This alert expired on 3 September 2026 at 20:45 UTC. It is kept here as a record.
No stronger detection stands among the 61 recorded within 20 km of this point since 15 April 2026 — 5 others 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 4:16PM EDT until September 3 at 4:45PM EDT by NWS Detroit/Pontiac MI
An estimated 3,102,608 people live within 50 km of this point.
Nearby, since 15 April 2026
- September 3, 2026 · score 46 · 1.9 km
- June 9, 2026 · score 76 · 2.8 km
- June 9, 2026 · score 76 · 5.3 km
How we know
Confirmed by 4 independent sources, including NOAA.
Our own score for this event is 76 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 | Critical |
| Calamity Score (ours) | 76 / 100 |
| Our confidence | 91% |
| Coordinates | 42.2463, -83.1169 |
| Nearest City | LaSalle (5 km) |
| Population Exposed | 3.1M within 50 km |
| Impact Tier | catastrophic |
| Timestamp | 2026-09-03T20:16:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.eaf00bbfbf2072977616fdc61d95564a46c437a0.001.1 |
Score Breakdown
Technical Details
| Event | Tornado Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Macomb, MI; Monroe, MI; Wayne, MI |
| Headline | Tornado Warning issued September 3 at 4:16PM EDT until September 3 at 4:45PM EDT by NWS Detroit/Pontiac MI |
| Expires | 2026-09-03T16:45:00-04:00 |
| SenderName | NWS Detroit/Pontiac MI |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.eaf00bbfbf2072977616fdc61d95564a46c437a0.001.1","noaa_urn:oid:2.49.0.1.840.0.7596e7a899d3e7527125bb89b34d6b2d77d14d71.001.1","noaa_urn:oid:2.49.0.1.840.0.733e750476d74d766c62519aac652c0c9f77eb88.001.1"] |
| Spc ReportType | wind |
| Spc Speed | UNK |
| Spc Location | 2 E Highland |
| Spc County | Oakland |
| Spc State | MI |
| Spc Comments | Multiple trees down on Duck Lake Rd. (DTX) |
| Iem TypeSummary | D |
| Iem City | 3 W Lake Orion |
| Iem County | Oakland |
| Iem State | MI |
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 LaSalle?
Calamity.live data shows a weather event with CalamityScore 76/100, near LaSalle (Canada), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.