Right now
The most recent data we hold from NOAA arrived 2 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
2 other detections within 20 km in the last 24 hours, the nearest 25 km from here.
This alert expired on 4 July 2026 at 10:30 UTC. It is kept here as a record.
It is the 9th strongest of the 102 detections recorded within 20 km of this point since 11 March 2026. Another comparable one was recorded here earlier the same day. 5 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 4 at 4:53AM CDT until July 4 at 5:30AM CDT by NWS Quad Cities IA IL
Urban PEI: 278,494 within a heuristic 50 km radius; not unique people.
Nearby, since 11 March 2026
- July 5, 2026 · score 43 · 4.8 km
- September 9, 2026 · score 37 · 4.9 km
- July 4, 2026 · score 43 · 8.2 km
How we know
2 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 43 out of 100.
This is our versioned heuristic index, not source severity or a calibrated probability. Urban PEI does not count unique people.
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 |
| Legacy data-support index | 0.86/1 |
| Coordinates | 41.8462, -91.4575 |
| Nearest City | North Liberty (16 km) |
| Urban exposure index (PEI) | 278.5K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-04T09:53:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.6e606d78b5d0c32d4efec8d48264cc0de584b97d.001.1 |
Physical priority index · v1. Heuristic priority, not calibrated probability, predictive accuracy or damage. The legacy data-support index combines assigned source support and field availability. Urban PEI is distance-weighted and does not count unique people; zero does not establish that nobody is present. Model cards.
Source and revision timeline
Source: noaa. Occurrence: 2026-07-04T09:53:00.000Z.
First archived: 2026-07-04T10:05:04.888Z. Material modification: not recorded.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
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 4:53AM 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 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.
Review the area, threshold and delivery channel in your account.
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