This alert expired on 11 August 2026 at 08:36 UTC. It is kept here as a record.
It is the 10th strongest of the 48 detections recorded within 20 km of this point since 15 April 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 3:26AM CDT until August 11 at 3:30AM CDT by NWS Milwaukee/Sullivan WI
An estimated 468,129 people live within 50 km of this point.
Nearby, since 15 April 2026
- June 11, 2026 · score 41 · 6.1 km
- June 24, 2026 · score 67 · 15.1 km
- July 3, 2026 · score 43 · 15.2 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 43 out of 100, at 81 % 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) | 43 / 100 |
| Our confidence | 81% |
| Coordinates | 42.4958, -88.7192 |
| Nearest City | Beloit (26 km) |
| Population Exposed | 468.1K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-11T08:26:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.6cefaea20d43a64f987fdc2038a69b21 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Rock, WI; Walworth, WI; Boone, IL; McHenry, IL |
| Headline | Severe Thunderstorm Warning issued August 11 at 3:26AM CDT until August 11 at 3:30AM CDT by NWS Milwaukee/Sullivan WI |
| Expires | 2026-08-11T03:36:00-05:00 |
| SenderName | NWS Milwaukee/Sullivan WI |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.6cefaea20d43a64f987fdc2038a69b216d9b932e.001.1","noaa_urn:oid:2.49.0.1.840.0.d29209970f87033d43fa5502ed850d3e1811f005.001.1"] |
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 Beloit?
Calamity.live data shows a weather event with CalamityScore 43/100, near Beloit (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.