This alert expired on 4 July 2026 at 10:30 UTC. It is kept here as a record.
It is the 4th strongest of the 55 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 July 4 at 5:09AM CDT until July 4 at 5:30AM CDT by NWS Quad Cities IA IL
An estimated 278,494 people live within 50 km of this point.
Nearby, since 15 March 2026
- July 10, 2026 · score 43 · 2.6 km
- July 9, 2026 · score 43 · 2.6 km
- July 11, 2026 · score 43 · 8.9 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 43 out of 100, at 86 % 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 | 86% |
| Coordinates | 41.8511, -91.3589 |
| Nearest City | North Liberty (23 km) |
| Population Exposed | 278.5K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-04T10:09:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.5f28bb20b293f1d6abc6d166085d90a611401b03.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Cedar, IA; Johnson, IA; Linn, IA |
| Headline | Severe Thunderstorm Warning issued July 4 at 5:09AM CDT until July 4 at 5:30AM CDT by NWS Quad Cities IA IL |
| Expires | 2026-07-04T05:30:00-05:00 |
| SenderName | NWS Quad Cities IA IL |
| HasExactCoords | true |
| Iem TypeSummary | G |
| Iem Magnitude | 58 |
| Iem Unit | MPH |
| Iem City | 2 ESE Homestead |
| Iem County | Iowa |
| Iem State | IA |
| Iem Wfo | DVN |
| MergedSources | [{"id":"iem_G_41.760_-91.830_1783157100000","source":"iem","severity":"low","severityValue":25,"timestamp":1783157100000,"latitude":41.76,"longitude":-91.83}] |
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 North Liberty?
Calamity.live data shows a weather event with CalamityScore 43/100, near North Liberty (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.