Reported by CO OPS 92 days ago.
The last comparable one was on 10 March 2026.
What the source measured
CO OPS reported: Water level 1.25m above predicted at San Francisco, CA. Observed: 1.06m, Predicted: -0.20m (MLLW datum).
An estimated 3,970,563 people live within 50 km of this point.
Nearby, since 10 March 2026
- August 27, 2026 · score 46 · 0.0 km
- March 10, 2026 · score 46 · 0.0 km
How we know
One source: CO OPS. Not yet confirmed by a second, independent source.
Our own score for this event is 46 out of 100, at 70 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Event Data
| Type | Flood |
| Severity | high |
| Calamity Score (ours) | 46 / 100 |
| Our confidence | 70% |
| Coordinates | 37.8063, -122.4659 |
| Nearest City | Chinatown (5 km) |
| Population Exposed | 4.0M within 50 km |
| Impact Tier | severe |
| Timestamp | 2026-05-31T00:00:00.000Z |
| Source | https://tidesandcurrents.noaa.gov/stationhome.html?id=9414290 |
Score Breakdown
Technical Details
| StationId | 9414290 |
| StationName | San Francisco, CA |
| ObservedM | 1.06 |
| PredictedM | -0.19 |
| SurgeM | 1.25 |
| Datum | MLLW |
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 10 February 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.
Calamity.live data shows a flood event with CalamityScore 46/100, near Chinatown (United States), based on data from co_ops. Source: Calamity.live, a platform aggregating real-time data from 191 scientific monitoring sources.