Right now
The most recent data we hold from NOAA arrived 6 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
Nothing else has been detected within 20 km in the last 24 hours.
This alert expired on 18 May 2026 at 23:45 UTC. It is kept here as a record.
It is the 4th strongest of the 83 detections recorded within 20 km of this point since 31 March 2026. Another comparable one was recorded here earlier the same day. 6 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued May 18 at 6:55PM EDT until May 18 at 7:45PM EDT by NWS Cleveland OH
An estimated 253,665 people live within 50 km of this point.
Nearby, since 31 March 2026
- May 19, 2026 · score 43 · 3.1 km
- July 21, 2026 · score 43 · 9.9 km
- June 6, 2026 · score 43 · 12.1 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 43 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) | 43 / 100 |
| Our confidence | 79% |
| Coordinates | 41.5367, -82.5522 |
| Nearest City | Sandusky (16 km) |
| Population Exposed | 253.7K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-18T22:55:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.e83fa31e9ae82cbd81253646da994aa075ef9a97.002.1 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | The Islands to Vermilion OH; Reno Beach to The Islands OH beyond 5NM off shoreline to US-Canadian border; The Islands to Vermilion OH beyond 5 nm off shoreline to US-Canadian border |
| Headline | Special Marine Warning issued May 18 at 6:55PM EDT until May 18 at 7:45PM EDT by NWS Cleveland OH |
| Expires | 2026-05-18T19:45:00-04:00 |
| SenderName | NWS Cleveland OH |
| HasExactCoords | true |
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.
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