This alert expired on 3 September 2026 at 20:15 UTC. It is kept here as a record.
No stronger detection stands among the 59 recorded within 20 km of this point since 15 April 2026 — one other scored the same. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Tornado Warning issued September 3 at 3:36PM EDT until September 3 at 4:15PM EDT by NWS Detroit/Pontiac MI
An estimated 1,633,901 people live within 50 km of this point.
Nearby, since 15 April 2026
- July 3, 2026 · score 52 · 9.5 km
- September 3, 2026 · score 76 · 10.7 km
- September 4, 2026 · score 46 · 11.5 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 76 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 | Critical |
| Calamity Score (ours) | 76 / 100 |
| Our confidence | 86% |
| Coordinates | 42.4655, -83.6890 |
| Nearest City | Novi (17 km) |
| Population Exposed | 1.6M within 50 km |
| Impact Tier | catastrophic |
| Timestamp | 2026-09-03T19:36:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.9df879fcbd96803471f510e1866d8b1587086dd5.001.1 |
Score Breakdown
Technical Details
| Event | Tornado Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Oakland, MI; Washtenaw, MI; Livingston, MI |
| Headline | Tornado Warning issued September 3 at 3:36PM EDT until September 3 at 4:15PM EDT by NWS Detroit/Pontiac MI |
| Expires | 2026-09-03T16:15:00-04:00 |
| SenderName | NWS Detroit/Pontiac MI |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.9df879fcbd96803471f510e1866d8b1587086dd5.001.1","noaa_urn:oid:2.49.0.1.840.0.822595e75c4012a07b479764782671adebfa3e00.001.1","noaa_urn:oid:2.49.0.1.840.0.845e32fcfb1cb7f819c4a90a436fe023d7e92ce1.001.1"] |
| Spc ReportType | wind |
| Spc Speed | UNK |
| Spc Location | 1 SE Lansing |
| Spc County | Ingham |
| Spc State | MI |
| Spc Comments | Healthy 6 inch diameter tree down on road. Time approximate. (GRR) |
| MergedSources | [{"id":"spc_wind_42.70_-84.54_29","source":"spc","severity":"medium","severityValue":45,"timestamp":1788461100000,"latitude":42.7,"longitude":-84.54}] |
Safety Information
If a tornado warning is issued: go to a basement or an interior room on the lowest floor, away from windows. A vehicle and a mobile home are not shelter. Cover your head and neck. Wait for the official all-clear before going outside, and watch for downed power lines and gas leaks afterwards.
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 76/100, near Novi (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.