Overall Green Tropical Cyclone for KROVANH-26 in Japan from 01 Sep 2026 06:00 UTC to 02 Sep 2026 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 KROVANH-26

in Japan

click on

to select bulletin time

Meteorological source:

GDACS JTWC

Impact Single TC

Impact based on all weather systems in the area

Impact

Tropical Cyclone KROVANH-26 can have a low humanitarian impact based on the maximum sustained wind speed,exposed population and vulnerability.

Meteorological source	GDACS
Exposed countries	Japan
Exposed population	No people in Category 1 or higher
Maximum wind speed	83 km/h
Maximum storm surge	n.a.
Vulnerability	Low (Japan)

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

TOP

Wind

83 km/h Current Max.

Up to 1.5 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	01 Sep 2026 06:00	83	1.5 million	No people	Japan
2	01 Sep 2026 12:00	83	1.5 million	No people	Japan
3	01 Sep 2026 18:00	83	1.5 million	No people	Japan
4	02 Sep 2026 00:00	74	1.5 million	No people	Japan
5	02 Sep 2026 06:00	83	1.5 million	No people	Japan

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)
1	01 Sep 2026 06:00	Tropical storm	65	no people	no people	22.5, 131.5
2	01 Sep 2026 12:00	Tropical storm	65	no people	no people	22, 132.7
3	01 Sep 2026 18:00	Tropical storm	65	no people	no people	22, 133.4
4	02 Sep 2026 00:00	Tropical depression	56	no people	no people	22.6, 132.9
5	02 Sep 2026 06:00	Tropical storm	65	no people	2300 people	23.1, 132.4
5	02 Sep 2026 18:00	Tropical storm	65	no people	1.5 million people	24.7, 130.9
5	03 Sep 2026 06:00	Tropical storm	74	no people	1.5 million people	26.5, 129.5
5	03 Sep 2026 18:00	Tropical storm	74	no people	1.5 million people	28, 128.4
5	04 Sep 2026 06:00	Tropical storm	83	no people	1.5 million people	28.6, 128
5	04 Sep 2026 18:00	Tropical storm	74	no people	1.5 million people	28.3, 128
5	05 Sep 2026 06:00	Tropical storm	74	no people	1.5 million people	27.5, 128.3
5	06 Sep 2026 06:00	Tropical storm	65	no people	1.5 million people	26.4, 129
5	07 Sep 2026 06:00	Tropical storm	65	no people	no people	26, 130.2

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	Population in Tropical Storm or higher strength
Japan	1.2 million people

Provinces

Region Province	Country	Population in Tropical Storm or higher strength
Okinawa	Japan	1.1 million people
Kyushu	Japan	84000 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)
Minami Daito	MMD	4	Civ.	Paved	Yes	4900
Kitadaito	KTD	24	Civ.	Paved	Yes	4900
Futenma Mcas		75	Mil.	Paved	Yes	9000
Naha	OKA	5	Civ.	Paved	Yes	9800
Kadena AB	DNA	45	Mil.	Paved	Yes	12100
Yoron	RNJ	16	Civ.	Paved	Yes	3900
Okierabu	OKE	31	Civ.	Paved	Yes	3900
Ie Jima	IEJ	75	Civ.	Paved	No	4900
Kikai		6	Civ.	Paved	Yes	3900
Tokunoshima	TKN	5	Civ.	Paved	Yes	6500
Amami O Shima	ASJ	8	Civ.	Paved	Yes	6500
Kumejima	UEO	7	Civ.	Paved	Yes	6500
Yakushima	KUM	37	Civ.	Paved	Yes	4900

Ports

Name	LOCODE	Country
Okino		Japan
Kita		Japan
Nakagusuku Wan		Japan
Kin Wan	JPKIN	Japan
Heianza	JPHEI	Japan
Nishihara	JPNHR	Japan
Oku		Japan
Naha	JPNAH	Japan
Kume Island		Japan
Tokara Island		Japan

Dams

Reservoir	Dam Name	River	Year
Kannako	Kanna	Kannafukujigawa	1993
	Okukubi	Okukubigawa	2001
Zukeyama	Kurashiki	Yonabarugawa	1995

TOP

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.

...

TOP

StormSurge

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.

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.
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.