Reported by CO OPS today.
It is the 594th strongest of the 960 detections recorded within 20 km of this point since 10 March 2026. Another comparable one was recorded here earlier the same day.
What the source measured
CO OPS reported: Water level 0.49m above predicted at Boston, MA. Observed: 0.99m, Predicted: 0.50m (MLLW datum).
The observed water level was 0.99 m, against 0.50 m predicted.
Nearby, since 10 March 2026
- September 4, 2026 · score 52 · 0.0 km
- September 3, 2026 · score 52 · 0.0 km
- September 2, 2026 · score 39 · 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 9 out of 100, at 50 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v4. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Floods |
| Severity | Low |
| Calamity Score (ours) | 9 / 100 |
| Our confidence | 50% |
| Coordinates | 42.3539, -71.0503 |
| Timestamp | 2026-09-04T16:24:00.000Z |
| Source | https://tidesandcurrents.noaa.gov/stationhome.html?id=8443970 |
Score Breakdown
Technical Details
| StationId | 8443970 |
| StationName | Boston, MA |
| ObservedM | 0.99 |
| PredictedM | 0.5 |
| SurgeM | 0.49 |
| 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 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.
Want to know when something happens in this area?
Calamity.live data shows a flood event with CalamityScore 9/100 (United States), based on data from co_ops. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.