This alert expired on 18 May 2026 at 09:45 UTC. It is kept here as a record.
It is the 4th strongest of the 75 detections recorded within 20 km of this point since 16 March 2026. Another comparable one was recorded here earlier the same day. 5 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 18 at 4:02AM CDT until May 18 at 4:45AM CDT by NWS Quad Cities IA IL
An estimated 266,802 people live within 50 km of this point.
Nearby, since 16 March 2026
- May 18, 2026 · score 43 · 7.7 km
- July 8, 2026 · score 43 · 8.5 km
- August 12, 2026 · score 43 · 13.0 km
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 43 out of 100, at 91 % 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 | 91% |
| Coordinates | 41.6760, -90.3280 |
| Nearest City | Clinton (22 km) |
| Population Exposed | 266.8K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-18T09:02:00.000Z |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Rock Island, IL; Whiteside, IL; Clinton, IA; Scott, IA |
| Headline | Severe Thunderstorm Warning issued May 18 at 4:02AM CDT until May 18 at 4:45AM CDT by NWS Quad Cities IA IL |
| Expires | 2026-05-18T04:45:00-05:00 |
| SenderName | NWS Quad Cities IA IL |
| HasExactCoords | true |
| Iem TypeSummary | H |
| Iem Magnitude | 1 |
| Iem Unit | Inch |
| Iem City | 1 WSW Bettendorf |
| Iem County | Scott |
| Iem State | IA |
| Iem Wfo | DVN |
| MergedSources | [{"id":"iem_H_41.570_-90.480_1779094260000","source":"iem","severity":"low","severityValue":25,"timestamp":1779094260000,"latitude":41.57,"longitude":-90.48},{"id":"iem_H_41.560_-90.500_1779094440000","source":"iem","severity":"low","severityValue":25,"timestamp":1779094440000,"latitude":41.56,"longitude":-90.5}] |
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.
Calamity.live data shows a weather event with CalamityScore 43/100, near Clinton (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 191 scientific monitoring sources.