This alert expired on 12 August 2026 at 23:00 UTC. It is kept here as a record.
It is the 42nd strongest of the 60 detections recorded within 20 km of this point since 15 March 2026. Another comparable one was recorded here earlier the same day. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued August 12 at 5:19PM CDT until August 12 at 6:00PM CDT by NWS St Louis MO
An estimated 42,034 people live within 50 km of this point.
Nearby, since 15 March 2026
- July 11, 2026 · score 48 · 22.0 km
- March 15, 2026 · score 63 · 24.5 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 34 out of 100, at 77 % 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) | 34 / 100 |
| Our confidence | 77% |
| Coordinates | 38.1183, -89.7940 |
| Nearest City | Belleville (48 km) |
| Population Exposed | 42.0K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-12T22:19:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.288abbfc342b8f7d78384742717910a4 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Franklin, MO; Franklin, IL; Hamilton, IL; Jefferson, IL; Franklin, MO; Gasconade, MO and 5 more areas |
| Headline | Severe Thunderstorm Warning issued August 12 at 5:19PM CDT until August 12 at 6:00PM CDT by NWS St Louis MO |
| Expires | 2026-08-12T18:00:00-05:00 |
| SenderName | NWS St Louis MO |
| HasExactCoords | true |
| MergedCount | 9 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.288abbfc342b8f7d78384742717910a47171de43.001.1","noaa_urn:oid:2.49.0.1.840.0.ccb360b4164df7a62f1bf6da15756c34ec9f5308.001.1","noaa_urn:oid:2.49.0.1.840.0.d1bcd8d475967427bd9588ce27cf286d2a8e1ad7.001.1","noaa_urn:oid:2.49.0.1.840.0.4c7ceb2f71d6e96993b7679f0ed9941a05c13ae0.002.1","noaa_urn:oid:2.49.0.1.840.0.6cdf36bbcc9ee2f28e9f31b53f3d8635ef2dc9cf.001.1","noaa_urn:oid:2.49.0.1.840.0.2fa41c4beffb99882e0c0ab555fb02e61828f008.001.1","noaa_urn:oid:2.49.0.1.840.0.f6049b3dd4d8e99a55b7b725613990a294ec3178.001.1","noaa_urn:oid:2.49.0.1.840.0.11a1a0b0e29a664bbfd5f879a459e70aee13c004.001.1","noaa_urn:oid:2.49.0.1.840.0.81183a568d5bc8230240c1bf9d911188a4e12537.001.1"] |
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.
Calamity.live data shows a weather event with CalamityScore 34/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.