Right now
The most recent data we hold from NOAA arrived 7 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
4 other detections within 20 km in the last 24 hours, the nearest <1 km from here.
This alert expired on 16 September 2026 at 03:45 UTC. It is kept here as a record.
It is the 8th strongest of the 18 detections recorded within 20 km of this point since 15 April 2026. Another comparable one was recorded here earlier the same day. 4 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued September 15 at 10:31PM EDT until September 15 at 11:45PM EDT by NWS Detroit/Pontiac MI
Urban PEI: 72,789 within a heuristic 50 km radius; not unique people.
Nearby, since 15 April 2026
- September 5, 2026 · score 28 · 21.0 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 32 out of 100.
This is our versioned heuristic index, not source severity or a calibrated probability. Urban PEI does not count unique people.
Computed under scoring rules v5. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 32 / 100 |
| Legacy data-support index | 0.81/1 |
| Coordinates | 41.8617, -84.2603 |
| Nearest City | Adrian (19 km) |
| Urban exposure index (PEI) | 72.8K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-16T02:31:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.8456bbacae31a24aeedcb92754b803b3a757681a.001.1 |
Physical priority index · v5. Heuristic priority, not calibrated probability, predictive accuracy or damage. The legacy data-support index combines assigned source support and field availability. Urban PEI is distance-weighted and does not count unique people; zero does not establish that nobody is present. Model cards.
Source and revision timeline
Source: noaa. Occurrence: 2026-09-16T02:31:00.000Z.
First archived: 2026-09-16T02:35:20.328Z. Material modification: not recorded.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Lenawee, MI; Hillsdale, MI |
| Headline | Severe Thunderstorm Warning issued September 15 at 10:31PM EDT until September 15 at 11:45PM EDT by NWS Detroit/Pontiac MI |
| Expires | 2026-09-15T23:45:00-04:00 |
| SenderName | NWS Detroit/Pontiac MI |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.8456bbacae31a24aeedcb92754b803b3a757681a.001.1","noaa_urn:oid:2.49.0.1.840.0.7756a011b4b85cbf563e2c9d0e8e75c86d13eba8.001.1"] |
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.
Review the area, threshold and delivery channel in your account.
Want to know when something happens near Adrian?