This alert expired on 11 July 2026 at 01:45 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. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 10 at 8:32PM CDT until July 10 at 8:45PM CDT by NWS St Louis MO
An estimated 1,055,658 people live within 50 km of this point.
Nearby, since 15 March 2026
- March 15, 2026 · score 48 · 3.3 km
- March 15, 2026 · score 72 · 6.3 km
- May 21, 2026 · score 48 · 6.5 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 52 out of 100, at 81 % 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) | 52 / 100 |
| Our confidence | 81% |
| Coordinates | 38.9993, -90.5042 |
| Nearest City | Saint Charles (24 km) |
| Population Exposed | 1.1M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-11T01:32:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.964830555dd659c64e090618e472b252 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Calhoun, IL; St. Charles, MO; St. Louis, MO; Greene, IL; Jersey, IL |
| Headline | Severe Thunderstorm Warning issued July 10 at 8:32PM CDT until July 10 at 8:45PM CDT by NWS St Louis MO |
| Expires | 2026-07-10T20:45:00-05:00 |
| SenderName | NWS St Louis MO |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.964830555dd659c64e090618e472b25275d19047.001.1","noaa_urn:oid:2.49.0.1.840.0.db1e04aa7265cd3fc957d92d1dab1429cea66611.001.1"] |
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 52/100, near Saint Charles (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.