What is the location of the flooding?
As of June 3, 2026, Tropical Storm Jangmi has dumped heavy rain across central and eastern Japan, moving into the heavily populated Tokyo region. The storm initially made landfall in Wakayama prefecture in central Japan at typhoon strength before weakening significantly.
Authorities issued the highest-level flood warnings for multiple areas across central and eastern Japan as torrential rainfall continues. The storm affected regions from Okinawa in the south to Tokyo and surrounding areas in the north, with the Owase area recording 50 centimeters of rain in 24 hours (1).
Wind map of Japan, as of June 3, 2026. Source: IQAir.
Which cities or areas are affected by the flooding?
Flooding and severe weather impacts have affected several regions across central and eastern Japan, including:
What is the current containment status of the flooding?
Managing the flooding remains challenging as heavy rainfall continues across affected regions. Rescue operations are ongoing, with Japanese authorities monitoring river levels and issuing updated weather advisories.
Tropical Storm Jangmi was moving northeast with maximum sustained winds of 90 kph (55 mph) as of Wednesday morning. Heavy rain paralyzes street traffic, suspended train services, and knocked out power to more than 5,000 homes in the Tokyo region (2).
Are there any evacuation orders or alerts in place?
Japan has issued highest-level flood warnings across central and eastern regions, urging residents to move to higher ground for safety. Authorities urged approximately 370,000 people across swaths of the country from Shikoku island in western Japan to Tokyo to evacuate.
Residents near rivers and in vulnerable mountainous areas were strongly advised to take shelter. Schools in Tokyo and surrounding areas have closed, while train services remain suspended or delayed. Authorities continue monitoring conditions and rolling updates as rainfall persists through June 4.
How can I protect myself from mold after flooding?
It’s important to take steps to prevent mold after a flood.
- Before entering a flooded area, make sure it is safe and free from electrical hazards or structural damage.
- Use protective gear: wear gloves, goggles, and a KN95/FFP2 mask to minimize exposure to mold spores.
- If there is still standing water, remove it as quickly as possible. Use pumps, wet-dry vacuums, or buckets to extract the water.
- Open windows and doors to facilitate air circulation and use fans, dehumidifiers, and HVAC systems to help dry the space. This step is crucial within the first 24-48 hours after flooding to prevent mold growth.
- Remove and discard any items that have been severely damaged by floodwater and cannot be thoroughly cleaned and dried. This includes carpets, upholstered furniture, mattresses, and any other porous materials.
- Thoroughly clean all hard surfaces with a detergent or cleaner suitable for mold remediation. Use a solution of 1.5 cups of bleach mixed with one gallon of water to disinfect nonporous surfaces. Never mix bleach with ammonia or other cleaning products, as the fumes are toxic.
- Maintain an indoor relative humidity (RH) of 35-50%. High humidity promotes mold growth, so consider using dehumidifiers in damp areas.
- Run a high-performance air purifier for mold, both during and after the mold removal work.
- If the flooding and mold damage are extensive, consider contacting professionals specializing in mold remediation to ensure proper cleanup and restoration.
Remember, mold can pose health risks, so it's important to take these steps promptly and thoroughly. If you experience persistent mold-related health issues or have concerns about extensive mold growth, consult with a medical professional or a mold remediation specialist.
