This alert expired on 15 March 2026 at 14:45 UTC. It is kept here as a record.
It is the 91st strongest of the 133 detections recorded within 20 km of this point since 11 March 2026. Another comparable one was recorded here earlier the same day. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued March 15 at 9:24AM CDT until March 15 at 9:45AM CDT by NWS Quad Cities IA IL
An estimated 134,727 people live within 50 km of this point.
Nearby, since 11 March 2026
- March 16, 2026 · score 49 · 2.3 km
- March 15, 2026 · score 49 · 2.3 km
- March 11, 2026 · score 49 · 14.5 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 78 % 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 | 78% |
| Coordinates | 41.5300, -91.5220 |
| Nearest City | Iowa City (14 km) |
| Population Exposed | 134.7K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-03-15T14:24:00.000Z |
| Source | https://api.weather.gov/alerts/urn-oid-2_49_0_1_840_0_ba4db54d96868b5899f81af2513796d362903d26_001_1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Johnson, IA; Louisa, IA; Washington, IA |
| Headline | Severe Thunderstorm Warning issued March 15 at 9:24AM CDT until March 15 at 9:45AM CDT by NWS Quad Cities IA IL |
| Expires | 2026-03-15T09:45:00-05:00 |
| SenderName | NWS Quad Cities IA IL |
| HasExactCoords | true |
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 Iowa City (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.