Overall Green Tropical Cyclone for ZAZU-20 in Niue, Tonga from 13 Dec 2020 12:00 UTC to 16 Dec 2020 06:00 UTC

GDACS is a cooperation framework between the United Nations, the European Commission and disaster managers worldwide to improve awareness, information exchange and coordination in the first phase after major sudden-onset disasters.

Overall Green Tropical Cyclone for ZAZU-20

in Niue, Tonga

16 Dec 2020 06 UTC

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Meteorological source:

GDACS JTWC

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	GDACS
Exposed countries	Niue, Tonga
Exposed population	No people in Category 1 or higher
Maximum wind speed	102 km/h
Maximum storm surge	0.2 m (15 Dec 01:00 UTC)
Vulnerability	High (Niue)

GDACS Score

GDACS score for Tropical Cyclones is 0.5 (GREEN Level), 1.5 (ORANGE Level), 2.5 (RED Level)
For more info on GDACS core click here.

	Wind	Storm surge	Rainfall	GDACS score
Current	102 km/h	0.2 m	n.a.	0.5
Overall	102 km/h	0.2 m	n.a.	0.5
Maximum winds, storm surge, rainfall (Current: over the next 72 h, Overall: entire TC track) based on GDACS impact

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Wind

102 km/h Current Max.

Up to 110000 people in Tropical Storm strength or higher (see SSHS)

Impact Timeline

N°	Date (UTC)	Max Winds (km/h)	Population in Tropical Storm or higher	Population in Cat 1. or higher	Countries
1	13 Dec 2020 12:00	102	110 thousand	No people	Tonga, Niue
2	13 Dec 2020 18:00	102	110 thousand	No people	Tonga, Niue
3	14 Dec 2020 00:00	111	30 thousand	No people	Tonga, Niue
4	14 Dec 2020 06:00	111	110 thousand	No people	Tonga, Niue
5	14 Dec 2020 12:00	111	110 thousand	No people	Tonga, Niue
6	14 Dec 2020 18:00	102	110 thousand	No people	Tonga, Niue
7	15 Dec 2020 00:00	102	110 thousand	No people	Tonga, Niue
8	15 Dec 2020 06:00	83	110 thousand	No people	Tonga, Niue
9	15 Dec 2020 12:00	102	110 thousand	No people	Tonga, Niue
10	15 Dec 2020 18:00	102	110 thousand	No people	Niue, Tonga
11	16 Dec 2020 00:00	102	110 thousand	No people	Niue, Tonga
12	16 Dec 2020 06:00	102	110 thousand	No people	Niue, Tonga

Bulletin Timeline

N°	Date (UTC)	Category (SSHS)	Max winds (km/h)	Population in Cat.1 or higher	Population in Tropical Storm or higher	Location (lat, lon)	Countries
1	13 Dec 2020 12:00	Tropical storm	65	no people	23000 people	-17, -173.4
2	13 Dec 2020 18:00	Tropical storm	65	no people	22000 people	-17.7, -173.8
3	14 Dec 2020 00:00	Tropical storm	74	no people	23000 people	-17.9, -174.1
4	14 Dec 2020 06:00	Tropical storm	83	no people	100000 people	-18.3, -174.3
5	14 Dec 2020 12:00	Tropical storm	83	no people	110000 people	-18.8, -174.5
6	14 Dec 2020 18:00	Tropical storm	83	no people	110000 people	-18.9, -174.2
7	15 Dec 2020 00:00	Tropical storm	93	no people	110000 people	-18.8, -174	Tonga
8	15 Dec 2020 06:00	Tropical storm	83	no people	110000 people	-19, -173.6
9	15 Dec 2020 12:00	Tropical storm	93	no people	34000 people	-19.6, -172.4
10	15 Dec 2020 18:00	Tropical storm	102	no people	22000 people	-20.2, -171.2
11	16 Dec 2020 00:00	Tropical storm	102	no people	1200 people	-21, -170.2
12	16 Dec 2020 06:00	Tropical storm	102	no people	<1000 people	-21.8, -168.8
12	16 Dec 2020 18:00	Tropical storm	102	no people	no people	-25.5, -166.6

Actual track of the current bulletin

The alert for forecast greater than 3 days is limited to Orange level.

Download:

Exposed population - AoIs

Exposed population in the potential affected countries, provinces and populated places

Countries

Country
Niue
Tonga

Provinces

Region Province	Country
Niue	Niue
Tonga	Tonga

Critical infrastructure

Airports, ports, nuclear plants and hydrodams at risk, if affected, are listed below.

Airports

Name	IATA Code	Elevation (m)	Usage	Runway type	IFR	Runway Length (ft)
Niue Hanan	IUE	64	Civ.	Paved	Yes	7600
Haapai	HPA	12	Civ.	Unpaved	Yes	3900
Eua Kaufana	EUA	unknown				0
Vavau International	VAV	72	Civ.	Unpaved	Yes	5500
Fua'amotu International	TBU	38	Civ.	Paved	Yes	8700

Ports

Name	LOCODE	Country
Alofi		Niue
Pangai	TOPAN	Tonga
Eua Island		Tonga
Neiafu	TONEI	Tonga
Nuku'alofa	TOTBU	Tonga

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Rainfall

Rainfall accumulation of the past 24h, as detected by the Global Precipitation Measurement mission of NASA. For more information, see https://www.nasa.gov/mission_pages/GPM/main/index.html.

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StormSurge

0.2 m

The maximum Storm surge height is 0.2m in Neiafu, Tonga. This height is estimated for 15 Dec 2020 01:00 UTC .

The JRC has developed an experimental global storm surge model. 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.

Locations affected by Storm surge (1 locations). Calculation based on advisory number 12 of 16 Dec 2020 06:00:00 UTC. (Simulation using 6 minute resolution)

Level	Date (UTC)	Name	Country	Storm surge height (m)
	15 Dec 2020 01:00	Neiafu	Tonga	0.2

Disclaimer - Copyright
While we try everything to ensure accuracy, this information is purely indicative and should not be used for any decision making without alternate sources of information.
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