This alert expired on 25 June 2026 at 21:30 UTC. It is kept here as a record.
It is the 4th strongest of the 16 detections recorded within 20 km of this point since 15 March 2026. The last comparable one was on 18 May 2026.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued June 25 at 5:01PM EDT until June 25 at 5:30PM EDT by NWS Detroit/Pontiac MI
An estimated 223,869 people live within 50 km of this point.
Nearby, since 15 March 2026
- July 18, 2026 · score 43 · 13.6 km
- July 18, 2026 · score 48 · 14.9 km
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 43 out of 100, at 86 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Event Data
| Type | Severe weather |
| Severity | medium |
| Calamity Score (ours) | 43 / 100 |
| Our confidence | 86% |
| Coordinates | 43.1140, -83.1060 |
| Nearest City | Burton (44 km) |
| Population Exposed | 223.9K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-25T21:01:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.7eab4de3959664ce9c6beb93c2937141eeb2f878.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Lapeer, MI |
| Headline | Severe Thunderstorm Warning issued June 25 at 5:01PM EDT until June 25 at 5:30PM EDT by NWS Detroit/Pontiac MI |
| Expires | 2026-06-25T17:30:00-04:00 |
| SenderName | NWS Detroit/Pontiac MI |
| HasExactCoords | true |
| Iem TypeSummary | H |
| Iem Magnitude | 0.5 |
| Iem Unit | inch |
| Iem City | 1 W Keewahdin |
| Iem County | St. Clair |
| Iem State | MI |
| Iem Wfo | DTX |
| MergedSources | [{"id":"iem_H_42.950_-82.560_1782415140000","source":"iem","severity":"low","severityValue":25,"timestamp":1782415140000,"latitude":42.95,"longitude":-82.56},{"id":"iem_H_43.040_-82.460_1782416100000","source":"iem","severity":"low","severityValue":25,"timestamp":1782416100000,"latitude":43.04,"longitude":-82.46}] |
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 10 February 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.
Calamity.live data shows a weather event with CalamityScore 43/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.