This alert expired on 3 September 2026 at 19:00 UTC. It is kept here as a record.
It is the 7th strongest of the 17 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 2:14PM EDT until September 3 at 3:00PM EDT by NWS Grand Rapids MI
An estimated 261,711 people live within 50 km of this point.
Nearby, since 4 April 2026
- September 3, 2026 · score 67 · 18.7 km
- June 9, 2026 · score 67 · 20.3 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 37 out of 100, at 86 % 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) | 37 / 100 |
| Our confidence | 86% |
| Coordinates | 43.1375, -84.2086 |
| Nearest City | Saginaw (38 km) |
| Population Exposed | 261.7K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-03T18:14:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.b7febc2858cf2b389299bba1a72d33f23d20fd4b.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Clinton, MI; Gratiot, MI; Shiawassee, MI; Genesee, MI and 1 more areas |
| Headline | Severe Thunderstorm Warning issued September 3 at 2:14PM EDT until September 3 at 3:00PM EDT by NWS Grand Rapids MI |
| Expires | 2026-09-03T15:00:00-04:00 |
| SenderName | NWS Grand Rapids MI |
| HasExactCoords | true |
| MergedCount | 4 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.b7febc2858cf2b389299bba1a72d33f23d20fd4b.001.1","noaa_urn:oid:2.49.0.1.840.0.589888b023e6a9758d92f95fef0351f8f017492f.001.1","noaa_urn:oid:2.49.0.1.840.0.cf36f65079351ea88cd8a5722bc794cc1cc0cda5.001.1","noaa_urn:oid:2.49.0.1.840.0.b1284ac31bf72f9ab982d2d170a619efb5ec0b05.001.1"] |
| Spc ReportType | wind |
| Spc Speed | UNK |
| Spc Location | 4 S Holly |
| Spc County | Oakland |
| Spc State | MI |
| Spc Comments | Large tree down. (DTX) |
| MergedSources | [{"id":"spc_wind_42.80_-83.62_11","source":"spc","severity":"medium","severityValue":45,"timestamp":1788447180000,"latitude":42.8,"longitude":-83.62},{"id":"spc_wind_42.74_-83.62_12","source":"spc","severity":"medium","severityValue":45,"timestamp":1788447480000,"latitude":42.74,"longitude":-83.62}] |
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 37/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.