This alert expired on 3 September 2026 at 03:45 UTC. It is kept here as a record.
It is the strongest of the 26 detections recorded within 20 km of this point since 4 April 2026. The last comparable one was on 16 July 2026.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued September 2 at 10:26PM EDT until September 2 at 11:45PM EDT by NWS Detroit/Pontiac MI
An estimated 556,351 people live within 50 km of this point.
Nearby, since 4 April 2026
- June 10, 2026 · score 37 · 11.9 km
- May 18, 2026 · score 52 · 18.3 km
- July 16, 2026 · score 43 · 19.2 km
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 54 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) | 54 / 100 |
| Our confidence | 91% |
| Coordinates | 42.6443, -83.9553 |
| Nearest City | Haslett (38 km) |
| Population Exposed | 556.4K within 50 km |
| Impact Tier | severe |
| Timestamp | 2026-09-03T02:26:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.963b2c74c158196d596a0544901f876a424c9dd2.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Livingston, MI; Oakland, MI; Ingham, MI |
| Headline | Severe Thunderstorm Warning issued September 2 at 10:26PM 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 |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.963b2c74c158196d596a0544901f876a424c9dd2.001.1","noaa_urn:oid:2.49.0.1.840.0.87d87e5793b601db47140aa20fd58c302a5829a3.001.1"] |
| 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 | 2 |
| Iem Unit | inch |
| Iem City | Birch Run |
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 in this area?
Calamity.live data shows a weather event with CalamityScore 54/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.