This alert expired on 11 June 2026 at 23:30 UTC. It is kept here as a record.
It is the 16th strongest of the 47 detections recorded within 20 km of this point since 15 April 2026. The last comparable one was on 10 June 2026. 5 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued June 11 at 5:39PM CDT until June 11 at 6:30PM CDT by NWS Chicago IL
An estimated 516,665 people live within 50 km of this point.
Nearby, since 15 April 2026
- August 11, 2026 · score 43 · 6.1 km
- June 10, 2026 · score 41 · 11.7 km
- June 10, 2026 · score 41 · 12.5 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 41 out of 100, at 80 % 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) | 41 / 100 |
| Our confidence | 80% |
| Coordinates | 42.4420, -88.7350 |
| Nearest City | Belvidere (22 km) |
| Population Exposed | 516.7K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-11T22:39:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.84b9984640896ce1f86b78eb0045d9e3 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Boone, IL; De Kalb, IL; McHenry, IL; Ogle, IL; Winnebago, IL; Rock, WI; Walworth, WI |
| Headline | Severe Thunderstorm Warning issued June 11 at 5:39PM CDT until June 11 at 6:30PM CDT by NWS Chicago IL |
| Expires | 2026-06-11T18:30:00-05:00 |
| SenderName | NWS Chicago IL |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.84b9984640896ce1f86b78eb0045d9e35464898a.001.1","noaa_urn:oid:2.49.0.1.840.0.097a6822295c493a8f5ff0adbe5e58f475b9d82d.001.1"] |
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 Belvidere?
Calamity.live data shows a weather event with CalamityScore 41/100, near Belvidere (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.