This alert expired on 15 March 2026 at 22:53 UTC. It is kept here as a record.
It is the 9th strongest of the 37 detections recorded within 20 km of this point since 15 March 2026. Another comparable one was recorded here earlier the same day. 6 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued March 15 at 5:43PM CDT until March 15 at 5:45PM CDT by NWS St Louis MO
An estimated 18,181 people live within 50 km of this point.
Nearby, since 15 March 2026
- July 4, 2026 · score 34 · 19.8 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 34 out of 100, at 83 % 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) | 34 / 100 |
| Our confidence | 83% |
| Coordinates | 37.8546, -90.1852 |
| Nearest City | Farmington (22 km) |
| Population Exposed | 18.2K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-03-15T22:43:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.10fb18bbf094c24316ed1af9b30842ad |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Macoupin, IL; De Witt, IL; Logan, IL; McLean, IL; Tazewell, IL; Ste. Genevieve, MO and 10 more areas |
| Headline | Severe Thunderstorm Warning issued March 15 at 5:43PM CDT until March 15 at 5:45PM CDT by NWS St Louis MO |
| Expires | 2026-03-15T17:53:00-05:00 |
| SenderName | NWS St Louis MO |
| HasExactCoords | true |
| MergedCount | 13 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.10fb18bbf094c24316ed1af9b30842adcc82ffcf.001.1","noaa_urn:oid:2.49.0.1.840.0.8b5bbbc12d1b8084fd65b2724d3a8c02f75aefe0.001.1","noaa_urn:oid:2.49.0.1.840.0.a260a118ff1293ed04fed1a65f95bb88a9ea02dc.002.1","noaa_urn:oid:2.49.0.1.840.0.523e4def1b83e17cc0fb5b4a980138b7bd6e68c6.001.1","noaa_urn:oid:2.49.0.1.840.0.4325eca8bc3fd756b5e424bd600639dc8684e939.001.1","noaa_urn:oid:2.49.0.1.840.0.81f74b7661401003160caf2c66cbc11c91f64ebd.001.1","noaa_urn:oid:2.49.0.1.840.0.e7a6d2cb2a79d7f871131ad444faab689f8518b5.001.1","noaa_urn:oid:2.49.0.1.840.0.79f3418d6a65930b68af97742068c10ccd75d13d.001.1","noaa_urn:oid:2.49.0.1.840.0.febde32990300f4e65e67c27d078a987c81bf944.002.1","noaa_urn:oid:2.49.0.1.840.0.9d2b6f5ef05da762f631ab272d74a55d37169f6c.001.1","noaa_urn:oid:2.49.0.1.840.0.bc8a58943d9c6d318b7a50eb6a2ad6ed1f70ee65.001.1","noaa_urn:oid:2.49.0.1.840.0.7797c51a89929f957111e450acb3ba8dc866e8d3.001.1","noaa_urn:oid:2.49.0.1.840.0.d29aabd2f614b72bb02d3ebef519eb9f2b65790e.001.1"] |
| Iem TypeSummary | C |
| Iem City | 1 NE De Soto |
| Iem County | Jefferson |
| Iem State | MO |
| Iem Wfo | LSX |
| Iem Remark | Corrects previous funnel cloud report from 1 NE De Soto. Observer noted rotating clouds with the funnel cloud. |
| MergedSources | [{"id":"iem_C_38.150_-90.560_1773611280000","source":"iem","severity":"low","severityValue":25,"timestamp":1773611280000,"latitude":38.15,"longitude":-90.56}] |
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 near Farmington?
Calamity.live data shows a weather event with CalamityScore 34/100, near Farmington (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.