This alert expired on 11 August 2026 at 21:15 UTC. It is kept here as a record.
No stronger detection stands among the 41 recorded within 20 km of this point since 26 March 2026 — 18 others scored the same. Another comparable one was recorded here earlier the same day. 7 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued August 11 at 3:45PM EDT until August 11 at 5:15PM 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 · 1.5 km
- July 7, 2026 · score 43 · 2.8 km
- July 6, 2026 · score 43 · 2.8 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 80 % 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 | 80% |
| Coordinates | 41.6050, -83.0825 |
| Nearest City | Fremont (29 km) |
| Population Exposed | 368.8K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-11T19:45:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.c7083dbcca6f0d128246a7b930d8d14ff23b7cc3.001.1 |
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; The Islands to Vermilion 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 August 11 at 3:45PM EDT until August 11 at 5:15PM EDT by NWS Cleveland OH |
| Expires | 2026-08-11T17:15:00-04:00 |
| 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.
Want to know when something happens near Fremont?
Calamity.live data shows a weather event with CalamityScore 43/100, near Fremont (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.