Right now
The most recent data we hold from NOAA arrived 7 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 13:30 UTC. It is kept here as a record.
It is the 40th strongest of the 82 detections recorded within 20 km of this point since 15 March 2026. The last comparable one was on 16 May 2026. 6 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flood Warning issued May 16 at 8:20PM CDT until May 19 at 8:30PM CDT by NWS St Louis MO
An estimated 44,089 people live within 50 km of this point.
Nearby, since 15 March 2026
- May 18, 2026 · score 34 · 0.0 km
- May 17, 2026 · score 34 · 0.0 km
- May 15, 2026 · score 34 · 0.0 km
How we know
Confirmed by 11 independent sources, including NOAA.
Our own score for this event is 34 out of 100, at 91 % 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) | 34 / 100 |
| Our confidence | 91% |
| Coordinates | 38.5650, -89.3767 |
| Nearest City | O'Fallon (46 km) |
| Population Exposed | 44.1K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-17T01:20:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.2867ff88bc01dc2361cfb9c5f6c3d427c11f66a5.001.1 |
Score Breakdown
Technical Details
| Event | Flood Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Clinton, IL |
| Headline | Flood Warning issued May 16 at 8:20PM CDT until May 19 at 8:30PM CDT by NWS St Louis MO |
| Expires | 2026-05-18T08:30:00-05:00 |
| SenderName | NWS St Louis MO |
| HasExactCoords | true |
| Iem TypeSummary | D |
| Iem City | 2 ENE Centralia |
| Iem County | Marion |
| Iem State | IL |
| Iem Wfo | LSX |
| Iem Remark | Marion County EM submitted photos of two power poles down across Woods Lane between East McCord Street and Meadow Lane. Time estimated by radar. |
| MergedSources | [{"id":"iem_G_38.330_-89.190_1778968020000","source":"iem","severity":"low","severityValue":25,"timestamp":1778968020000,"latitude":38.33,"longitude":-89.19},{"id":"iem_D_38.570_-89.050_1778966040000","source":"iem","severity":"low","severityValue":25,"timestamp":1778966040000,"latitude":38.57,"longitude":-89.05},{"id":"iem_G_38.640_-88.670_1778968680000","source":"iem","severity":"low","severityValue":25,"timestamp":1778968680000,"latitude":38.64,"longitude":-88.67},{"id":"iem_H_38.530_-89.130_1778968080000","source":"iem","severity":"low","severityValue":25,"timestamp":1778968080000,"latitude":38.53,"longitude":-89.13},{"id":"iem_H_38.400_-88.930_1778967960000","source":"iem","severity":"low","severityValue":25,"timestamp":1778967960000,"latitude":38.4,"longitude":-88.93},{"id":"iem_D_38.530_-89.130_1778966280000","source":"iem","severity":"low","severityValue":25,"timestamp":1778966280000,"latitude":38.53,"longitude":-89.13},{"id":"iem_H_38.400_-88.870_1778968440000","source":"iem","severity":"low","severityValue":25,"timestamp":1778968440000,"latitude":38.4,"longitude":-88.87},{"id":"iem_D_38.620_-89.370_1778968320000","source":"iem","severity":"low","severityValue":25,"timestamp":1778968320000,"latitude":38.62,"longitude":-89.37},{"id":"iem_D_38.650_-89.070_1778966040000","source":"iem","severity":"low","severityValue":25,"timestamp":1778966040000,"latitude":38.65,"longitude":-89.07},{"id":"iem_D_38.530_-89.090_1778968080000","source":"iem","severity":"low","severityValue":25,"timestamp":1778968080000,"latitude":38.53,"longitude":-89.09}] |
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 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 34/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.