This alert expired on 4 July 2026 at 01:45 UTC. It is kept here as a record.
It is the 2nd strongest of the 23 detections recorded within 20 km of this point since 18 March 2026. The last comparable one was on 26 June 2026. One more was recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued July 3 at 8:13PM EDT until July 3 at 9:45PM EDT by NWS Cleveland OH
An estimated 125,911 people live within 50 km of this point.
Nearby, since 18 March 2026
- September 3, 2026 · score 37 · 10.5 km
- July 21, 2026 · score 43 · 11.4 km
- August 2, 2026 · score 34 · 15.2 km
How we know
Confirmed by 5 independent sources, including NOAA.
Our own score for this event is 43 out of 100, at 90 % 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 | 90% |
| Coordinates | 41.9500, -81.0490 |
| Nearest City | Ashtabula (23 km) |
| Population Exposed | 125.9K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-04T00:13:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.05155c9131b26523140f1ed8b55cb351f1c4d2e3.001.1 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Willowick to Geneva-on-the Lake OH; Geneva-on-the-Lake to Conneaut OH; Willowick to Geneva-on-the-Lake OH beyond 5NM off shoreline to US-Canadian border; Geneva-on-the-Lake to Conneaut OH beyond 5 nm off shoreline to US-Canadian border |
| Headline | Special Marine Warning issued July 3 at 8:13PM EDT until July 3 at 9:45PM EDT by NWS Cleveland OH |
| Expires | 2026-07-03T21:45:00-04:00 |
| SenderName | NWS Cleveland OH |
| HasExactCoords | true |
| Iem TypeSummary | M |
| Iem Magnitude | 55 |
| Iem Unit | MPH |
| Iem City | 2 WSW Bratenahl |
| Iem County | LEZ146 |
| Iem State | OH |
| Iem Wfo | CLE |
| Iem Remark | Buoy station CNDO1 Cleveland, OH. |
| MergedSources | [{"id":"iem_M_41.760_-81.280_1783125000000","source":"iem","severity":"low","severityValue":25,"timestamp":1783125000000,"latitude":41.76,"longitude":-81.28},{"id":"iem_M_41.520_-81.680_1783124220000","source":"iem","severity":"low","severityValue":25,"timestamp":1783124220000,"latitude":41.52,"longitude":-81.68},{"id":"iem_D_41.570_-81.200_1783126620000","source":"iem","severity":"low","severityValue":25,"timestamp":1783126620000,"latitude":41.57,"longitude":-81.2},{"id":"iem_M_41.540_-81.640_1783124280000","source":"iem","severity":"low","severityValue":25,"timestamp":1783124280000,"latitude":41.54,"longitude":-81.64}] |
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 Ashtabula?
Calamity.live data shows a weather event with CalamityScore 43/100, near Ashtabula (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.