This alert expired on 11 August 2026 at 15:15 UTC. It is kept here as a record.
It is the 4th strongest of the 31 detections recorded within 20 km of this point since 16 March 2026. Another comparable one was recorded here earlier the same day. 6 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued August 11 at 9:10AM CDT until August 11 at 10:15AM CDT by NWS Quad Cities IA IL
An estimated 80,916 people live within 50 km of this point.
Nearby, since 16 March 2026
- August 11, 2026 · score 39 · 6.7 km
- July 3, 2026 · score 43 · 15.3 km
- July 3, 2026 · score 67 · 20.9 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 39 out of 100, at 86 % 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) | 39 / 100 |
| Our confidence | 86% |
| Coordinates | 42.0821, -89.7726 |
| Nearest City | Freeport (27 km) |
| Population Exposed | 80.9K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-11T14:10:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.61c0d315d6198bb6c295e0771ec4638b |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Bureau, IL; Henry, IL; Carroll, IL; Jo Daviess, IL; Stephenson, IL; Jo Daviess, IL; Stephenson, IL and 3 more areas |
| Headline | Severe Thunderstorm Warning issued August 11 at 9:10AM CDT until August 11 at 10:15AM CDT by NWS Quad Cities IA IL |
| Expires | 2026-08-11T10:15:00-05:00 |
| SenderName | NWS Quad Cities IA IL |
| HasExactCoords | true |
| MergedCount | 6 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.61c0d315d6198bb6c295e0771ec4638b9fd80155.002.1","noaa_urn:oid:2.49.0.1.840.0.89349c38254e87bb138897ee7d78d5282c9dc9ad.001.1","noaa_urn:oid:2.49.0.1.840.0.1c3c05e0d3d270961a5d4c5242d8099295581f2b.001.1","noaa_urn:oid:2.49.0.1.840.0.e801781b8f3782d4efc94e951984539c38e72532.001.1","noaa_urn:oid:2.49.0.1.840.0.5431c872c1f70c1302a20cc4ba7b2979df6663a0.001.1","noaa_urn:oid:2.49.0.1.840.0.5c65c9a9924436e547d5bfdd29d3fdfff7fe4955.001.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 64 |
| Iem Unit | MPH |
| Iem City | 1 WNW Maquoketa |
| Iem County | Jackson |
| Iem State | IA |
| Iem Wfo | DVN |
| Iem Remark | IADOT RWIS. |
| MergedSources | [{"id":"iem_G_42.070_-90.680_1786454100000","source":"iem","severity":"low","severityValue":25,"timestamp":1786454100000,"latitude":42.07,"longitude":-90.68}] |
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 near Freeport?
Calamity.live data shows a weather event with CalamityScore 39/100, near Freeport (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.