This alert expired on 4 July 2026 at 00:45 UTC. It is kept here as a record.
It is the 4th strongest of the 40 detections recorded within 20 km of this point since 16 March 2026. Another comparable one was recorded here earlier the same day. 14 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 3 at 7:16PM CDT until July 3 at 7:45PM CDT by NWS Chicago IL
An estimated 296,478 people live within 50 km of this point.
Nearby, since 16 March 2026
- July 3, 2026 · score 67 · 3.7 km
- July 4, 2026 · score 43 · 13.6 km
- September 3, 2026 · score 37 · 19.4 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 43 out of 100, at 84 % 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 | 84% |
| Coordinates | 42.1924, -89.3010 |
| Nearest City | Rockford (19 km) |
| Population Exposed | 296.5K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-04T00:16:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.0109189acc65f32050a3433ed7a03551 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Boone, IL; De Kalb, IL; Ogle, IL; Ogle, IL; Winnebago, IL; Carroll, IL; Jo Daviess, IL; Stephenson, IL |
| Headline | Severe Thunderstorm Warning issued July 3 at 7:16PM CDT until July 3 at 7:45PM CDT by NWS Chicago IL |
| Expires | 2026-07-03T19:45:00-05:00 |
| SenderName | NWS Chicago IL |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.0109189acc65f32050a3433ed7a03551d61b22e1.001.1","noaa_urn:oid:2.49.0.1.840.0.042c4c0a9ed4ce386fd664ee059b6ed95ab1ef16.001.1","noaa_urn:oid:2.49.0.1.840.0.25f80f1002c9991fc952a7c7bf5b70deef424cb4.001.1"] |
| Iem TypeSummary | D |
| Iem City | 2 SE Scioto Mills |
| Iem County | Stephenson |
| Iem State | IL |
| Iem Wfo | DVN |
| Iem Remark | Tree fell and took down power lines. |
| MergedSources | [{"id":"iem_D_42.330_-89.640_1783118280000","source":"iem","severity":"low","severityValue":25,"timestamp":1783118280000,"latitude":42.33,"longitude":-89.64}] |
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 Rockford?
Calamity.live data shows a weather event with CalamityScore 43/100, near Rockford (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.