This alert expired on 3 July 2026 at 05:15 UTC. It is kept here as a record.
It is the 7th strongest of the 118 detections recorded within 20 km of this point since 10 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 2 at 11:30PM CDT until July 3 at 12:15AM CDT by NWS Chicago IL
An estimated 2,024,158 people live within 50 km of this point.
Nearby, since 10 March 2026
- July 3, 2026 · score 52 · 5.0 km
- July 4, 2026 · score 52 · 5.3 km
- June 25, 2026 · score 52 · 8.3 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 52 out of 100, at 79 % 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) | 52 / 100 |
| Our confidence | 79% |
| Coordinates | 41.7100, -88.4600 |
| Nearest City | Yorkville (8 km) |
| Population Exposed | 2.0M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-03T04:30:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.27b7d0fab9e6fe724376a1420643a7b84e820f4e.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | De Kalb, IL; Kane, IL; Kendall, IL |
| Headline | Severe Thunderstorm Warning issued July 2 at 11:30PM CDT until July 3 at 12:15AM CDT by NWS Chicago IL |
| Expires | 2026-07-03T00:15:00-05:00 |
| SenderName | NWS Chicago IL |
| HasExactCoords | true |
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.
Calamity.live data shows a weather event with CalamityScore 52/100, near Yorkville (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.