Overall Green alert Tropical Cyclone for ZAZU-20
in Niue, Tonga
15 Dec 2020 06 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 86 km/h
Maximum storm surge 1.0 m (17 Dec 10:45 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 86 km/h 1.0 m 24 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 3 thousand can be affected by wind speeds of Tropical Storm strength or above



Wind exposed population - AoIs

Estimations based on the bulletin of 15 Dec 2020 06:00 UTC
CategoryCountryPopulation 
Tropical StormTonga, Niue3,133
+
Tonga1,949 
Niue1,184 

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 06:00 137 -
- - - - - Tonga, Niue
Download:





Impact estimation for the next 72h
TOP

Rainfall





Rain exposed population - AoIs

Estimations based on the bulletin of 15 Dec 2020 06:00 UTC
LevelCountryPopulation 
100-250 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 25 9 thousand - - - - - - Tonga
Blue 7 15 Dec 2020 00:00 31 5 thousand - - - - - - Tonga
Blue 8 15 Dec 2020 06:00 374 1 thousand -
- - - - Niue




Impact estimation for the next 72h
TOP

StormSurge

1 m

The maximum Storm surge height is  1.0m in Natunuka, Fiji. This height is estimated for 17 Dec 2020 10:45 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 15 Dec 2020 06:00 UTC
    
Alert Date (UTC) Name Country Storm surge height (m)
17 Dec 2020 10:45 Natunuka Fiji  1.0
17 Dec 2020 10:45 Tavua Fiji  1.0
17 Dec 2020 10:45 Rabulu Fiji  1.0
17 Dec 2020 10:45 Togowere Fiji  1.0
17 Dec 2020 09:15 Matacawalevu Fiji  0.9
17 Dec 2020 09:15 Sisili Fiji  0.9
17 Dec 2020 09:15 Nacula Fiji  0.9
17 Dec 2020 09:15 Navotua Fiji  0.9
17 Dec 2020 09:15 Tamusua Fiji  0.9
17 Dec 2020 09:15 Teci Fiji  0.9
17 Dec 2020 09:15 Mbukama Fiji  0.9
17 Dec 2020 09:15 Yasawairara Fiji  0.9
17 Dec 2020 08:45 Nalauwaki Fiji  0.8
17 Dec 2020 14:30 Soso Fiji  0.8
17 Dec 2020 14:30 Somosomo Fiji  0.8
17 Dec 2020 10:30 Nailanga Fiji  0.7
17 Dec 2020 10:30 Sorokoba Fiji  0.7
17 Dec 2020 10:30 Ba Fiji  0.7
17 Dec 2020 13:15 Rakiraki Fiji  0.7
17 Dec 2020 13:15 Vaileka Fiji  0.7
17 Dec 2020 13:15 Nanukuloa Fiji  0.7
17 Dec 2020 07:45 Matayalevu Fiji  0.7
17 Dec 2020 13:30 Nasau Fiji  0.7
17 Dec 2020 13:30 Nayavutoka Fiji  0.7
17 Dec 2020 10:30 Lautoka Fiji  0.7
17 Dec 2020 18:30 Kasavu Fiji  0.6
17 Dec 2020 18:30 Nausori Fiji  0.6
17 Dec 2020 18:30 Korovou Fiji  0.6
17 Dec 2020 18:30 Lokia Fiji  0.6
17 Dec 2020 18:30 Naimasimasi Fiji  0.6
17 Dec 2020 18:30 Ucunivanua Fiji  0.6
17 Dec 2020 18:30 Cautata Fiji  0.6
17 Dec 2020 18:30 Nasilai Fiji  0.6
17 Dec 2020 18:30 Dromuna Fiji  0.6
17 Dec 2020 18:15 Lodoni Fiji  0.6
17 Dec 2020 18:15 Lawaki Fiji  0.6
17 Dec 2020 18:15 Naingani Fiji  0.6
17 Dec 2020 08:15 Tavua Fiji  0.6
15 Dec 2020 20:00 Namaka Fiji  0.5
17 Dec 2020 18:30 Navuti Fiji  0.5
17 Dec 2020 18:30 Nasaga Fiji  0.5
17 Dec 2020 18:30 Koroinasolo Fiji  0.5
17 Dec 2020 18:30 Savu Sau Fiji  0.5
17 Dec 2020 18:30 Navinggiri Fiji  0.5
17 Dec 2020 18:30 Yangganga Fiji  0.5
17 Dec 2020 18:30 Ndalomo Fiji  0.5
17 Dec 2020 18:30 Rukuruku Fiji  0.5
17 Dec 2020 18:30 Lovoni Fiji  0.5
17 Dec 2020 21:30 Nauouo Fiji  0.5
17 Dec 2020 21:30 Levuka Fiji  0.5
17 Dec 2020 18:30 Nawailevu Fiji  0.5
17 Dec 2020 08:15 Solevu Fiji  0.5
17 Dec 2020 18:45 Navindamu Fiji  0.5
17 Dec 2020 18:45 Nagumu Fiji  0.5
17 Dec 2020 14:00 Nadi Fiji  0.5
17 Dec 2020 18:30 Ndenimanu Fiji  0.5
17 Dec 2020 18:30 Nasarowangga Fiji  0.4
17 Dec 2020 20:15 Galoa Fiji  0.4
17 Dec 2020 20:15 Yanutha Fiji  0.4
17 Dec 2020 20:15 Matavuralevu Fiji  0.4
17 Dec 2020 20:15 Pacific Harbour Fiji  0.4
17 Dec 2020 20:15 Waisomo Fiji  0.4
17 Dec 2020 20:15 Dakuimbeqa Fiji  0.4
17 Dec 2020 20:15 Lalati Fiji  0.4
17 Dec 2020 20:15 Navua Fiji  0.4
17 Dec 2020 20:15 Naitionitoni Fiji  0.4
17 Dec 2020 20:15 Mau 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
17 Dec 2020 21:15 Laucala Fiji  0.4
17 Dec 2020 20:00 Kalokolevu Fiji  0.4
17 Dec 2020 20:00 Suva Fiji  0.4
17 Dec 2020 20:00 Tamavua Fiji  0.4
17 Dec 2020 20:00 Lauthala Bay 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
16 Dec 2020 18:30 Korosi Fiji  0.4
15 Dec 2020 20:00 Gasele Fiji  0.4
15 Dec 2020 20:00 Soso Fiji  0.4
15 Dec 2020 20:00 Kavala Fiji  0.4
15 Dec 2020 20:00 Kaduvu Fiji  0.4
15 Dec 2020 20:00 Nukuvou Fiji  0.4
15 Dec 2020 20:00 Nabouwalu Fiji  0.4
15 Dec 2020 20:00 Vabea Fiji  0.4
17 Dec 2020 18:45 Makongai Fiji  0.4
18 Dec 2020 03:45 Vandravandra Fiji  0.4
17 Dec 2020 19:45 Korotasere Fiji  0.4
17 Dec 2020 19:45 Naweni Fiji  0.4
17 Dec 2020 19:45 Viani Fiji  0.4
17 Dec 2020 19:45 Ndrekeniwai Fiji  0.4
17 Dec 2020 19:45 Mbangasau Fiji  0.4
18 Dec 2020 02:45 Sawaieke Fiji  0.4
17 Dec 2020 18:45 Nabouwalu Fiji  0.4
18 Dec 2020 03:00 Vione Fiji  0.3
18 Dec 2020 03:00 Dalice Fiji  0.3
17 Dec 2020 18:30 Naruwai Fiji  0.3
17 Dec 2020 18:30 Thavanga Fiji  0.3
17 Dec 2020 20:00 Korovisilou Fiji  0.3
16 Dec 2020 18:45 Ndaria Fiji  0.3
16 Dec 2020 18:45 Rave-rave Fiji  0.3
17 Dec 2020 13:30 Momi Fiji  0.3
17 Dec 2020 20:00 Vunisea Fiji  0.3
17 Dec 2020 20:00 Mburelevu Fiji  0.3
17 Dec 2020 20:00 Mokoisa Fiji  0.3
17 Dec 2020 20:00 Naikorokoro Fiji  0.3
17 Dec 2020 20:00 Namara Fiji  0.3
17 Dec 2020 20:00 Korolevu Fiji  0.3
15 Dec 2020 23:15 Lao Fiji  0.3
15 Dec 2020 23:15 Nailou Fiji  0.3
15 Dec 2020 23:15 Nawi Fiji  0.3
15 Dec 2020 23:15 Vunikura Fiji  0.3
15 Dec 2020 23:15 Napuka Fiji  0.3
16 Dec 2020 18:30 Ndawara Fiji  0.3
16 Dec 2020 18:30 Waisa Fiji  0.3
17 Dec 2020 20:00 Vatukarasa Fiji  0.3
17 Dec 2020 13:30 Lomawal Fiji  0.3
17 Dec 2020 18:00 Vunivatu Fiji  0.3
17 Dec 2020 18:00 Navukembuli Fiji  0.3
17 Dec 2020 18:00 Naua 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 01:30 Nakarambo Fiji  0.3
18 Dec 2020 06:00 Keteira Fiji  0.3
17 Dec 2020 20:00 Taunovo 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 20:00 Sigatoka Fiji  0.3
17 Dec 2020 20:00 Laselase Fiji  0.3
17 Dec 2020 18:00 Namukalau Fiji  0.3
17 Dec 2020 20:00 Bouwanga Fiji  0.3
17 Dec 2020 14:00 Mbatiri Fiji  0.3
17 Dec 2020 18:45 Cuvu Fiji  0.3
18 Dec 2020 04:45 Andako Fiji  0.3
17 Dec 2020 19:00 Nakondu Fiji  0.2
17 Dec 2020 19:00 Nathamaki Fiji  0.2
17 Dec 2020 19:00 Nasau Fiji  0.2
17 Dec 2020 06:00 Malake Fiji  0.2
17 Dec 2020 06:00 Biagunu Fiji  0.2
17 Dec 2020 05:00 Namboutini Fiji  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
15 Dec 2020 10:30 Tawake Fiji  0.2
15 Dec 2020 08:30 Waihi Beach New Zealand  0.2
15 Dec 2020 08:30 Athenree New Zealand  0.2
16 Dec 2020 11:30 Vangai Fiji  0.2
15 Dec 2020 18:30 Te Puia New Zealand  0.2
15 Dec 2020 18:30 Te Puia Springs New Zealand  0.2
15 Dec 2020 18:30 Tokomaru Bay New Zealand  0.2
15 Dec 2020 18:30 Waipiro New Zealand  0.2
15 Dec 2020 18:30 Waipiro Bay New Zealand  0.2
15 Dec 2020 18:30 Whareponga New Zealand  0.2
15 Dec 2020 18:30 Tuparoa New Zealand  0.2
15 Dec 2020 06:15 Tairua New Zealand  0.2
15 Dec 2020 06:15 Pauanui New Zealand  0.2
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 18:00 Nukusa Fiji  0.2
17 Dec 2020 18:00 Nambouono Fiji  0.2
17 Dec 2020 19:15 Navakawau Fiji  0.2
16 Dec 2020 20:00 Elsee Fiji  0.2
16 Dec 2020 20:00 Sumi Fiji  0.2
17 Dec 2020 19:15 Korovou Fiji  0.2
16 Dec 2020 03:15 Matata New Zealand  0.2
16 Dec 2020 03:15 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
15 Dec 2020 10:30 Tonga Tuvalu  0.1
15 Dec 2020 10:45 Lakina Tuvalu  0.1
15 Dec 2020 21:30 Lower Waiawa New Zealand  0.1
15 Dec 2020 21:30 Torere New Zealand  0.1
15 Dec 2020 21:30 Houpoto New Zealand  0.1
15 Dec 2020 21:30 Omaio New Zealand  0.1
15 Dec 2020 18:45 Port Awanui New Zealand  0.1
15 Dec 2020 18:45 Rangitukia New Zealand  0.1
15 Dec 2020 18:45 Horoera New Zealand  0.1
15 Dec 2020 18:45 East Cape New Zealand  0.1
18 Dec 2020 04:00 Vaitupu Tuvalu  0.1
16 Dec 2020 12:00 Opotiki New Zealand  0.1