This alert expired on 18 May 2026 at 15:30 UTC. It is kept here as a record.
It is the 218th strongest of the 535 detections recorded within 20 km of this point since 15 March 2026. Another comparable one was recorded here earlier the same day. 10 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 18 at 10:14AM CDT until May 18 at 10:30AM CDT by NWS Lincoln IL
An estimated 112,563 people live within 50 km of this point.
Nearby, since 15 March 2026
- June 18, 2026 · score 49 · 11.3 km
- June 18, 2026 · score 49 · 15.5 km
- June 18, 2026 · score 49 · 18.9 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 43 out of 100, at 85 % 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) | 43 / 100 |
| Our confidence | 85% |
| Coordinates | 39.6129, -88.4586 |
| Nearest City | Mattoon (17 km) |
| Population Exposed | 112.6K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-18T15:14:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.88533567537cecc5966b5a6210d9078e |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Coles, IL; Edgar, IL; Macon, IL; Shelby, IL |
| Headline | Severe Thunderstorm Warning issued May 18 at 10:14AM CDT until May 18 at 10:30AM CDT by NWS Lincoln IL |
| Expires | 2026-05-18T10:30:00-05:00 |
| SenderName | NWS Lincoln IL |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.88533567537cecc5966b5a6210d9078eb4aee4d8.002.1","noaa_urn:oid:2.49.0.1.840.0.208867837013a348c587797334d3b6ff970051aa.002.1"] |
| Iem TypeSummary | D |
| Iem City | 1 WNW Assumption |
| Iem County | Christian |
| Iem State | IL |
| Iem Wfo | ILX |
| Iem Remark | Large tree limbs down. |
| MergedSources | [{"id":"iem_D_39.520_-89.060_1779112920000","source":"iem","severity":"low","severityValue":25,"timestamp":1779112920000,"latitude":39.52,"longitude":-89.06}] |
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 43/100, near Mattoon (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.