This alert expired on 3 September 2026 at 04:00 UTC. It is kept here as a record.
No stronger detection stands among the 48 recorded within 20 km of this point since 13 March 2026 — 3 others scored the same. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued September 2 at 11:05PM EDT until September 3 at 12:00AM EDT by NWS Detroit/Pontiac MI
An estimated 3,242,885 people live within 50 km of this point.
Nearby, since 13 March 2026
- May 19, 2026 · score 52 · 3.2 km
- September 3, 2026 · score 58 · 8.1 km
- March 13, 2026 · score 52 · 8.3 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 58 out of 100, at 87 % 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 | 87% |
| Coordinates | 42.4623, -83.2565 |
| Nearest City | Southfield (3 km) |
| Population Exposed | 3.2M within 50 km |
| Impact Tier | severe |
| Timestamp | 2026-09-03T03:05:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.e9bbb939292e53a4a8ddb5b9ef965260dbeba73b.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Washtenaw, MI; Wayne, MI; Livingston, MI; Oakland, MI; Macomb, MI |
| Headline | Severe Thunderstorm Warning issued September 2 at 11:05PM EDT until September 3 at 12:00AM EDT by NWS Detroit/Pontiac MI |
| Expires | 2026-09-03T00:00:00-04:00 |
| SenderName | NWS Detroit/Pontiac MI |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.e9bbb939292e53a4a8ddb5b9ef965260dbeba73b.001.1","noaa_urn:oid:2.49.0.1.840.0.2dbc96f7fdf652ce685ecef7ecad93102280e36b.001.1","noaa_urn:oid:2.49.0.1.840.0.8bee831b5325bc77994ccb65343d59ea21f07a2f.001.1"] |
| Spc ReportType | hail |
| Spc Speed | 200 |
| Spc Location | 1 NW Capac |
| Spc County | St. Clair |
| Spc State | MI |
| Spc Comments | (DTX) |
| MergedSources | [{"id":"spc_wind_42.61_-83.94_224","source":"spc","severity":"medium","severityValue":45,"timestamp":1788403020000,"latitude":42.61,"longitude":-83.94},{"id":"spc_wind_42.63_-83.98_225","source":"spc","severity":"medium","severityValue":45,"timestamp":1788403200000,"latitude":42.63,"longitude":-83.98},{"id":"spc_hail_43.02_-82.95_232","source":"spc","severity":"high","severityValue":65,"timestamp":1788406102307,"latitude":43.02,"longitude":-82.95}] |
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 Southfield?
Calamity.live data shows a weather event with CalamityScore 58/100, near Southfield (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.