This alert expired on 8 June 2026 at 20:00 UTC. It is kept here as a record.
It is the 18th strongest of the 87 detections recorded within 20 km of this point since 15 March 2026. The last comparable one was on 23 May 2026.
What the source measured
NOAA reported: Flash Flood Warning issued June 8 at 11:55AM CDT until June 8 at 3:00PM CDT by NWS Lincoln IL
An estimated 264,974 people live within 50 km of this point.
Nearby, since 15 March 2026
- March 16, 2026 · score 43 · 12.1 km
- June 8, 2026 · score 48 · 16.4 km
- May 23, 2026 · score 48 · 18.7 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 43 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) | 43 / 100 |
| Our confidence | 81% |
| Coordinates | 39.0514, -89.9072 |
| Nearest City | Upper Alton (26 km) |
| Population Exposed | 265.0K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-08T16:55:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.af2be5c61f95a927d10326bee4025488 |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Moultrie, IL; Shelby, IL; Madison, IL; Franklin, MO; Jefferson, MO; St. Charles, MO; St. Louis, MO; Madison, IL and 2 more areas |
| Headline | Flash Flood Warning issued June 8 at 11:55AM CDT until June 8 at 3:00PM CDT by NWS Lincoln IL |
| Expires | 2026-06-08T15:00:00-05:00 |
| SenderName | NWS Lincoln IL |
| HasExactCoords | true |
| MergedCount | 5 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.af2be5c61f95a927d10326bee4025488b18e41b1.001.1","noaa_urn:oid:2.49.0.1.840.0.4d115833ccbd0a0d3a1eb8b00bd6d735b8cae1a1.002.1","noaa_urn:oid:2.49.0.1.840.0.09297efe92ee297657b1324ada5c30d0d8b8a0d8.001.1","noaa_urn:oid:2.49.0.1.840.0.b8b88691fd81f758ead785a50dfaf667d4c15d4c.001.1","noaa_urn:oid:2.49.0.1.840.0.ed934dab8071b2a0c09c1c147309b87901dc032b.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 Upper Alton?
Calamity.live data shows a weather event with CalamityScore 43/100, near Upper Alton (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.