This alert expired on 15 March 2026 at 15:30 UTC. It is kept here as a record.
No stronger detection stands among the 59 recorded within 20 km of this point since 15 March 2026 — 33 others scored the same. Another comparable one was recorded here earlier the same day. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued March 15 at 9:39AM CDT until March 15 at 10:30AM CDT by NWS Quad Cities IA IL
An estimated 302,462 people live within 50 km of this point.
Nearby, since 15 March 2026
- August 15, 2026 · score 37 · 5.4 km
- August 12, 2026 · score 43 · 6.1 km
- July 9, 2026 · score 43 · 7.5 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 80 % 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 | 80% |
| Coordinates | 41.6905, -91.2802 |
| Nearest City | Iowa City (21 km) |
| Population Exposed | 302.5K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-03-15T14:39:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe-Thunderstorm-Warning_noaa_urn-oid-2_49_0_1_840_0_f90fa5a0fcaa0edb44bed2802e35471c |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Cedar, IA; Muscatine, IA; Johnson, IA; Washington, IA |
| Headline | Severe Thunderstorm Warning issued March 15 at 9:39AM CDT until March 15 at 10:30AM CDT by NWS Quad Cities IA IL |
| Expires | 2026-03-15T10:30:00-05:00 |
| SenderName | NWS Quad Cities IA IL |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.f90fa5a0fcaa0edb44bed2802e35471cf4461d2a.001.1","noaa_urn:oid:2.49.0.1.840.0.dbf646543480ccbe2d276e26c91e2adb6ed9e721.001.1"] |
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.
Want to know when something happens near Iowa City?
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 187 scientific monitoring sources.