Right now
The most recent data we hold from NOAA arrived 15 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
Nothing else has been detected within 20 km in the last 24 hours.
This alert expired on 18 May 2026 at 12:00 UTC. It is kept here as a record.
It is the 27th strongest of the 113 detections recorded within 20 km of this point since 16 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 May 18 at 6:28AM CDT until May 18 at 7:00AM CDT by NWS St Louis MO
Nearby, since 16 March 2026
- June 17, 2026 · score 22 · 8.0 km
- June 18, 2026 · score 43 · 13.5 km
- June 17, 2026 · score 43 · 14.4 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 22 out of 100, at 60 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v1. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 22 / 100 |
| Our confidence | 60% |
| Coordinates | 39.1783, -91.6900 |
| Nearest City | Columbia (61 km) |
| Impact Tier | minor |
| Date | 2026-05-18 — time not reported by the source |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.40ab5b4e9c396171354f24ac2bd7d016 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Adams, IL; Pike, IL; Marion, MO; Pike, MO; Ralls, MO; Audrain, MO; Boone, MO; Callaway, MO |
| Headline | Severe Thunderstorm Warning issued May 18 at 6:28AM CDT until May 18 at 7:00AM CDT by NWS St Louis MO |
| Expires | 2026-05-18T07:00:00-05:00 |
| SenderName | NWS St Louis MO |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.40ab5b4e9c396171354f24ac2bd7d01694316856.002.1","noaa_urn:oid:2.49.0.1.840.0.6ce3c935091c22016ad0c0b772379200dcde4c93.001.1"] |
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 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.
Want to know when something happens in this area?
Calamity.live data shows a weather event with CalamityScore 22/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.