This alert expired on 2 September 2026 at 12:15 UTC. It is kept here as a record.
It is the 5th strongest of the 10 detections recorded within 20 km of this point since 9 May 2026. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Special Marine Warning issued September 2 at 6:46AM EDT until September 2 at 8:15AM EDT by NWS Buffalo NY
An estimated 1,090,600 people live within 50 km of this point.
Nearby, since 9 May 2026
- May 9, 2026 · score 52 · 9.8 km
- July 21, 2026 · score 52 · 16.7 km
- June 17, 2026 · score 46 · 17.6 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 46 out of 100, at 81 % 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 | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 46 / 100 |
| Our confidence | 81% |
| Coordinates | 42.8859, -79.2381 |
| Nearest City | Port Colborne (2 km) |
| Population Exposed | 1.1M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-02T10:46:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.a8dd986125068da6c7d43a12105b7650a9f41ccb.001.1 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Lower Niagara River; Niagara River to Hamlin Beach NY; Niagara River to Hamlin Beach NY beyond 5NM off shoreline to US-Canadian border; Niagara River to Hamlin Beach NY; Niagara River to Hamlin Beach NY beyond 5NM off shoreline to US-Canadian border; Ripley to Dunkirk NY; Dunkirk to Buffalo NY; Ripley to Buffalo NY extending from 5NM off shoreline to US-Canadian border and 1 more areas |
| Headline | Special Marine Warning issued September 2 at 6:46AM EDT until September 2 at 8:15AM EDT by NWS Buffalo NY |
| Expires | 2026-09-02T08:15:00-04:00 |
| SenderName | NWS Buffalo NY |
| HasExactCoords | true |
| MergedCount | 4 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.a8dd986125068da6c7d43a12105b7650a9f41ccb.001.1","noaa_urn:oid:2.49.0.1.840.0.2a7afd740fae04dc3add0c85d3960d3ee476b8b4.001.1","noaa_urn:oid:2.49.0.1.840.0.e4bfaf938a1f1cf2b213cbcea81e44d6cfaf301f.001.1","noaa_urn:oid:2.49.0.1.840.0.b55d2326462e59493a965571e883b316e10caf0e.001.1"] |
Safety Information
Always follow official guidance from your local emergency management agency. This platform provides scientific monitoring data and is not a substitute for official warnings. If you are in immediate danger, contact your local emergency number.
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 near Port Colborne?
Calamity.live data shows a weather event with CalamityScore 46/100, near Port Colborne (Canada), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.