Right now
The most recent data we hold from NOAA arrived 2 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 16:15 UTC. It is kept here as a record.
It is the 17th strongest of the 134 detections recorded within 20 km of this point since 16 March 2026. The last comparable one was on 13 May 2026. 6 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 18 at 10:52AM CDT until May 18 at 11:15AM CDT by NWS Lincoln IL
Nearby, since 16 March 2026
- May 13, 2026 · score 22 · 1.2 km
- May 12, 2026 · score 22 · 1.2 km
- June 26, 2026 · score 22 · 4.8 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 22 out of 100, at 65 % 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 | 65% |
| Coordinates | 38.9071, -88.6529 |
| Nearest City | Mattoon (68 km) |
| Impact Tier | minor |
| Timestamp | 2026-05-18T15:52:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.fbc41fa700f2acd0077b2bb2334b3b80f4468619.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Clay, IL; Effingham, IL; Jasper, IL |
| Headline | Severe Thunderstorm Warning issued May 18 at 10:52AM CDT until May 18 at 11:15AM CDT by NWS Lincoln IL |
| Expires | 2026-05-18T11:15:00-05:00 |
| SenderName | NWS Lincoln IL |
| HasExactCoords | true |
| Iem TypeSummary | H |
| Iem Magnitude | 1 |
| Iem Unit | Inch |
| Iem City | Lerna |
| Iem County | Coles |
| Iem State | IL |
| Iem Wfo | ILX |
| Iem Remark | Delayed report. Time estimated from radar. |
| MergedSources | [{"id":"iem_H_39.420_-88.290_1779115200000","source":"iem","severity":"low","severityValue":25,"timestamp":1779115200000,"latitude":39.42,"longitude":-88.29}] |
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.