This alert expired on 12 August 2026 at 22:00 UTC. It is kept here as a record.
It is the 3rd strongest of the 29 detections recorded within 20 km of this point since 15 March 2026. Another comparable one was recorded here earlier the same day. 10 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued August 12 at 4:41PM CDT until August 12 at 5:00PM CDT by NWS St Louis MO
An estimated 341,025 people live within 50 km of this point.
Nearby, since 15 March 2026
- March 15, 2026 · score 67 · 5.0 km
- August 6, 2026 · score 43 · 7.7 km
- June 21, 2026 · score 48 · 12.2 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 43 out of 100, at 78 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Event Data
| Type | Severe weather |
| Severity | medium |
| Calamity Score (ours) | 43 / 100 |
| Our confidence | 78% |
| Coordinates | 38.3112, -90.7756 |
| Nearest City | Wildwood (32 km) |
| Population Exposed | 341.0K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-12T21:41:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.85831cf14027c045abd3f051c8941700 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Gasconade, MO; Montgomery, MO; Osage, MO; Randolph, IL |
| Headline | Severe Thunderstorm Warning issued August 12 at 4:41PM CDT until August 12 at 5:00PM CDT by NWS St Louis MO |
| Expires | 2026-08-12T17:00:00-05:00 |
| SenderName | NWS St Louis MO |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.85831cf14027c045abd3f051c89417009194504e.002.1","noaa_urn:oid:2.49.0.1.840.0.f64611feacdf9a53c15c3fc27b81d7466f6f49cb.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 10 February 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 43/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.