This alert expired on 12 August 2026 at 23:00 UTC. It is kept here as a record.
It is the 2nd strongest of the 25 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 5:45PM CDT until August 12 at 6:00PM CDT by NWS St Louis MO
An estimated 59,289 people live within 50 km of this point.
Nearby, since 15 March 2026
- August 12, 2026 · score 39 · 10.3 km
- July 3, 2026 · score 39 · 12.3 km
- August 12, 2026 · score 39 · 16.5 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 39 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) | 39 / 100 |
| Our confidence | 77% |
| Coordinates | 37.9660, -88.9310 |
| Nearest City | Marion (26 km) |
| Population Exposed | 59.3K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-12T22:45:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.1aa10d69a24f7078fe50757477bf0495 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Franklin, MO; Crawford, MO; Jefferson, MO; Washington, MO; Dent, MO; Phelps, MO and 4 more areas |
| Headline | Severe Thunderstorm Warning issued August 12 at 5:45PM 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 | 7 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.1aa10d69a24f7078fe50757477bf0495f035cf17.001.1","noaa_urn:oid:2.49.0.1.840.0.ffdf77ebf86e1830ceed40ff8e9f8f2564c1130b.001.1","noaa_urn:oid:2.49.0.1.840.0.259fca7b331863646eba4edc15ff0ec2cb713110.001.1","noaa_urn:oid:2.49.0.1.840.0.c24f8089be6fb4fba1db225da20df7686d5d42e3.002.1","noaa_urn:oid:2.49.0.1.840.0.32858b1e81a9e87a3638590457b10b8dad35d5ff.001.1","noaa_urn:oid:2.49.0.1.840.0.f6c072825a84730b78295fcd47524fbed0e8282a.001.1","noaa_urn:oid:2.49.0.1.840.0.6c228373c013ccb07d7f3edff8d3e2c42a0a8814.002.1"] |
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 near Marion?
Calamity.live data shows a weather event with CalamityScore 39/100, near Marion (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.