Right now
The most recent data we hold from NOAA arrived 2 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
One other detection within 20 km in the last 24 hours, 5 km from here.
This alert expired on 10 September 2026 at 05:15 UTC. It is kept here as a record.
It is the 44th strongest of the 72 detections recorded within 20 km of this point since 15 March 2026. The last comparable one was on 6 August 2026.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued September 9 at 11:37PM CDT until September 10 at 12:15AM CDT by NWS St Louis MO
An estimated 1,306,164 people live within 50 km of this point.
Nearby, since 15 March 2026
- May 19, 2026 · score 52 · 1.7 km
- March 16, 2026 · score 52 · 3.4 km
- September 10, 2026 · score 46 · 4.6 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 46 out of 100, at 81 % 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) | 46 / 100 |
| Our confidence | 81% |
| Coordinates | 38.5150, -90.3543 |
| Nearest City | Concord (1 km) |
| Population Exposed | 1.3M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-10T04:37:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.77d5c330e425d93852f75637c724d70dc42bd067.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Monroe, IL; Jefferson, MO; St. Louis, MO; St. Louis City, MO |
| Headline | Severe Thunderstorm Warning issued September 9 at 11:37PM CDT until September 10 at 12:15AM CDT by NWS St Louis MO |
| Expires | 2026-09-10T00:15:00-05:00 |
| SenderName | NWS St Louis MO |
| HasExactCoords | true |
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.
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