Overall Green Tropical Cyclone alert for POLA-19 in Tonga from 26 Feb 2019 00:00 UTC to 06:00

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

Overall Green alert Tropical Cyclone for POLA-19

in Tonga

26 Feb 2019 06 UTC

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Meteorological source:

GDACS JTWC

Impact Single TC

GFS
HWRF
ECMWF

Impact based on all weather systems in the area

Impact

Tropical Cyclone POLA-19 can have a low humanitarian impact based on the maximum sustained wind speed,exposed population and vulnerability.

Meteorological source	GDACS
Exposed countries	Tonga
Exposed population	No people in Category 1 or higher
Maximum wind speed	176 km/h
Maximum storm surge	0.3 m (26 Feb 03:00 UTC)
Vulnerability	Medium (Tonga)

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
Current	93 km/h	0.1 m	n.a.	0.5
Overall	176 km/h	0.3 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

93 km/h Current Max.

Up to 89000 people in Tropical Storm strength or higher (see SSHS)

Impact Timeline

Alert	N°	Date (UTC)	Max Winds (km/h)	Population in Tropical Storm or higher	Population in Cat 1. or higher	Countries
	1	26 Feb 2019 00:00	93	120 thousand	No people	Tonga
	2	26 Feb 2019 06:00	93	90 thousand	No people	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	26 Feb 2019 00:00	Tropical storm	65	no people	17000 people	-14.9, -175.8	Tonga
2	26 Feb 2019 06:00	Tropical storm	65	no people	<1000 people	-15.9, -176
2	26 Feb 2019 18:00	Tropical storm	74	no people	84000 people	-18.1, -176.4	Tonga
2	27 Feb 2019 06:00	Tropical storm	83	no people	87000 people	-20.2, -177.2	Tonga
2	27 Feb 2019 18:00	Tropical storm	93	no people	<1000 people	-22.2, -177.7
2	28 Feb 2019 06:00	Tropical storm	83	no people	no people	-24.4, -177.7
2	01 Mar 2019 06:00	Tropical storm	74	no people	no people	-28.3, -176.3

Actual track of the current bulletin

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

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Exposed population - AoIs

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

Countries

Country
Tonga

Provinces

Region Province	Country
Tonga	Tonga

Populated places

Name	Region Province	Country	City class	Population
Nuku'alofa		Tonga	Capital	24000 people

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)
Ono-I-Lau	ONU	unknown				0
Fua'amotu International	TBU	38	Civ.	Paved	Yes	8700
Eua Kaufana	EUA	unknown				0

Ports

Name	LOCODE	Country
Nuku'alofa	TOTBU	Tonga
Ata Island		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

0.3 m

The maximum Storm surge height is 0.3m in Esia, Fiji. This height is estimated for 26 Feb 2019 03:00 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 (16 locations). Calculation based on advisory number 2 of 26 Feb 2019 06:00:00 UTC. (Simulation using 0.5 minute resolution)

Alert	Date (UTC)	Name	Country	Storm surge height (m)
	26 Feb 2019 03:00	Esia	Fiji	0.3
	26 Feb 2019 03:00	Ndaria	Fiji	0.1
	26 Feb 2019 03:00	Napuka	Fiji	0.1
	27 Feb 2019 01:00	Ndalomo	Fiji	0.1
	26 Feb 2019 02:00	Leava	Wallis and Futuna	0.1
	26 Feb 2019 02:00	Alo	Wallis and Futuna	0.1
	26 Feb 2019 02:00	Mua	Wallis and Futuna	0.1
	26 Feb 2019 02:00	Mua	Wallis and Futuna	0.1
	26 Feb 2019 02:00	Mata-Utu	Wallis and Futuna	0.1
	26 Feb 2019 02:00	Hihifo	Tonga	0.1
	26 Feb 2019 02:00	Falehau	Tonga	0.1
	26 Feb 2019 03:00	Rave-rave	Fiji	0.1
	26 Feb 2019 03:00	Mbangata	Fiji	0.1
	26 Feb 2019 03:00	Savusavu	Fiji	0.1
	26 Feb 2019 03:00	Naindi	Fiji	0.1
	26 Feb 2019 03:00	Fuailalo	Samoa	0.1

Disclaimer
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.
The JRC is not responsible for any damage or loss resulting from the use of the information presented on this website.
The designations employed and the presentation of material on the map do not imply the expression of any opinion whatsoever on the part of the European Union concerning the legal status of any country, territory or area or of its authorities, or concerning the delimitation of its frontiers or boundaries.