Overall Green Tropical Cyclone for CHAN-HOM-26 in Japan from 07 Aug 2026 00:00 UTC to 11 Aug 2026 18:00 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 CHAN-HOM-26

in Japan

Meteorological source:

GDACS JTWC

Impact Single TC

Impact based on all weather systems in the area

Impact

Tropical Cyclone CHAN-HOM-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	93 km/h
Maximum storm surge	0.6 m (11 Aug 10:00 UTC)
Vulnerability	Low (Japan)
Landfall	between 11 Aug 2026 06:00 - 11 Aug 2026 12:00 in 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	56 km/h	0.1 m	n.a.	0.5
Overall	93 km/h	0.6 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

56 km/h Current Max.

Up to 54.1 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	07 Aug 2026 00:00	93	56.1 million	No people	Japan, Russian Federation
2	07 Aug 2026 06:00	93	23.4 million	No people	Japan
3	07 Aug 2026 12:00	74	5.1 million	No people	Japan
4	07 Aug 2026 18:00	83	9.3 million	No people	Japan
5	08 Aug 2026 00:00	93	16.3 million	No people	Japan
6	08 Aug 2026 06:00	93	10.2 million	No people	Japan
7	08 Aug 2026 12:00	102	13.4 million	No people	Japan
8	08 Aug 2026 18:00	93	15.6 million	No people	Japan
9	09 Aug 2026 00:00	102	21 million	No people	Japan
10	09 Aug 2026 06:00	93	34.3 million	No people	Japan
11	09 Aug 2026 12:00	93	62.5 million	No people	Japan
12	09 Aug 2026 18:00	83	44.5 million	No people	Japan
13	10 Aug 2026 00:00	83	54.2 million	No people	Japan
14	10 Aug 2026 06:00	93	50.8 million	No people	Japan
15	10 Aug 2026 12:00	93	61.3 million	No people	Japan
16	10 Aug 2026 18:00	83	67 million	No people	Japan
17	11 Aug 2026 00:00	93	57.6 million	No people	Japan
18	11 Aug 2026 06:00	74	71.4 million	No people	Japan
19	11 Aug 2026 12:00	65	54.7 million	No people	Japan
20	11 Aug 2026 18:00	56	54.1 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)	Countries
1	07 Aug 2026 00:00	Tropical storm	83	no people	no people	29.2, 160.8
2	07 Aug 2026 06:00	Tropical storm	74	no people	no people	29.7, 160.4
3	07 Aug 2026 12:00	Tropical depression	56	no people	no people	31, 159.8
4	07 Aug 2026 18:00	Tropical depression	56	no people	no people	32, 158.1
5	08 Aug 2026 00:00	Tropical storm	65	no people	no people	32.4, 156.5
6	08 Aug 2026 06:00	Tropical storm	65	no people	no people	33, 154.9
7	08 Aug 2026 12:00	Tropical storm	74	no people	no people	33.1, 153.2
8	08 Aug 2026 18:00	Tropical storm	74	no people	no people	32.7, 151.7
9	09 Aug 2026 00:00	Tropical storm	83	no people	no people	32.4, 151
10	09 Aug 2026 06:00	Tropical storm	74	no people	no people	32.3, 150.7
11	09 Aug 2026 12:00	Tropical storm	65	no people	no people	32.3, 150.7
12	09 Aug 2026 18:00	Tropical storm	65	no people	no people	33.2, 150.2
13	10 Aug 2026 00:00	Tropical storm	74	no people	no people	33.7, 149.7
14	10 Aug 2026 06:00	Tropical storm	74	no people	no people	34.8, 148.8
15	10 Aug 2026 12:00	Tropical storm	83	no people	no people	35.5, 147.9
16	10 Aug 2026 18:00	Tropical storm	83	no people	7 million people	36.8, 145.9
17	11 Aug 2026 00:00	Tropical storm	93	no people	48.5 million people	36.8, 143.7
18	11 Aug 2026 06:00	Tropical storm	74	no people	71.5 million people	36.5, 142
19	11 Aug 2026 12:00	Tropical storm	65	no people	42.9 million people	36, 140	Japan
20	11 Aug 2026 18:00	Tropical depression	56	no people	no people	35.8, 137.4	Japan
20	12 Aug 2026 06:00	Tropical depression	37	no people	no people	36.1, 133.8
20	12 Aug 2026 18:00	Tropical depression	37	no people	no people	36.1, 131.3

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

Critical infrastructure

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

Nuclear Facilities

Site Name	Type	Name	Country
Site-Kawasaki	Research Reactor	Musashi Reactor	Japan
Site-Tokyo	Research Reactor	HTR	Japan
Site-Kashiwazaki Kariwa	Nuclear Power Reactor	Kashiwazaki Kariwa-3	Japan
Site-Kashiwazaki Kariwa	Nuclear Power Reactor	Kashiwazaki Kariwa-4	Japan
Site-Kashiwazaki Kariwa	Nuclear Power Reactor	Kashiwazaki Kariwa-1	Japan
Site-Kashiwazaki Kariwa	Nuclear Power Reactor	Kashiwazaki Kariwa-5	Japan
Site-Kashiwazaki Kariwa	Nuclear Power Reactor	Kashiwazaki Kariwa-7	Japan
Site-Kashiwazaki Kariwa	Nuclear Power Reactor	Kashiwazaki Kariwa-6	Japan
Site-Kashiwazaki Kariwa	Nuclear Power Reactor	Kashiwazaki Kariwa-2	Japan
Site-Kanagawa	Research Reactor	TRIGA-II Rikkyo	Japan
Site-Kawasaki	Research Reactor	Toshiba NCA	Japan
Site-Kanagawa	Research Reactor	TTR	Japan
Site-Kanagawa	Nuclear Fuel Cycle	LEU fabrication plant	Japan
Site-Yokosuga	Nuclear Fuel Cycle	GNF-J (LEU Fabrication plant)	Japan
Site-T?kai-baraki	Nuclear Fuel Cycle	NFI-T (LEU Fabrication Plant)	Japan
Site-Ibaraki	Nuclear Fuel Cycle	Nuclear Fuel Development (NFD)	Japan
Site-Higashiibaraki-gun	Research Reactor	JMTR	Japan
Site-?arai	Research reactor	HTTR	Japan
Site-Oarai	Research Reactor	JOYO	Japan
Site-Oarai-machi	Research Reactor	DCA	Japan
Site-Naka District 319-1111	Nuclear Fuel Cycle	MitsubishiNuclear Fuels Ltd(MNF) - Okegawa Plant	Japan
Site-Ibaraki-2	Nuclear Fuel Cycle	Plutonium Fuel Production Facility (PFPF-FBR)	Japan
Site-Naka District 319-1112	Nuclear Fuel Cycle	MNF-Fuel Fabrication Facility	Japan
Site-Naka District 319-1112	Nuclear Fuel Cycle	MNF-Reconversion facility	Japan
Site-Tokai-Mura	Research Reactor	JRR-4	Japan
Site-Oarai-Ibaraki	Research Reactor	JRR-3M	Japan
Site-Tokai-Mura	Research Reactor	JRR-2	Japan
Site-Tokai-Ibaraki	Nuclear Fuel Cycle	Toaki Reprocessing Plant (JNC-1)	Japan
Site-Tokai-Naka	Research Reactor	YAYOI	Japan
Site-Tokai-Naka	Research Reactor	TRACY	Japan
Site-Tokai-Mura	Research Reactor	FCA	Japan
Site-Tokai-Naka	Research Reactor	TCA Tank Critical Assembly	Japan
Site-Tokai-Mura	Research Reactor	STACY	Japan
Site-Ibaraki	Research reactor	NSRR	Japan
Site-Tokai	Nuclear Power Reactor	Tokai-1	Japan
Site-Tokai	Nuclear Fuel Cycle	JAEA Tokai (PFDF-MOX)	Japan
Site-Tokai	Nuclear Fuel Cycle	Tokai Works	Japan
Site-Tokai	Nuclear Power Reactor	Tokai-2	Japan
Site-Tokai	Nuclear Fuel Cycle	Tokai II NPP Site SFSF	Japan
Site-Nahara-machi	Nuclear Power Reactor	FUKUSHIMA-DAINI-2	Japan
Site-Nahara-machi	Nuclear Power Reactor	FUKUSHIMA-DAINI-4	Japan
Site-Nahara-machi	Nuclear Power Reactor	FUKUSHIMA-DAINI-1	Japan
Site-Nahara-machi	Nuclear Power Reactor	FUKUSHIMA-DAINI-3	Japan
Site-Fukushima	Nuclear Fuel Cycle	AFR Dry Spent Fuel Storage	Japan
Site-Fukushima	Nuclear Fuel Cycle	AFR Wet Spent Fuel Storage (Pool)	Japan
Site-?kuma-machi	Nuclear Power Reactor	FUKUSHIMA-DAIICHI-2	Japan
Site-?kuma-machi	Nuclear Power Reactor	FUKUSHIMA-DAIICHI-4	Japan
Site-?kuma-machi	Nuclear Power Reactor	FUKUSHIMA-DAIICHI-1	Japan
Site-?kuma-machi	Nuclear Power Reactor	FUKUSHIMA-DAIICHI-6	Japan
Site-?kuma-machi	Nuclear Power Reactor	FUKUSHIMA-DAIICHI-3	Japan
Site-?kuma-machi	Nuclear Power Reactor	FUKUSHIMA-DAIICHI-5	Japan
Site-Onagawa	Nuclear Power Reactor	Onagawa-2	Japan
Site-Onagawa	Nuclear Power Reactor	Onagawa-3	Japan
Site-Onagawa	Nuclear Power Reactor	Onagawa-1	Japan

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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

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.

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