This alert expired on 15 March 2026 at 23:15 UTC. It is kept here as a record.
No stronger detection stands among the 71 recorded within 20 km of this point since 15 March 2026 — 3 others scored the same.
What the source measured
NOAA reported: Tornado Warning issued March 15 at 5:48PM CDT until March 15 at 6:15PM CDT by NWS St Louis MO
An estimated 18,181 people live within 50 km of this point.
Nearby, since 15 March 2026
- March 15, 2026 · score 58 · 20.6 km
- August 1, 2026 · score 58 · 21.0 km
How we know
Confirmed by 4 independent sources, including NOAA.
Our own score for this event is 58 out of 100, at 87 % 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 | Critical |
| Calamity Score (ours) | 58 / 100 |
| Our confidence | 87% |
| Coordinates | 37.4907, -90.2684 |
| Nearest City | Farmington (35 km) |
| Population Exposed | 18.2K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-03-15T22:48:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Tornado Warning_noaa_urn:oid:2.49.0.1.840.0.e6f683515258ca56164575e9096226f2 |
Score Breakdown
Technical Details
| Event | Tornado Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Monroe, IL; St. Clair, IL; Logan, IL; Sangamon, IL; Monroe, IL; Randolph, IL; St. Clair, IL and 3 more areas |
| Headline | Tornado Warning issued March 15 at 5:48PM CDT until March 15 at 6:15PM CDT by NWS St Louis MO |
| Expires | 2026-03-15T18:15:00-05:00 |
| SenderName | NWS St Louis MO |
| HasExactCoords | true |
| MergedCount | 6 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.e6f683515258ca56164575e9096226f267b21703.001.1","noaa_urn:oid:2.49.0.1.840.0.9738623f487ea421ba277647366bbf9dd1e66698.001.1","noaa_urn:oid:2.49.0.1.840.0.0455307c36d2d682d313434136d55a208f4b1271.001.1","noaa_urn:oid:2.49.0.1.840.0.f9fdc6c24d2fa6d9daa482d9ba63e381af7f81d0.001.1","noaa_urn:oid:2.49.0.1.840.0.ae03fc6a701bad8b27199a5719363f6cf7b3b08a.001.1","noaa_urn:oid:2.49.0.1.840.0.d2b39af2c6e6e3e45b957f6865d43aa7d216f324.001.1"] |
| Spc ReportType | wind |
| Spc Speed | 60 |
| Spc Location | 1 N Farmington |
| Spc County | St. Francois |
| Spc State | MO |
| Spc Comments | (LSX) |
| Iem TypeSummary | N |
| Iem Magnitude | 48 |
| Iem Unit | MPH |
| Iem City | 3 WNW Scott City |
Safety Information
If a tornado warning is issued: go to a basement or an interior room on the lowest floor, away from windows. A vehicle and a mobile home are not shelter. Cover your head and neck. Wait for the official all-clear before going outside, and watch for downed power lines and gas leaks afterwards.
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 58/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.