Overall Green Tropical Cyclone alert for SONCA-17 in Viet Nam, Laos, Thailand from 21 Jul 2017 00:00 UTC to 25 Jul 2017 00:00 UTC

25 Jul 2017 00 UTC

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Meteorological source:

GDACS JTWC

Impact Single TC

Impact based on all weather systems in the area

Impact

Tropical Cyclone SONCA-17 can have a low humanitarian impact based on the maximum sustained wind speed,exposed population and vulnerability.

Meteorological source	GDACS
Exposed countries	Viet Nam, Laos, Thailand
Exposed population	No people in Category 1 or higher
Maximum wind speed	102 km/h
Maximum storm surge	n.a.
Vulnerability	High (Vietnam)

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	83 km/h	n.a.	n.a.	0.5
Overall	102 km/h	0.0 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

83 km/h Current Max.

Up to 3.3 million 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	21 Jul 2017 00:00	102	No people	No people
2	21 Jul 2017 06:00	74	34.9 million	No people	China, Viet Nam
3	21 Jul 2017 12:00	74	8 million	No people	China
4	21 Jul 2017 18:00	56	No people	No people
5	22 Jul 2017 00:00	56	No people	No people
6	22 Jul 2017 06:00	65	2 million	No people	China
7	22 Jul 2017 12:00	56	No people	No people
8	22 Jul 2017 18:00	56	No people	No people
9	23 Jul 2017 00:00	65	No people	No people
10	23 Jul 2017 06:00	65	1.5 million	No people	China
11	23 Jul 2017 12:00	65	2.1 million	No people	China
12	23 Jul 2017 18:00	83	2 million	No people	China, Viet Nam, Laos
13	24 Jul 2017 00:00	93	4.2 million	No people	China, Viet Nam, Laos, Thailand
14	24 Jul 2017 06:00	93	5.2 million	No people	China, Viet Nam, Laos, Thailand
15	24 Jul 2017 12:00	83	2.8 million	No people	Viet Nam, Laos
16	24 Jul 2017 18:00	83	3.1 million	No people	Viet Nam, Laos
17	25 Jul 2017 00:00	83	3.3 million	No people	Viet Nam, Laos

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	21 Jul 2017 00:00	Tropical depression	56	no people	no people	17.1, 114.8
2	21 Jul 2017 06:00	Tropical depression	56	no people	no people	17.8, 113.7
3	21 Jul 2017 12:00	Tropical depression	56	no people	no people	18, 113.1
4	21 Jul 2017 18:00	Tropical depression	46	no people	no people	18.1, 112.6
5	22 Jul 2017 00:00	Tropical depression	46	no people	no people	18.2, 112.2
6	22 Jul 2017 06:00	Tropical depression	56	no people	no people	17.8, 112
7	22 Jul 2017 12:00	Tropical depression	56	no people	no people	17.7, 111.7
8	22 Jul 2017 18:00	Tropical depression	56	no people	no people	17.8, 111.2
9	23 Jul 2017 00:00	Tropical storm	65	no people	no people	17.6, 111.6
10	23 Jul 2017 06:00	Tropical storm	65	no people	no people	17.6, 111.3
11	23 Jul 2017 12:00	Tropical storm	65	no people	no people	17.4, 111.6
12	23 Jul 2017 18:00	Tropical storm	65	no people	no people	16.9, 111.6
13	24 Jul 2017 00:00	Tropical storm	74	no people	no people	17, 111.4
14	24 Jul 2017 06:00	Tropical storm	74	no people	650000 people	17, 110.9	China
15	24 Jul 2017 12:00	Tropical storm	74	no people	no people	16.8, 110.6
16	24 Jul 2017 18:00	Tropical storm	83	no people	1.8 million people	16.7, 109.8	Viet Nam
17	25 Jul 2017 00:00	Tropical storm	83	no people	2.9 million people	16.7, 108.6	Viet Nam
17	25 Jul 2017 12:00	Tropical storm	65	no people	1.1 million people	16.8, 106.8	Viet Nam
17	26 Jul 2017 00:00	Tropical depression	37	no people	no people	16.9, 105	Thailand

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
Vietnam
Laos

Provinces

Region Province	Country
Quang Nam-Da Nang	Viet Nam
Thua Thien Hue	Viet Nam
Quang Tri	Viet Nam
Xekong	Laos
Saravan	Laos
Quang Binh	Viet Nam
Savannakhet	Laos
Khammouan	Laos

Populated places

Name	Region Province	Country	City class	Population
Dà Nang	Da Nang	Vietnam	City	-
Hue	Thua Thien-Hue	Vietnam	Major city	280000 people
Quang Tri	Quang Tri	Vietnam	City	-

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)
Marble Mountain		9				0
Da Nang	DAD	6	Civ.	Paved	Yes	10000
Hue-Phu Bai	HUI	6	Civ.	Paved	No	8800
Seno	SND	185				0

Ports

Name	LOCODE	Country
Danang	VNDAD	Vietnam
Red Beach	VNRBE	Vietnam
Hue	VNHUI	Vietnam

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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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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.