This alert expired on 12 August 2026 at 15:45 UTC. It is kept here as a record.
It is the 4th strongest of the 46 detections recorded within 20 km of this point since 10 March 2026. The last comparable one was on 11 August 2026. 7 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued August 12 at 9:55AM CDT until August 12 at 10:45AM CDT by NWS Chicago IL
An estimated 1,031,087 people live within 50 km of this point.
Nearby, since 10 March 2026
- June 10, 2026 · score 46 · 5.7 km
- July 4, 2026 · score 48 · 8.1 km
- June 25, 2026 · score 52 · 8.2 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 52 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) | 52 / 100 |
| Our confidence | 86% |
| Coordinates | 41.2800, -87.9560 |
| Nearest City | Bourbonnais (15 km) |
| Population Exposed | 1.0M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-12T14:55:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.abcbf8acd0df6a07bd3a76297f41fc880ae17c0f.002.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Kankakee, IL; Will, IL |
| Headline | Severe Thunderstorm Warning issued August 12 at 9:55AM CDT until August 12 at 10:45AM CDT by NWS Chicago IL |
| Expires | 2026-08-12T10:45:00-05:00 |
| SenderName | NWS Chicago IL |
| HasExactCoords | true |
| Iem TypeSummary | G |
| Iem Magnitude | 60 |
| Iem Unit | MPH |
| Iem City | Somonauk |
| Iem County | De Kalb |
| Iem State | IL |
| Iem Wfo | LOT |
| MergedSources | [{"id":"iem_G_41.630_-88.680_1786544340000","source":"iem","severity":"low","severityValue":25,"timestamp":1786544340000,"latitude":41.63,"longitude":-88.68}] |
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 Bourbonnais?
Calamity.live data shows a weather event with CalamityScore 52/100, near Bourbonnais (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.