This alert expired on 9 May 2026 at 23:19 UTC. It is kept here as a record.
No stronger detection stands among the 10 recorded within 20 km of this point since 9 May 2026 — 3 others scored the same.
What the source measured
NOAA reported: Special Marine Warning issued May 9 at 7:09PM EDT until May 9 at 7:15PM EDT by NWS Cleveland OH
An estimated 1,020,861 people live within 50 km of this point.
Nearby, since 9 May 2026
- June 17, 2026 · score 46 · 18.1 km
- August 3, 2026 · score 52 · 18.9 km
- June 26, 2026 · score 48 · 20.3 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 52 out of 100, at 79 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v1. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 52 / 100 |
| Our confidence | 79% |
| Coordinates | 42.7980, -79.2490 |
| Nearest City | Port Colborne (11 km) |
| Population Exposed | 1.0M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-09T23:09:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.a0380b3d9b4d1041f1d3c6836ac80809 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Conneaut OH to Ripley NY; Conneaut OH to Ripley NY beyond 5 nm off shoreline to US-Canadian border; Upper Niagara River and Buffalo Harbor; Ripley to Dunkirk NY; Dunkirk to Buffalo NY; Ripley to Buffalo NY extending from 5NM off shoreline to US-Canadian border; Lower Niagara River; Niagara River to Hamlin Beach NY; Niagara River to Hamlin Beach NY beyond 5NM off shoreline to US-Canadian border |
| Headline | Special Marine Warning issued May 9 at 7:09PM EDT until May 9 at 7:15PM EDT by NWS Cleveland OH |
| Expires | 2026-05-09T19:19:00-04:00 |
| SenderName | NWS Cleveland OH |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.a0380b3d9b4d1041f1d3c6836ac80809fe115eca.001.1","noaa_urn:oid:2.49.0.1.840.0.2cc5d79153b1a0ef0e147869a13a2ebaf2cc9167.001.1","noaa_urn:oid:2.49.0.1.840.0.37f7cfe1b981dbe79aff0d5aee9175259218c0f1.001.1"] |
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 52/100, near Port Colborne (Canada), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.