This alert expired on 15 March 2026 at 15:30 UTC. It is kept here as a record.
It is the 4th strongest of the 46 detections recorded within 20 km of this point since 15 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 10:00AM CDT until March 15 at 10:30AM CDT by NWS Quad Cities IA IL
An estimated 172,057 people live within 50 km of this point.
Nearby, since 15 March 2026
- August 7, 2026 · score 37 · 8.6 km
- August 7, 2026 · score 67 · 9.5 km
- June 18, 2026 · score 37 · 11.3 km
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 43 out of 100, at 88 % 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) | 43 / 100 |
| Our confidence | 88% |
| Coordinates | 41.8617, -91.0667 |
| Nearest City | Iowa City (44 km) |
| Population Exposed | 172.1K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-03-15T15:00:00.000Z |
| Source | https://api.weather.gov/alerts/urn-oid-2_49_0_1_840_0_361133b4ea9cd1dfac2594bce30cdd0f2cbd5f79_001_1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Cedar, IA |
| Headline | Severe Thunderstorm Warning issued March 15 at 10:00AM 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 |
| Iem TypeSummary | H |
| Iem Magnitude | 1.5 |
| Iem Unit | Inch |
| Iem City | 2 S Hills |
| Iem County | Johnson |
| Iem State | IA |
| Iem Wfo | DVN |
| Iem Remark | penny to ping pong. |
| MergedSources | [{"id":"iem_H_41.610_-91.390_1773585600000","source":"iem","severity":"low","severityValue":25,"timestamp":1773585600000,"latitude":41.61,"longitude":-91.39},{"id":"iem_H_41.550_-91.530_1773585000000","source":"iem","severity":"low","severityValue":25,"timestamp":1773585000000,"latitude":41.55,"longitude":-91.53}] |
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 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 43/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.