Dec 2020 04:00 Tairua New Zealand  0.2
16 Dec 2020 04:00 Pauanui New Zealand  0.2
15 Dec 2020 10:00 Vunisea Fiji  0.2
15 Dec 2020 10:00 Mburelevu Fiji  0.2
15 Dec 2020 10:00 Mokoisa Fiji  0.2
15 Dec 2020 10:00 Naikorokoro Fiji  0.2
15 Dec 2020 10:00 Namara Fiji  0.2
16 Dec 2020 04:30 Waihi Beach New Zealand  0.2
16 Dec 2020 04:30 Athenree New Zealand  0.2
14 Dec 2020 03:15 Vangai Fiji  0.2
13 Dec 2020 17:15 Namukalau Fiji  0.2
14 Dec 2020 03:00 Galoa Fiji  0.2
14 Dec 2020 03:00 Yanutha Fiji  0.2
14 Dec 2020 03:00 Matavuralevu Fiji  0.2
14 Dec 2020 03:00 Pacific Harbour Fiji  0.2
14 Dec 2020 03:00 Waisomo Fiji  0.2
14 Dec 2020 03:00 Dakuimbeqa Fiji  0.2
14 Dec 2020 03:00 Lalati Fiji  0.2
14 Dec 2020 03:00 Navua Fiji  0.2
14 Dec 2020 03:00 Naitionitoni Fiji  0.2
14 Dec 2020 03:00 Mau Fiji  0.2
15 Dec 2020 09:30 Momi Fiji  0.2
14 Dec 2020 02:45 Nakondu Fiji  0.2
14 Dec 2020 02:45 Nathamaki Fiji  0.2
14 Dec 2020 02:45 Nasau Fiji  0.2
15 Dec 2020 11:30 Sumi Fiji  0.2
15 Dec 2020 11:30 Elsee Fiji  0.2
14 Dec 2020 02:00 Korovisilou Fiji  0.2
14 Dec 2020 02:15 Vione Fiji  0.2
14 Dec 2020 02:15 Dalice Fiji  0.2
15 Dec 2020 10:15 Makongai Fiji  0.2
14 Dec 2020 04:30 Lakina Tuvalu  0.1
14 Dec 2020 04:30 Tonga Tuvalu  0.1
14 Dec 2020 17:15 Nukusa Fiji  0.1
13 Dec 2020 17:15 Nambouono Fiji  0.1
14 Dec 2020 02:00 Korovou Fiji  0.1
15 Dec 2020 09:45 Nasau Fiji  0.1
15 Dec 2020 09:45 Talaulia Fiji  0.1
15 Dec 2020 09:45 Nalotu Fiji  0.1
15 Dec 2020 10:15 Sawaieke Fiji  0.1
14 Dec 2020 02:15 Navakawau Fiji  0.1
15 Dec 2020 08:00 Te Puia New Zealand  0.1
15 Dec 2020 08:00 Te Puia Springs New Zealand  0.1
15 Dec 2020 08:00 Tokomaru Bay New Zealand  0.1
15 Dec 2020 08:00 Waipiro New Zealand  0.1
15 Dec 2020 08:00 Waipiro Bay New Zealand  0.1
15 Dec 2020 08:00 Whareponga New Zealand  0.1
15 Dec 2020 08:00 Tuparoa New Zealand  0.1
15 Dec 2020 10:00 Vandravandra Fiji  0.1
15 Dec 2020 10:00 Keteira Fiji  0.1
16 Dec 2020 04:15 Port Awanui New Zealand  0.1
16 Dec 2020 04:15 Rangitukia New Zealand  0.1
14 Dec 2020 04:30 Vaitupu Tuvalu  0.1
15 Dec 2020 10:00 Kalokolevu Fiji  0.1
16 Dec 2020 04:30 Ohope Beach New Zealand  0.1
16 Dec 2020 04:30 Waiotahi New Zealand  0.1
15 Dec 2020 10:00 Laucala Fiji  0.1
15 Dec 2020 10:00 Suva Fiji  0.1
15 Dec 2020 10:00 Tamavua Fiji  0.1
15 Dec 2020 10:00 Lauthala Bay Fiji  0.1
14 Dec 2020 02:00 Korolevu Fiji  0.1
14 Dec 2020 02:00 Vatukarasa Fiji  0.1
14 Dec 2020 02:00 Taunovo Fiji  0.1
15 Dec 2020 10:00 Andako Fiji  0.1
14 Dec 2020 02:00 Sigatoka Fiji  0.1
14 Dec 2020 02:00 Laselase Fiji  0.1
14 Dec 2020 02:00 Bouwanga Fiji  0.1
14 Dec 2020 02:00 Cuvu Fiji  0.1
16 Dec 2020 04:30 Opotiki New Zealand  0.1
16 Dec 2020 04:30 Lower Waiawa New Zealand  0.1
16 Dec 2020 04:30 Torere New Zealand  0.1
14 Dec 2020 02:00 Mbatiri Fiji  0.1
14 Dec 2020 02:00 Lomawal Fiji  0.1
16 Dec 2020 04:15 Horoera New Zealand  0.1
16 Dec 2020 04:15 East Cape New Zealand  0.1
16 Dec 2020 04:00 Hicks Bay New Zealand  0.1
16 Dec 2020 04:00 Te Araroa New Zealand  0.1