Full Breakdown
Jangmi’s Landfall and Immediate Impacts Across Japan
6/4/2026, 8:56:13 AM
Core Event: Landfall and Flood Warnings
On 3 June 2026 at 04:30 JST, Severe Tropical Storm Jangmi made landfall in southern Wakayama Prefecture at typhoon strength (126 km/h) before weakening to sustained winds of 90 km/h. The Japan Meteorological Agency (JMA) issued a Level 5 Special Flood Warning—the highest tier of the five-level disaster-alert system—for the Koza River, the first such alert since the system’s introduction in May 2026. Simultaneously, Level 4 heavy-rain warnings were posted for multiple rivers in the Tokyo-Kanto region, including the Zenpukuji, Meguro, Kanda and Nogawa rivers.
Background: New Five-Level Disaster Alert System
Japan’s revised disaster-alert framework, launched in May 2026, classifies flood and rain threats into five levels, with Level 5 indicating imminent danger to life. Jangmi triggered the first Level 5 alert for the Koza River and several Level 4 alerts for Tokyo’s river systems, prompting mandatory evacuation orders in designated flood-prone zones.
Data & Statistics: Rainfall, Injuries, Power Outages, Evacuations, Transport Disruption
- Rainfall: 50 cm recorded in Owase within 24 h; 535.5 mm in Owase (peak), 376 mm in Kumano, 210.5 mm in Ise, and 173.5 mm in central Tokyo over 12 h. Forecasts called for up to 200 mm in Tokai-Kanto and 120 mm in Tohoku by 6 June.
- Injuries: Reported counts range from 9 to 23 across prefectures, with the highest number in Okinawa (17) and additional injuries in Kagoshima, Miyazaki, Tokushima, Nara and Aichi.
- Power outages: Estimates vary between 48 000 households (Okinawa/Kagoshima) and > 60 000 nationwide; Tokyo Electric Power Company reported over 5 000 homes without electricity in the capital region.
- Evacuations: Authorities ordered evacuation for 370 000 – 800 000 residents across Tokyo, Shikoku, Kyushu and other prefectures; the Cabinet Office later noted that 1.6 million people were placed under advisory.
- Transport: Flight cancellations totaled 600 – 880 flights (? 760 domestic, > 90 international). Rail services on JR East’s Shonan-Shinjuku, Chuo, Ome, Hachiko and other lines were suspended or delayed, with partial restoration by evening.
On-the-Ground Reports: Eyewitnesses and Local Impacts
Reporters in Kumano described wind “pushing against my body” and rain “blowing sideways” making vision difficult. Commuters in Tokyo noted umbrellas turning inside out repeatedly, and residents of Tsu City observed flooded streets and a collapsed section of National Route 260. In Kawasaki, a 30-cm water depth inundated a road intersection, while in Yokohama fallen trees blocked railway tracks.
Official Statements & Responses
Government spokesperson Minoru Kihara repeatedly urged residents to monitor municipal evacuation notices, heed JMA warnings, and act promptly to protect life. The JMA emphasized the “imminent danger to life” associated with Level 5 alerts and advised continuous vigilance for landslides and river flooding. Toyota, Suzuki and Sapporo Holdings temporarily halted production at multiple plants as a precaution.
Criticism & Opposition: Evacuation Behavior and Shelter Use
Disaster-reduction expert Takehiko Yamamura highlighted low shelter occupancy despite evacuation orders, warning that “if people ignore future danger alerts, they may fail to evacuate when a truly life-threatening situation occurs.” Observers noted that many residents remained at home, questioning the clarity of evacuation guidance.
Conflicting Reports & Gaps
Sources differ on injury tallies (9 – 23), power-outage figures (48 000 – > 60 000), evacuation counts (370 000 – 1.6 million) and flight cancellations (600 – 880). Precise damage assessments for infrastructure such as collapsed roads and flooded utilities remain incomplete.
Verbatim Quotes
- “If you sense any danger, please do not hesitate to take early action to protect your lives,” — Minoru Kihara, Government Spokesperson
- “The storm has flooded streets, toppled trees, triggered landslides and closed some expressways, Kihara said, adding "approximately 60,000" power outages have been confirmed.” — Minoru Kihara, Press Briefing
- “Strong winds are pushing against my body, and the rain is blowing sideways so hard that it's difficult to keep my eyes open,” — Field Reporter, Kumano
- “We really need it restored as quickly as possible," one resident said.” — Resident, Tsu City
- “Because there was no major flooding and relatively little damage, most people did not evacuate,” — Takehiko Yamamura, Disaster-Reduction Institute
- “One commuter said their umbrella had been turned inside out five times during the day.” — Commuter, Tokyo
What’s Next: Ongoing Risks and Recovery
The JMA projects continued heavy rain through 4 June, maintaining landslide and flood threats, especially on saturated slopes. Jangmi is expected to transition to an extratropical cyclone over the Pacific, but authorities warn that swollen rivers and unstable terrain may cause additional incidents. Restoration of power, water services and transport networks is slated for gradual resumption on 4 – 5 June, pending safety inspections.
