This alert expired on 3 September 2026 at 17:15 UTC. It is kept here as a record.
It is the 29th strongest of the 110 detections recorded within 20 km of this point since 4 April 2026. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued September 3 at 12:12PM EDT until September 3 at 1:15PM EDT by NWS Detroit/Pontiac MI
An estimated 2,977,248 people live within 50 km of this point.
Nearby, since 4 April 2026
- September 3, 2026 · score 46 · 0.0 km
- May 18, 2026 · score 52 · 5.4 km
- May 19, 2026 · score 52 · 7.6 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 46 out of 100, at 81 % 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) | 46 / 100 |
| Our confidence | 81% |
| Coordinates | 42.6153, -83.0059 |
| Nearest City | Sterling Heights (4 km) |
| Population Exposed | 3.0M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-03T16:12:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.436e895f2d38329ec5bd7a8c34689abbd4938a92.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Oakland, MI; Macomb, MI; St. Clair, MI |
| Headline | Severe Thunderstorm Warning issued September 3 at 12:12PM EDT until September 3 at 1:15PM EDT by NWS Detroit/Pontiac MI |
| Expires | 2026-09-03T13:15:00-04:00 |
| SenderName | NWS Detroit/Pontiac MI |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.436e895f2d38329ec5bd7a8c34689abbd4938a92.001.1","noaa_urn:oid:2.49.0.1.840.0.b20fbd2d3b539f2d70962621667584cbc1761406.001.1"] |
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 Sterling Heights?
Calamity.live data shows a weather event with CalamityScore 46/100, near Sterling Heights (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.