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 HWRF
Exposed countries Tonga, Niue
Exposed population No people in Category 1 or higher
Maximum wind speed 112 km/h
Maximum storm surge 1.1 m (17 Dec 06:45 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 112 km/h 1.1 m 640 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)

TOP

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 16 Dec 2020 18:00 UTC
CategoryCountryPopulation 
Tropical StormTonga, Niue22,441
+
Tonga21,251 
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 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 90 -
- - - - - Tonga
GREEN 7 15 Dec 2020 00:00 112 -
- - - - - Tonga
GREEN 8 15 Dec 2020 06:00 86 -
- - - - - Tonga
GREEN 9 15 Dec 2020 12:00 90 -
- - - - - Niue
GREEN 10 15 Dec 2020 18:00 94 -
- - - - - Niue
GREEN 11 16 Dec 2020 00:00 112 -
- - - - - Niue
GREEN 12 16 Dec 2020 06:00 104 - - - - - - -
GREEN 13 16 Dec 2020 12:00 104 - - - - - - -
GREEN 14 16 Dec 2020 18:00 108 - - - - - - -
Download:





Impact estimation for the next 72h
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Rainfall





Rain exposed population - AoIs

Estimations based on the bulletin of 16 Dec 2020 18:00 UTC
LevelCountryPopulation 
100-250 mmTonga15,237 
50-100 mmTonga, Niue1,884
+
Tonga694 
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 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 25 9 thousand - - - - - - Tonga
Blue 7 15 Dec 2020 00:00 31 5 thousand - - - - - - Tonga
Blue 8 15 Dec 2020 06:00 24 2 thousand - - - - - - Tonga
Blue 9 15 Dec 2020 12:00 25 1 thousand - - - - - - Niue
Blue 10 15 Dec 2020 18:00 26 1 thousand - - - - - - Niue
Blue 11 16 Dec 2020 00:00 31 1 thousand - - - - - - Niue
Blue 12 16 Dec 2020 06:00 29 - - - - - - -
Blue 13 16 Dec 2020 12:00 29 - - - - - - -
Blue 14 16 Dec 2020 18:00 225 - - - - - - -




Impact estimation for the next 72h
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StormSurge

1.1 m

The maximum Storm surge height is  1.1m in Nanukuloa, Fiji. This height is estimated for 17 Dec 2020 06:45 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
    
Alert Date (UTC) Name Country Storm surge height (m)
17 Dec 2020 06:45 Nanukuloa Fiji  1.1
17 Dec 2020 06:45 Nasau Fiji  1.1
17 Dec 2020 06:45 Nayavutoka Fiji  1.1
17 Dec 2020 03:15 Koroinasolo Fiji  1.0
17 Dec 2020 03:15 Savu Sau Fiji  1.0
17 Dec 2020 03:15 Navinggiri Fiji  1.0
17 Dec 2020 03:15 Yangganga Fiji  1.0
17 Dec 2020 03:15 Nawailevu Fiji  1.0
17 Dec 2020 06:15 Navindamu Fiji  0.9
17 Dec 2020 06:15 Nagumu Fiji  0.9
17 Dec 2020 07:15 Korovou Fiji  0.8
17 Dec 2020 07:15 Lodoni Fiji  0.8
17 Dec 2020 07:15 Lawaki Fiji  0.8
17 Dec 2020 07:15 Naingani Fiji  0.8
17 Dec 2020 07:15 Navuti Fiji  0.8
17 Dec 2020 07:15 Nasaga Fiji  0.8
17 Dec 2020 07:15 Rukuruku Fiji  0.8
17 Dec 2020 07:15 Lovoni Fiji  0.8
17 Dec 2020 06:45 Ndalomo Fiji  0.8
17 Dec 2020 03:45 Ndenimanu Fiji  0.8
17 Dec 2020 06:45 Ucunivanua Fiji  0.8
17 Dec 2020 06:30 Nanduri Fiji  0.8
17 Dec 2020 06:30 Vatutandova Fiji  0.8
17 Dec 2020 06:30 Nasea Fiji  0.8
17 Dec 2020 07:00 Kasavu Fiji  0.7
17 Dec 2020 07:00 Naimasimasi Fiji  0.7
17 Dec 2020 00:15 Nacula Fiji  0.7
17 Dec 2020 00:15 Navotua Fiji  0.7
17 Dec 2020 00:15 Tamusua Fiji  0.7
17 Dec 2020 00:15 Teci Fiji  0.7
17 Dec 2020 00:15 Mbukama Fiji  0.7
17 Dec 2020 00:15 Yasawairara Fiji  0.7
17 Dec 2020 06:30 Nasarowangga Fiji  0.7
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 06:45 Nausori Fiji  0.7
17 Dec 2020 06:45 Lokia Fiji  0.7
17 Dec 2020 06:45 Cautata Fiji  0.7
17 Dec 2020 06:45 Nasilai Fiji  0.7
17 Dec 2020 06:45 Dromuna Fiji  0.7
17 Dec 2020 06:45 Rakiraki Fiji  0.6
17 Dec 2020 06:45 Vaileka Fiji  0.6
17 Dec 2020 06:15 Naruwai Fiji  0.6
17 Dec 2020 06:15 Nabouwalu Fiji  0.6
17 Dec 2020 07:00 Nauouo Fiji  0.6
17 Dec 2020 07:00 Levuka Fiji  0.6
17 Dec 2020 06:30 Thavanga Fiji  0.6
16 Dec 2020 20:00 Nalauwaki Fiji  0.6
14 Dec 2020 02:15 Lautoka Fiji  0.6
14 Dec 2020 02:15 Nailanga Fiji  0.6
14 Dec 2020 02:15 Sorokoba Fiji  0.6
14 Dec 2020 02:15 Ba Fiji  0.6
16 Dec 2020 20:30 Vunivatu Fiji  0.6
16 Dec 2020 20:30 Navukembuli Fiji  0.6
16 Dec 2020 20:30 Naua Fiji  0.6
16 Dec 2020 20:30 Namukalau Fiji  0.6
17 Dec 2020 08:00 Korosi Fiji  0.6
17 Dec 2020 08:00 Korotasere Fiji  0.6
17 Dec 2020 08:00 Naweni Fiji  0.6
17 Dec 2020 08:00 Viani Fiji  0.6
17 Dec 2020 08:00 Ndrekeniwai Fiji  0.6
17 Dec 2020 08:00 Mbangasau Fiji  0.6
17 Dec 2020 16:15 Sawaieke Fiji  0.5
17 Dec 2020 16:15 Vione Fiji  0.5
17 Dec 2020 16:15 Dalice Fiji  0.5
17 Dec 2020 06:15 Ndaria Fiji  0.5
17 Dec 2020 06:15 Rave-rave Fiji  0.5
17 Dec 2020 15:30 Vandravandra Fiji  0.5
15 Dec 2020 20:00 Natunuka Fiji  0.5
17 Dec 2020 12:15 Makongai Fiji  0.5
15 Dec 2020 20:00 Namaka Fiji  0.5
17 Dec 2020 03:30 Togowere Fiji  0.5
17 Dec 2020 06:30 Waisa Fiji  0.5
16 Dec 2020 20:15 Tavua Fiji  0.5
16 Dec 2020 20:15 Solevu Fiji  0.5
17 Dec 2020 07:15 Ndawara Fiji  0.5
17 Dec 2020 12:15 Nakondu Fiji  0.5
17 Dec 2020 12:15 Nathamaki Fiji  0.5
17 Dec 2020 12:15 Nasau Fiji  0.5
16 Dec 2020 20:00 Lao Fiji  0.5
16 Dec 2020 20:00 Nailou Fiji  0.5
16 Dec 2020 20:00 Nawi Fiji  0.5
16 Dec 2020 20:00 Vunikura Fiji  0.5
16 Dec 2020 20:00 Napuka Fiji  0.5
14 Dec 2020 02:00 Tavua Fiji  0.4
17 Dec 2020 19:30 Keteira Fiji  0.4
16 Dec 2020 20:15 Rabulu Fiji  0.4
17 Dec 2020 06:15 Te Puia New Zealand  0.4
17 Dec 2020 06:15 Te Puia Springs New Zealand  0.4
17 Dec 2020 06:15 Tokomaru Bay New Zealand  0.4
17 Dec 2020 06:15 Waipiro New Zealand  0.4
17 Dec 2020 06:15 Waipiro Bay New Zealand  0.4
17 Dec 2020 06:15 Whareponga New Zealand  0.4
17 Dec 2020 06:15 Tuparoa New Zealand  0.4
15 Dec 2020 21:00 Gasele Fiji  0.4
15 Dec 2020 21:00 Soso Fiji  0.4
15 Dec 2020 21:00 Kavala Fiji  0.4
15 Dec 2020 21:00 Kaduvu Fiji  0.4
15 Dec 2020 21:00 Nukuvou Fiji  0.4
15 Dec 2020 21:00 Nabouwalu Fiji  0.4
15 Dec 2020 21:00 Vabea Fiji  0.4
17 Dec 2020 07:30 Nakarambo Fiji  0.4
17 Dec 2020 04:00 Malake Fiji  0.4
17 Dec 2020 04:00 Biagunu Fiji  0.4
16 Dec 2020 18:30 Natua Fiji  0.4
16 Dec 2020 18:30 Mbangata Fiji  0.4
16 Dec 2020 18:30 Savusavu Fiji  0.4
16 Dec 2020 18:30 Naindi Fiji  0.4
17 Dec 2020 08:00 Namboutini Fiji  0.4
18 Dec 2020 00:45 Andako Fiji  0.4
16 Dec 2020 19:45 Vangai Fiji  0.3
16 Dec 2020 19:15 Tawake Fiji  0.3
16 Dec 2020 19:15 Nukusa Fiji  0.3
17 Dec 2020 12:00 Laucala Fiji  0.3
16 Dec 2020 19:30 Nadi Fiji  0.3
17 Dec 2020 04:15 Vunisea Fiji  0.3
17 Dec 2020 04:15 Mburelevu Fiji  0.3
17 Dec 2020 04:15 Mokoisa Fiji  0.3
17 Dec 2020 04:15 Naikorokoro Fiji  0.3
17 Dec 2020 04:15 Namara Fiji  0.3
16 Dec 2020 19:45 Momi Fiji  0.3
16 Dec 2020 19:15 Nambouono Fiji  0.3
17 Dec 2020 19:30 Galoa Fiji  0.3
17 Dec 2020 19:30 Yanutha Fiji  0.3
17 Dec 2020 19:30 Matavuralevu Fiji  0.3
17 Dec 2020 19:30 Pacific Harbour Fiji  0.3
17 Dec 2020 19:30 Waisomo Fiji  0.3
17 Dec 2020 19:30 Dakuimbeqa Fiji  0.3
17 Dec 2020 19:30 Lalati Fiji  0.3
17 Dec 2020 19:30 Navua Fiji  0.3
17 Dec 2020 19:30 Naitionitoni Fiji  0.3
17 Dec 2020 19:30 Mau Fiji  0.3
17 Dec 2020 12:00 Suva Fiji  0.3
17 Dec 2020 12:00 Tamavua Fiji  0.3
17 Dec 2020 12:00 Lauthala Bay Fiji  0.3
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
16 Dec 2020 18:45 Lomawal Fiji  0.3
17 Dec 2020 05:00 Korovisilou Fiji  0.3
17 Dec 2020 12:15 Navakawau Fiji  0.3
15 Dec 2020 08:00 Opoutere New Zealand  0.3
15 Dec 2020 08:00 Whangamata New Zealand  0.3
17 Dec 2020 13:00 Kalokolevu Fiji  0.3
17 Dec 2020 12:30 Korovou Fiji  0.3
16 Dec 2020 18:45 Mbatiri Fiji  0.3
14 Dec 2020 11:15 Maketu New Zealand  0.3
14 Dec 2020 11:15 Maniatutu New Zealand  0.3
14 Dec 2020 11:15 Pukehina New Zealand  0.3
14 Dec 2020 11:15 Ohinepanea New Zealand  0.3
14 Dec 2020 11:15 Otamarakau New Zealand  0.3
14 Dec 2020 11:15 Pikowai New Zealand  0.3
16 Dec 2020 12:45 Tairua New Zealand  0.2
16 Dec 2020 12:45 Pauanui New Zealand  0.2
17 Dec 2020 20:15 Nasau Fiji  0.2
17 Dec 2020 20:15 Talaulia Fiji  0.2
17 Dec 2020 20:15 Nalotu Fiji  0.2
16 Dec 2020 19:00 Korolevu Fiji  0.2
15 Dec 2020 08:30 Waihi Beach New Zealand  0.2
15 Dec 2020 08:30 Athenree New Zealand  0.2
17 Dec 2020 04:45 Port Awanui New Zealand  0.2
17 Dec 2020 04:45 Rangitukia New Zealand  0.2
17 Dec 2020 04:45 Horoera New Zealand  0.2
17 Dec 2020 04:45 East Cape New Zealand  0.2
16 Dec 2020 19:00 Vatukarasa Fiji  0.2
16 Dec 2020 19:15 Cuvu Fiji  0.2
16 Dec 2020 15:30 Matata New Zealand  0.2
16 Dec 2020 15:30 Awakaponga New Zealand  0.2
16 Dec 2020 15:30 Thornton New Zealand  0.2
16 Dec 2020 15:30 Poroporo New Zealand  0.2
16 Dec 2020 15:30 Whakatane New Zealand  0.2
16 Dec 2020 19:15 Sigatoka Fiji  0.2
16 Dec 2020 19:15 Laselase Fiji  0.2
16 Dec 2020 19:00 Taunovo Fiji  0.2
17 Dec 2020 05:15 Bouwanga Fiji  0.2
16 Dec 2020 19:45 Sumi Fiji  0.2
16 Dec 2020 19:45 Elsee Fiji  0.2
16 Dec 2020 04:45 Lower Waiawa New Zealand  0.2
16 Dec 2020 04:45 Torere New Zealand  0.2
16 Dec 2020 04:45 Houpoto New Zealand  0.2
16 Dec 2020 04:45 Omaio New Zealand  0.2
17 Dec 2020 02:45 Ohope Beach New Zealand  0.2
17 Dec 2020 02:45 Waiotahi New Zealand  0.2
17 Dec 2020 00:30 Hicks Bay New Zealand  0.2
17 Dec 2020 00:30 Te Araroa New Zealand  0.2
17 Dec 2020 23:45 Opotiki New Zealand  0.2
19 Dec 2020 13:00 Tonga Tuvalu  0.2
19 Dec 2020 13:00 Lakina Tuvalu  0.2
19 Dec 2020 13:00 Vaitupu Tuvalu  0.2
18 Dec 2020 12:00 Raukokore New Zealand  0.1
18 Dec 2020 12:00 Waihau Bay New Zealand  0.1
18 Dec 2020 12:00 Cape Runaway New Zealand  0.1
18 Dec 2020 12:00 Whangaparaoa New Zealand  0.1
17 Dec 2020 13:15 Te Kaha New Zealand  0.1