This alert expired on 19 May 2026 at 21:45 UTC. It is kept here as a record.
It is the 2nd strongest of the 103 detections recorded within 20 km of this point since 16 March 2026. The last comparable one was on 18 May 2026. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 19 at 5:32PM EDT until May 19 at 5:45PM EDT by NWS Detroit/Pontiac MI
An estimated 398,157 people live within 50 km of this point.
Nearby, since 16 March 2026
- September 4, 2026 · score 37 · 4.0 km
- September 3, 2026 · score 37 · 4.0 km
- July 3, 2026 · score 43 · 9.3 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 | 41.6373, -83.7123 |
| Nearest City | Sylvania (9 km) |
| Population Exposed | 398.2K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-19T21:32:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.8dae23d4bf60ff196fe1d95319da3b8b |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Monroe, MI; Fulton, OH; Henry, OH |
| Headline | Severe Thunderstorm Warning issued May 19 at 5:32PM EDT until May 19 at 5:45PM EDT by NWS Detroit/Pontiac MI |
| Expires | 2026-05-19T17:45:00-04:00 |
| SenderName | NWS Detroit/Pontiac MI |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.8dae23d4bf60ff196fe1d95319da3b8bfa1c304e.002.1","noaa_urn:oid:2.49.0.1.840.0.d7755099893ee350521d199179c007e2a20bd4dd.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 Sylvania?
Calamity.live data shows a weather event with CalamityScore 43/100, near Sylvania (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.