Overall Green alert Tropical Cyclone for ZAZU-20
in Niue, Tonga
16 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 GFS
Exposed countries Fiji, Tonga, Niue
Exposed population 70 thousand in Category 1 or higher
Maximum wind speed 281 km/h
Maximum storm surge 1.1 m (17 Dec 03:30 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 281 km/h 1.1 m 672 mm 1.5
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 70 thousand in Category 1 strength or higher (see SSHS)



Wind exposed population - AoIs

Estimations based on the bulletin of 16 Dec 2020 18:00 UTC (Overall situation)
CategoryCountryPopulation 
CAT. 3Fiji173 
CAT. 2Fiji27,914 
CAT. 1Fiji44,140 
Tropical StormFiji, Tonga, Niue632,262
+
Fiji608,977 
Tonga22,095 
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 68 -
- - - - - Tonga
GREEN 2 13 Dec 2020 18:00 68 -
- - - - - Tonga
GREEN 3 14 Dec 2020 00:00 79 - - - - - - -
GREEN 4 14 Dec 2020 06:00 94 -
- - - - - Tonga
GREEN 5 14 Dec 2020 12:00 97 -
- - - - - Tonga
GREEN 6 14 Dec 2020 18:00 90 -
- - - - - Tonga
GREEN 7 15 Dec 2020 00:00 112 -
- - - - - Tonga
GREEN 8 15 Dec 2020 06:00 112 -
- - - - - Niue
GREEN 9 15 Dec 2020 12:00 97 -
- - - - - Niue
GREEN 10 15 Dec 2020 18:00 104 -
- - - - - Niue
GREEN 11 16 Dec 2020 00:00 122 -
- - - - - Niue
GREEN 12 16 Dec 2020 06:00 173 -
- - - - - Fiji
GREEN 13 16 Dec 2020 12:00 191 -
- - - - - Fiji
ORANGE 14 16 Dec 2020 18:00 281 70 thousand
- - Fiji
Download:





Impact estimation for the next 72h
TOP

Rainfall





Rain exposed population - AoIs

Estimations based on the bulletin of 16 Dec 2020 18:00 UTC (Overall situation)
LevelCountryPopulation 
500-750 mmFiji112,091 
250-500 mmFiji364,103 
100-250 mmTuvalu, Wallis and Futuna, Samoa, American Samoa, Tonga, Fiji, Niue631,920
+
Tuvalu481 
American Samoa37,109 
Fiji359,056 
Wallis and Futuna15,561 
Samoa196,628 
Tonga21,895 
Niue1,190 
50-100 mmTuvalu, Tokelau, American Samoa, Fiji, Cook Islands, Tonga90,754
+
Tuvalu2,495 
Tokelau1,337 
American Samoa17,408 
Fiji67,957 
Tonga1,523 
Cook Islands34 

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 19 Few people - - - - - - Tonga
Blue 2 13 Dec 2020 18:00 19 Few people - - - - - - Tonga
Blue 3 14 Dec 2020 00:00 22 - - - - - - -
Blue 4 14 Dec 2020 06:00 26 20 thousand - - - - - - Tonga
Blue 5 14 Dec 2020 12:00 27 20 thousand - - - - - - Tonga
Blue 6 14 Dec 2020 18:00 25 20 thousand - - - - - - Tonga
Blue 7 15 Dec 2020 00:00 31 20 thousand - - - - - - Tonga
Blue 8 15 Dec 2020 06:00 31 1 thousand - - - - - - Niue
Blue 9 15 Dec 2020 12:00 27 1 thousand - - - - - - Niue
Blue 10 15 Dec 2020 18:00 29 1 thousand - - - - - - Niue
Blue 11 16 Dec 2020 00:00 34 1 thousand - - - - - - Niue
Blue 12 16 Dec 2020 06:00 48 10 thousand - - - - - - Fiji
Blue 13 16 Dec 2020 12:00 53 10 thousand - - - - - - Fiji
Blue 14 16 Dec 2020 18:00 562 650 thousand
- - Tuvalu, Wallis and Futuna, Samoa, American Samoa, Tonga, Fiji, Niue




Impact estimation for the next 72h
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StormSurge

1.1 m

The maximum Storm surge height is  1.1m in Koroinasolo, Fiji. This height is estimated for 17 Dec 2020 03:30 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 16 Dec 2020 18:00 UTC (Overall situation)
    
Alert Date (UTC) Name Country Storm surge height (m)
17 Dec 2020 03:30 Koroinasolo Fiji  1.1
17 Dec 2020 03:30 Savu Sau Fiji  1.1
17 Dec 2020 03:30 Navinggiri Fiji  1.1
17 Dec 2020 03:30 Yangganga Fiji  1.1
17 Dec 2020 03:30 Nawailevu Fiji  1.1
17 Dec 2020 07:00 Nanukuloa Fiji  1.0
17 Dec 2020 07:00 Nasau Fiji  1.0
17 Dec 2020 07:00 Nayavutoka Fiji  1.0
17 Dec 2020 06:15 Navindamu Fiji  1.0
17 Dec 2020 06:15 Nagumu Fiji  1.0
17 Dec 2020 06:15 Ndalomo Fiji  0.9
17 Dec 2020 06:15 Nasarowangga Fiji  0.9
16 Dec 2020 20:15 Soso Fiji  0.7
16 Dec 2020 20:15 Somosomo Fiji  0.7
16 Dec 2020 20:15 Matayalevu Fiji  0.7
16 Dec 2020 20:15 Matacawalevu Fiji  0.7
16 Dec 2020 20:15 Sisili Fiji  0.7
17 Dec 2020 07:00 Korovou Fiji  0.7
17 Dec 2020 07:00 Lodoni Fiji  0.7
17 Dec 2020 07:00 Lawaki Fiji  0.7
17 Dec 2020 07:00 Naingani Fiji  0.7
17 Dec 2020 07:00 Navuti Fiji  0.7
17 Dec 2020 07:00 Nasaga Fiji  0.7
17 Dec 2020 07:00 Rukuruku Fiji  0.7
17 Dec 2020 07:00 Lovoni Fiji  0.7
17 Dec 2020 06:30 Ndenimanu Fiji  0.7
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
17 Dec 2020 07:30 Kasavu Fiji  0.7
17 Dec 2020 07:30 Naimasimasi Fiji  0.7
17 Dec 2020 07:30 Ucunivanua Fiji  0.7
17 Dec 2020 08:15 Nanduri Fiji  0.6
17 Dec 2020 08:15 Vatutandova Fiji  0.6
17 Dec 2020 08:15 Nasea Fiji  0.6
16 Dec 2020 20:00 Nalauwaki Fiji  0.6
15 Dec 2020 20:15 Namaka Fiji  0.6
17 Dec 2020 10:30 Nausori Fiji  0.6
17 Dec 2020 10:30 Lokia Fiji  0.6
17 Dec 2020 10:30 Cautata Fiji  0.6
17 Dec 2020 10:30 Nasilai Fiji  0.6
17 Dec 2020 10:30 Dromuna Fiji  0.6
15 Dec 2020 20:00 Natunuka Fiji  0.6
16 Dec 2020 20:30 Nacula Fiji  0.6
16 Dec 2020 20:30 Navotua Fiji  0.6
16 Dec 2020 20:30 Tamusua Fiji  0.6
16 Dec 2020 20:30 Teci Fiji  0.5
17 Dec 2020 00:30 Mbukama Fiji  0.5
17 Dec 2020 00:30 Yasawairara Fiji  0.5
15 Dec 2020 20:15 Tavua Fiji  0.5
16 Dec 2020 20:30 Tavua Fiji  0.5
17 Dec 2020 01:00 Rabulu Fiji  0.5
17 Dec 2020 01:00 Togowere Fiji  0.5
17 Dec 2020 04:15 Rakiraki Fiji  0.5
17 Dec 2020 04:15 Vaileka Fiji  0.5
17 Dec 2020 07:15 Nauouo Fiji  0.5
17 Dec 2020 07:15 Levuka Fiji  0.5
16 Dec 2020 20:30 Solevu Fiji  0.5
17 Dec 2020 06:00 Lao Fiji  0.4
17 Dec 2020 06:00 Nailou Fiji  0.4
17 Dec 2020 06:00 Nawi Fiji  0.4
17 Dec 2020 06:00 Vunikura Fiji  0.4
17 Dec 2020 06:00 Napuka Fiji  0.4
17 Dec 2020 07:45 Korosi Fiji  0.4
17 Dec 2020 07:45 Korotasere Fiji  0.4
17 Dec 2020 07:45 Naweni Fiji  0.4
17 Dec 2020 07:45 Viani Fiji  0.4
17 Dec 2020 07:45 Ndrekeniwai Fiji  0.4
17 Dec 2020 07:45 Mbangasau Fiji  0.4
17 Dec 2020 08:30 Vunivatu Fiji  0.4
17 Dec 2020 08:30 Navukembuli Fiji  0.4
17 Dec 2020 08:30 Naua Fiji  0.4
17 Dec 2020 08:30 Namukalau Fiji  0.4
15 Dec 2020 20:45 Natua Fiji  0.4
15 Dec 2020 20:45 Mbangata Fiji  0.4
15 Dec 2020 20:45 Savusavu Fiji  0.4
15 Dec 2020 20:45 Naindi Fiji  0.4
17 Dec 2020 04:30 Nabouwalu Fiji  0.4
17 Dec 2020 04:30 Thavanga Fiji  0.4
17 Dec 2020 04:30 Ndaria Fiji  0.4
17 Dec 2020 04:30 Rave-rave Fiji  0.4
17 Dec 2020 04:30 Gasele Fiji  0.4
17 Dec 2020 04:30 Soso Fiji  0.4
17 Dec 2020 04:30 Kavala Fiji  0.4
17 Dec 2020 04:30 Kaduvu Fiji  0.4
17 Dec 2020 04:30 Nukuvou Fiji  0.4
17 Dec 2020 04:30 Nabouwalu Fiji  0.4
17 Dec 2020 04:30 Vabea Fiji  0.4
17 Dec 2020 07:15 Nakarambo Fiji  0.4
16 Dec 2020 19:45 Nadi Fiji  0.4
17 Dec 2020 04:15 Makongai Fiji  0.4
17 Dec 2020 07:15 Malake Fiji  0.4
17 Dec 2020 07:15 Biagunu Fiji  0.4
16 Dec 2020 20:00 Naruwai Fiji  0.4
17 Dec 2020 16:15 Galoa Fiji  0.4
17 Dec 2020 16:15 Yanutha Fiji  0.4
17 Dec 2020 16:15 Matavuralevu Fiji  0.4
17 Dec 2020 16:15 Pacific Harbour Fiji  0.4
17 Dec 2020 16:15 Waisomo Fiji  0.4
17 Dec 2020 16:15 Dakuimbeqa Fiji  0.4
17 Dec 2020 16:15 Lalati Fiji  0.4
17 Dec 2020 16:15 Navua Fiji  0.4
17 Dec 2020 16:15 Naitionitoni Fiji  0.4
17 Dec 2020 16:15 Mau Fiji  0.4
17 Dec 2020 04:30 Ndawara Fiji  0.3
17 Dec 2020 04:30 Waisa Fiji  0.3
16 Dec 2020 19:30 Vangai Fiji  0.3
17 Dec 2020 03:30 Namboutini 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
17 Dec 2020 16:30 Vione Fiji  0.3
17 Dec 2020 16:30 Dalice Fiji  0.3
18 Dec 2020 11:45 Te Puia New Zealand  0.3
18 Dec 2020 11:45 Te Puia Springs New Zealand  0.3
18 Dec 2020 11:45 Tokomaru Bay New Zealand  0.3
18 Dec 2020 11:45 Waipiro New Zealand  0.3
18 Dec 2020 11:45 Waipiro Bay New Zealand  0.3
18 Dec 2020 11:45 Whareponga New Zealand  0.3
18 Dec 2020 11:45 Tuparoa New Zealand  0.3
17 Dec 2020 03:45 Nakondu Fiji  0.3
17 Dec 2020 03:45 Nathamaki Fiji  0.3
17 Dec 2020 03:45 Nasau Fiji  0.3
16 Dec 2020 19:45 Momi Fiji  0.3
17 Dec 2020 16:15 Keteira Fiji  0.3
17 Dec 2020 13:15 Opoutere New Zealand  0.3
17 Dec 2020 13:15 Whangamata New Zealand  0.3
17 Dec 2020 04:15 Sawaieke Fiji  0.3
17 Dec 2020 04:15 Kalokolevu Fiji  0.3
17 Dec 2020 04:15 Suva Fiji  0.3
17 Dec 2020 04:15 Tamavua Fiji  0.3
17 Dec 2020 04:15 Lauthala Bay Fiji  0.3
17 Dec 2020 04:15 Laucala Fiji  0.3
17 Dec 2020 04:00 Nasau Fiji  0.3
17 Dec 2020 04:00 Talaulia Fiji  0.3
17 Dec 2020 04:00 Nalotu Fiji  0.3
17 Dec 2020 04:00 Vunisea Fiji  0.3
17 Dec 2020 04:00 Mburelevu Fiji  0.3
17 Dec 2020 04:00 Mokoisa Fiji  0.3
17 Dec 2020 04:00 Naikorokoro Fiji  0.3
17 Dec 2020 04:00 Namara Fiji  0.3
17 Dec 2020 16:00 Vandravandra Fiji  0.3
17 Dec 2020 04:15 Korovisilou Fiji  0.3
17 Dec 2020 09:00 Tawake Fiji  0.3
17 Dec 2020 04:45 Lomawal Fiji  0.3
17 Dec 2020 04:45 Mbatiri Fiji  0.3
17 Dec 2020 04:30 Cuvu Fiji  0.3
17 Dec 2020 04:30 Sigatoka Fiji  0.3
17 Dec 2020 04:30 Laselase Fiji  0.3
17 Dec 2020 04:30 Vatukarasa Fiji  0.3
17 Dec 2020 04:30 Korolevu Fiji  0.3
18 Dec 2020 00:45 Tairua New Zealand  0.3
18 Dec 2020 00:45 Pauanui New Zealand  0.3
17 Dec 2020 06:00 Nukusa Fiji  0.3
17 Dec 2020 19:15 Andako Fiji  0.3
17 Dec 2020 06:00 Nambouono Fiji  0.3
17 Dec 2020 04:30 Taunovo Fiji  0.2
17 Dec 2020 04:00 Korovou Fiji  0.2
17 Dec 2020 04:00 Navakawau Fiji  0.2
17 Dec 2020 04:30 Bouwanga Fiji  0.2
16 Dec 2020 15:45 Maketu New Zealand  0.2
16 Dec 2020 15:45 Maniatutu New Zealand  0.2
16 Dec 2020 15:45 Pukehina New Zealand  0.2
16 Dec 2020 15:45 Ohinepanea New Zealand  0.2
16 Dec 2020 15:45 Otamarakau New Zealand  0.2
16 Dec 2020 15:45 Pikowai New Zealand  0.2
14 Dec 2020 18:30 Waihi Beach New Zealand  0.2
14 Dec 2020 18:30 Athenree New Zealand  0.2
16 Dec 2020 19:00 Matata New Zealand  0.2
16 Dec 2020 19:00 Awakaponga New Zealand  0.2
15 Dec 2020 05:45 Thornton New Zealand  0.2
15 Dec 2020 05:45 Poroporo New Zealand  0.2
15 Dec 2020 05:45 Whakatane New Zealand  0.2
16 Dec 2020 20:00 Sumi Fiji  0.2
16 Dec 2020 20:00 Elsee Fiji  0.2
15 Dec 2020 18:45 Port Awanui New Zealand  0.2
15 Dec 2020 18:45 Rangitukia New Zealand  0.2
17 Dec 2020 13:00 Ohope Beach New Zealand  0.2
14 Dec 2020 04:30 Lakina Tuvalu  0.1
14 Dec 2020 04:30 Tonga Tuvalu  0.1
16 Dec 2020 15:45 Hicks Bay New Zealand  0.1
16 Dec 2020 15:45 Te Araroa New Zealand  0.1
16 Dec 2020 15:45 Horoera New Zealand  0.1
16 Dec 2020 15:45 East Cape New Zealand  0.1
15 Dec 2020 11:00 Vaitupu Tuvalu  0.1
18 Dec 2020 21:15 Waiotahi New Zealand  0.1
18 Dec 2020 21:45 Opotiki New Zealand  0.1
18 Dec 2020 21:45 Lower Waiawa New Zealand  0.1
18 Dec 2020 21:45 Torere New Zealand  0.1
18 Dec 2020 21:45 Houpoto New Zealand  0.1