Right now
The most recent data we hold from GDACS arrived 15 minutes ago, and this point is in it.
Reported by GDACS today.
What the source measured
GDACS reported: On 20/09/2026, a flood started in Japan, lasting until 22/09/2026 (last update). The flood caused 0 deaths and 30 displaced . · Severity: Magnitude 0 · Pop. affected: 0 deaths and 30 displaced
Urban PEI: 32,653,306 within a heuristic 50 km radius; not unique people.
How we know
2 recorded sources include GDACS; independence is not established by this count.
Our own score for this event is 39 out of 100.
This is our versioned heuristic index, not source severity or a calibrated probability. Urban PEI does not count unique people.
Computed under scoring rules v5. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Floods |
| Severity | Medium |
| Calamity Score (ours) | 39 / 100 |
| Legacy data-support index | 0.79/1 |
| Coordinates | 35.6090, 140.1246 |
| Nearest City | Chiba (1 km) |
| Urban exposure index (PEI) | 32.7M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-22T07:37:25.605Z |
| Source | https://www.gdacs.org/report.aspx?eventtype=FL&eventid=1104182 |
Physical priority index · v5. Heuristic priority, not calibrated probability, predictive accuracy or damage. The legacy data-support index combines assigned source support and field availability. Urban PEI is distance-weighted and does not count unique people; zero does not establish that nobody is present. Model cards.
Source and revision timeline
Source: gdacs. Occurrence: 2026-09-22T07:37:25.605Z.
First archived: 2026-09-22T07:06:53.754Z. Material modification: 2026-09-22T07:39:20.831Z.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
2026-09-22T07:39:20.831Z · data_change
Index 39 → 39; severity medium → medium; version 5 → 5.
2026-09-22T07:33:56.025Z · data_change
Index 39 → 39; severity medium → medium; version 5 → 5.
Score Breakdown
Technical Details
| EventType | FL |
| AlertLevel | Green |
| Country | Japan |
| Population | 0 deaths and 30 displaced |
| FromRSS | true |
| Google News RssFeed | flood |
| Google News SourceName | businessupturn.com |
| MergedSources | [{"id":"gnews_flood_497217_43","source":"google_news","severity":"medium","severityValue":40,"timestamp":1789982340000,"latitude":35.28,"longitude":139.67},{"id":"gnews_flood_497233_47","source":"google_news","severity":"medium","severityValue":40,"timestamp":1790040559000,"latitude":35.69,"longitude":139.69},{"id":"gnews_flood_497221_61","source":"google_news","severity":"medium","severityValue":40,"timestamp":1789997520000,"latitude":35.69,"longitude":139.69},{"id":"gnews_flood_497217_72","source":"google_news","severity":"medium","severityValue":40,"timestamp":1789982089000,"latitude":35.6,"longitude":140.12}] |
Safety Information
During flooding: never walk, swim, or drive through floodwaters. Six inches of moving water can knock you down, and one foot of water can sweep away a vehicle. Move to higher ground if waters rise. After flooding, avoid contact with floodwater which may contain sewage, chemicals, or debris. Follow local emergency service guidance.
Series begins 8 March 2026. Comparisons refer to that period only. Collection gap: 14-26 August 2026.
This data is aggregated algorithmically from scientific sources. Not a replacement for official emergency warnings.
Review the area, threshold and delivery channel in your account.
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