This alert expired on 8 June 2026 at 22:05 UTC. It is kept here as a record.
It is the 4th strongest of the 96 detections recorded within 20 km of this point since 15 March 2026. Another comparable one was recorded here earlier the same day. 4 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued June 8 at 4:55PM CDT until June 8 at 5:00PM CDT by NWS Lincoln IL
An estimated 39,309 people live within 50 km of this point.
Nearby, since 15 March 2026
- July 4, 2026 · score 34 · 5.0 km
- July 3, 2026 · score 34 · 18.6 km
- July 27, 2026 · score 34 · 22.8 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 81 % 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 | 81% |
| Coordinates | 39.3602, -88.4620 |
| Nearest City | Mattoon (15 km) |
| Population Exposed | 39.3K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-08T21:55:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.336a0fb5d1a8e60f024efa08ae039e34 |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Moultrie, IL; Shelby, IL; Coles, IL; Cumberland, IL; Effingham, IL; Jasper, IL |
| Headline | Flash Flood Warning issued June 8 at 4:55PM CDT until June 8 at 5:00PM CDT by NWS Lincoln IL |
| Expires | 2026-06-08T17:05:00-05:00 |
| SenderName | NWS Lincoln IL |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.336a0fb5d1a8e60f024efa08ae039e34123e5ef9.001.1","noaa_urn:oid:2.49.0.1.840.0.72562f44c040b62134097cf3c0fa8768dfdf8729.001.1"] |
Safety Information
During flooding: never walk, swim, or drive through floodwaters. Six inches of moving water can knock you down, and one foot of water can sweep away a vehicle. Move to higher ground if waters rise. After flooding, avoid contact with floodwater which may contain sewage, chemicals, or debris. Follow local emergency service guidance.
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.