This alert expired on 3 September 2026 at 03:45 UTC. It is kept here as a record.
It is the strongest of the 40 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 2 at 10:38PM EDT until September 2 at 11:45PM EDT by NWS Detroit/Pontiac MI
An estimated 1,470,516 people live within 50 km of this point.
Nearby, since 4 April 2026
- May 18, 2026 · score 52 · 8.0 km
- September 3, 2026 · score 46 · 10.2 km
- May 19, 2026 · score 52 · 13.1 km
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 58 out of 100, at 91 % 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 | High |
| Calamity Score (ours) | 58 / 100 |
| Our confidence | 91% |
| Coordinates | 42.6186, -83.6943 |
| Nearest City | Novi (23 km) |
| Population Exposed | 1.5M within 50 km |
| Impact Tier | severe |
| Timestamp | 2026-09-03T02:38:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.eb1104a496506cbb683103101049a9722cbc4a07.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Livingston, MI; Oakland, MI |
| Headline | Severe Thunderstorm Warning issued September 2 at 10:38PM EDT until September 2 at 11:45PM EDT by NWS Detroit/Pontiac MI |
| Expires | 2026-09-02T23:45:00-04:00 |
| SenderName | NWS Detroit/Pontiac MI |
| HasExactCoords | true |
| Spc ReportType | hail |
| Spc Speed | 100 |
| Spc Location | Otter Lake |
| Spc County | Lapeer |
| Spc State | MI |
| Spc Comments | Reported along 6600 block of Hart Lake Rd. (DTX) |
| Iem TypeSummary | H |
| Iem Magnitude | 1 |
| Iem Unit | Inch |
| Iem City | Williamston |
| Iem County | Ingham |
| Iem State | MI |
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 Novi?
Calamity.live data shows a weather event with CalamityScore 58/100, near Novi (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.