Overall Green Tropical Cyclone alert for OMAIS-21 in Japan, Marshall Islands from 10 Aug 2021 12:00 UTC to 20 Aug 2021 18:00 UTC

20 Aug 2021 18 UTC

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Meteorological source:

GDACS JTWC

Impact Single TC

Impact based on all weather systems in the area

Impact

Tropical Cyclone OMAIS-21 can have a low humanitarian impact based on the maximum sustained wind speed,exposed population and vulnerability.

Meteorological source	GDACS
Exposed countries	Japan, Marshall Islands
Exposed population	No people in Category 1 or higher
Maximum wind speed	93 km/h
Maximum storm surge
Vulnerability	High (Marshall Is.)
Landfall	between 21 Aug 2021 18:00 - 22 Aug 2021 06:00 in Japan

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	74 km/h	0.0 m	n.a.	0.5
Overall	93 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

74 km/h Current Max.

Up to 170000 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	10 Aug 2021 12:00	65	No people	No people
2	10 Aug 2021 18:00	65	No people	No people
3	11 Aug 2021 00:00	65	No people	No people
4	11 Aug 2021 06:00	65	No people	No people
5	11 Aug 2021 12:00	56	No people	No people
6	11 Aug 2021 18:00	56	No people	No people
7	12 Aug 2021 00:00	56	No people	No people
8	12 Aug 2021 06:00	56	No people	No people
9	12 Aug 2021 12:00	74	No people	No people
10	12 Aug 2021 18:00	74	4 thousand	No people	Guam
11	13 Aug 2021 00:00	83	160 thousand	No people	Guam
12	13 Aug 2021 06:00	111	170 thousand	No people	Guam
13	13 Aug 2021 12:00	120	170 thousand	No people	Guam
14	13 Aug 2021 18:00	120	170 thousand	No people	Guam
15	14 Aug 2021 00:00	130	160 thousand	No people	Guam
16	14 Aug 2021 06:00	139	170 thousand	No people	Marshall Islands, Guam
17	14 Aug 2021 12:00	139	170 thousand	No people	Marshall Islands, Guam
18	14 Aug 2021 18:00	139	170 thousand	No people	Marshall Islands, Guam
19	15 Aug 2021 00:00	139	160 thousand	No people	Marshall Islands, Guam
20	15 Aug 2021 06:00	148	160 thousand	No people	Marshall Islands, Guam
21	15 Aug 2021 12:00	139	Few people	No people	Marshall Islands
22	15 Aug 2021 18:00	139	Few people	No people	Marshall Islands
23	16 Aug 2021 00:00	139	Few people	No people	Marshall Islands
24	16 Aug 2021 06:00	139	Few people	No people	Marshall Islands
25	16 Aug 2021 12:00	139	Few people	No people	Marshall Islands
26	16 Aug 2021 18:00	139	Few people	No people	Marshall Islands
27	17 Aug 2021 00:00	130	Few people	No people	Marshall Islands
28	17 Aug 2021 06:00	37	Few people	No people	Marshall Islands
29	19 Aug 2021 12:00	74	10 thousand	No people	Japan, Marshall Islands
30	19 Aug 2021 18:00	83	1.3 million	No people	Japan, Marshall Islands
31	20 Aug 2021 00:00	83	430 thousand	No people	Japan, Marshall Islands
32	20 Aug 2021 06:00	74	60 thousand	No people	Japan, Marshall Islands
33	20 Aug 2021 12:00	74	110 thousand	No people	Japan, Marshall Islands
34	20 Aug 2021 18:00	74	170 thousand	No people	Japan, Republic of Korea, Marshall Islands

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	10 Aug 2021 12:00	Tropical depression	46	no people	no people	12.2, 179
2	10 Aug 2021 18:00	Tropical depression	56	no people	no people	12.3, 178
3	11 Aug 2021 00:00	Tropical depression	56	no people	no people	12.3, 177.2
4	11 Aug 2021 06:00	Tropical depression	56	no people	no people	12.4, 176.6
5	11 Aug 2021 12:00	Tropical depression	56	no people	no people	12.1, 175.9
6	11 Aug 2021 18:00	Tropical depression	56	no people	no people	12.1, 175
7	12 Aug 2021 00:00	Tropical depression	46	no people	no people	12.1, 174
8	12 Aug 2021 06:00	Tropical depression	46	no people	no people	12.8, 172.7
9	12 Aug 2021 12:00	Tropical depression	56	no people	no people	12.6, 171.3
10	12 Aug 2021 18:00	Tropical depression	56	no people	no people	12.6, 169.9
11	13 Aug 2021 00:00	Tropical storm	65	no people	no people	12.7, 168.6
12	13 Aug 2021 06:00	Tropical storm	65	no people	no people	12.8, 167
13	13 Aug 2021 12:00	Tropical storm	65	no people	no people	12.8, 166.2
14	13 Aug 2021 18:00	Tropical depression	56	no people	no people	12.5, 164.9
15	14 Aug 2021 00:00	Tropical depression	56	no people	no people	12.5, 163.2
16	14 Aug 2021 06:00	Tropical storm	65	no people	<1000 people	12.3, 161.7
17	14 Aug 2021 12:00	Tropical storm	65	no people	no people	12.3, 160.3
18	14 Aug 2021 18:00	Tropical storm	65	no people	no people	12.3, 159
19	15 Aug 2021 00:00	Tropical depression	56	no people	no people	12.5, 157
20	15 Aug 2021 06:00	Tropical depression	56	no people	no people	12.7, 154.7
21	15 Aug 2021 12:00	Tropical depression	46	no people	no people	12.8, 154.4
22	15 Aug 2021 18:00	Tropical depression	46	no people	no people	12.9, 152.9
23	16 Aug 2021 00:00	Tropical depression	46	no people	no people	13.1, 151.3
24	16 Aug 2021 06:00	Tropical depression	37	no people	no people	13.6, 149.8
25	16 Aug 2021 12:00	Tropical depression	37	no people	no people	13.5, 148.2
26	16 Aug 2021 18:00	Tropical depression	37	no people	no people	12.9, 146.3
27	17 Aug 2021 00:00	Tropical depression	37	no people	no people	13.3, 145.1
28	17 Aug 2021 06:00	Tropical depression	37	no people	no people	13.4, 143.9
29	19 Aug 2021 12:00	Tropical depression	46	no people	no people	18.4, 132.9
30	19 Aug 2021 18:00	Tropical depression	56	no people	no people	18.5, 132.2
31	20 Aug 2021 00:00	Tropical depression	56	no people	no people	19, 130.9
32	20 Aug 2021 06:00	Tropical depression	56	no people	no people	19.1, 130.1
33	20 Aug 2021 12:00	Tropical depression	56	no people	no people	19.2, 129.5
34	20 Aug 2021 18:00	Tropical storm	65	no people	no people	20, 129.1
34	21 Aug 2021 06:00	Tropical storm	74	no people	no people	21.4, 127.6
34	21 Aug 2021 18:00	Tropical storm	74	no people	99000 people	22.8, 126.4
34	22 Aug 2021 06:00	Tropical storm	74	no people	110000 people	24.6, 125.5	Japan
34	22 Aug 2021 18:00	Tropical storm	65	no people	58000 people	27, 125.2
34	23 Aug 2021 18:00	Tropical depression	37	no people	no people	33.8, 128.1

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
Japan
South Korea
Marshall Is.

Provinces

Region Province	Country
Okinawa	Japan
Kyushu	Japan
Cheju-do	Republic of Korea
Marshall Is.	Marshall Islands

Populated places

Name	Region Province	Country	City class	Population
Ishigaki	Okinawa	Japan	City	45000 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)
Hirara	MMY	45	Civ.	Paved	Yes	6500
Shimojishima	SHI	16	Civ.	Paved	Yes	9800
		9				0
Ishigaki	ISG	26	Civ.	Paved	Yes	4900
Kumejima	UEO	7	Civ.	Paved	Yes	6500
Enewetak Aux Af	ENT	4	Mil.	Paved	No	7700

Ports

Name	LOCODE	Country
Myako Island		Japan
Hirara		Japan
Ishigaki		Japan
Ishigaki Island		Japan
Kume Island		Japan
Tomie		Japan
Sonsan Po		South Korea
Eniwetok		Marshall Islands

Dams

Reservoir	Dam Name	River	Year
Sokobaru	Sokobaru	Sokobarugawa	1992
Maezato	Maezato	Miyaragawa	1982
Nagura	Nagura	Naguragawa	1996

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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.

Locations affected by Storm surge (0 locations). Calculation based on advisory number 4 of 11 Aug 2021 06:00:00 UTC. (Simulation using 0.5 minute resolution)

Alert

Date (UTC)

Name

Country

Storm surge height (m)