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 61 detections recorded within 20 km of this point since 15 March 2026. 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 9:48AM 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 7, 2026 · score 37 · 4.7 km
- July 11, 2026 · score 43 · 10.7 km
- July 11, 2026 · score 43 · 11.7 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.
Event Data
| Type | Severe weather |
| Severity | medium |
| Calamity Score (ours) | 43 / 100 |
| Our confidence | 88% |
| Coordinates | 41.8183, -91.0983 |
| Nearest City | Iowa City (40 km) |
| Population Exposed | 302.5K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-03-15T14:48:00.000Z |
| Source | https://api.weather.gov/alerts/urn-oid-2_49_0_1_840_0_43fddc598041594fc194f9d368f7164f43ee3d84_002_1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Cedar, IA |
| Headline | Severe Thunderstorm Warning issued March 15 at 9:48AM 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 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 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 187 scientific monitoring sources.