This alert expired on 4 July 2026 at 22:45 UTC. It is kept here as a record.
It is the 4th strongest of the 89 detections recorded within 20 km of this point since 15 March 2026. The last comparable one was on 3 July 2026. 30 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 4 at 4:42PM CDT until July 4 at 5:45PM CDT by NWS St Louis MO
An estimated 39,309 people live within 50 km of this point.
Nearby, since 15 March 2026
- June 8, 2026 · score 34 · 5.0 km
- July 3, 2026 · score 34 · 18.5 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 34 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) | 34 / 100 |
| Our confidence | 77% |
| Coordinates | 39.3964, -88.4962 |
| Nearest City | Mattoon (14 km) |
| Population Exposed | 39.3K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-04T21:42:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.0d6758d80a0015757bf14c595cbba2ee |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Monroe, IL; Randolph, IL; St. Clair, IL; Washington, IL; Gibson, IN; Posey, IN; Vanderburgh, IN; St. Charles, MO; St. Louis, MO and 3 more areas |
| Headline | Severe Thunderstorm Warning issued July 4 at 4:42PM CDT until July 4 at 5:45PM CDT by NWS St Louis MO |
| Expires | 2026-07-04T17:45:00-05:00 |
| SenderName | NWS St Louis MO |
| HasExactCoords | true |
| MergedCount | 6 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.0d6758d80a0015757bf14c595cbba2eea4be73bd.001.1","noaa_urn:oid:2.49.0.1.840.0.9a54d71857a9dc402184198c508f9a03ee75b722.001.1","noaa_urn:oid:2.49.0.1.840.0.a8d87350899adcbf893bac464eabb2f9b37a6c66.001.1","noaa_urn:oid:2.49.0.1.840.0.0ae098eeaa4afbc5a146c57c693c007698c42526.001.1","noaa_urn:oid:2.49.0.1.840.0.ba4042c21df662fee5a1a56f001127960a1dab31.001.1","noaa_urn:oid:2.49.0.1.840.0.3dc9b1afba0b145984f6c34943502b6fc973849f.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.
Want to know when something happens near Mattoon?
Calamity.live data shows a weather event with CalamityScore 34/100, near Mattoon (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.