This alert expired on 4 September 2026 at 13:00 UTC. It is kept here as a record.
It is the 23rd strongest of the 51 detections recorded within 20 km of this point since 26 March 2026. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Special Marine Warning issued September 4 at 7:35AM EDT until September 4 at 9:00AM EDT by NWS Cleveland OH
An estimated 368,764 people live within 50 km of this point.
Nearby, since 26 March 2026
- May 9, 2026 · score 43 · 3.4 km
- August 11, 2026 · score 43 · 4.3 km
- August 10, 2026 · score 43 · 5.5 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 37 out of 100, at 86 % 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) | 37 / 100 |
| Our confidence | 86% |
| Coordinates | 41.6371, -83.1114 |
| Nearest City | Oregon (31 km) |
| Population Exposed | 368.8K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-04T11:35:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.0dfb0068cd068a159915dd183112474156052a63.001.1 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Maumee Bay to Reno Beach OH; Reno Beach to The Islands OH; Detroit River Lt. to Maumee Bay OH to Reno Beach OH beyond 5NM offshoreline to US-Canadian border; Reno Beach to The Islands OH beyond 5NM off shoreline to US-Canadian border |
| Headline | Special Marine Warning issued September 4 at 7:35AM EDT until September 4 at 9:00AM EDT by NWS Cleveland OH |
| Expires | 2026-09-04T09:00:00-04:00 |
| SenderName | NWS Cleveland OH |
| HasExactCoords | true |
| Iem TypeSummary | E |
| Iem City | 2 SSW Toledo |
| Iem County | Lucas |
| Iem State | OH |
| Iem Wfo | CLE |
| Iem Remark | High water on Airport Highway and South Avenue. Water was over the road and sidewalk. |
| MergedSources | [{"id":"iem_E_41.630_-83.600_1788519600000","source":"iem","severity":"low","severityValue":25,"timestamp":1788519600000,"latitude":41.63,"longitude":-83.6}] |
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 in this area?
Calamity.live data shows a weather event with CalamityScore 37/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.