Right now
The most recent data we hold from NOAA arrived 89 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
Nothing else has been detected within 20 km in the last 24 hours.
This alert expired on 12 June 2026 at 00:15 UTC. It is kept here as a record.
It is the 38th strongest of the 81 detections recorded within 20 km of this point since 10 March 2026. Another comparable one was recorded here earlier the same day. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued June 11 at 6:37PM CDT until June 11 at 7:15PM CDT by NWS Milwaukee/Sullivan WI
Urban PEI: 1,398,599 within a heuristic 50 km radius; not unique people.
Nearby, since 10 March 2026
- August 11, 2026 · score 52 · 8.3 km
- June 25, 2026 · score 52 · 8.7 km
- March 11, 2026 · score 58 · 8.8 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 46 out of 100.
This is our versioned heuristic index, not source severity or a calibrated probability. Urban PEI does not count unique people.
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) | 46 / 100 |
| Legacy data-support index | 0.80/1 |
| Coordinates | 41.5746, -88.4979 |
| Nearest City | Yorkville (8 km) |
| Urban exposure index (PEI) | 1.4M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-11T23:37:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.fd874ccf631b3d8e84452d27f7bc0c74 |
Physical priority index · v1. Heuristic priority, not calibrated probability, predictive accuracy or damage. The legacy data-support index combines assigned source support and field availability. Urban PEI is distance-weighted and does not count unique people; zero does not establish that nobody is present. Model cards.
Source and revision timeline
Source: noaa. Occurrence: 2026-06-11T23:37:00.000Z.
First archived: 2026-06-11T23:43:04.091Z. Material modification: not recorded.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Fond du Lac, WI; Sheboygan, WI; Kenosha, WI; Racine, WI; De Kalb, IL; Kane, IL; Lake, IL; McHenry, IL and 7 more areas |
| Headline | Severe Thunderstorm Warning issued June 11 at 6:37PM CDT until June 11 at 7:15PM CDT by NWS Milwaukee/Sullivan WI |
| Expires | 2026-06-11T19:15:00-05:00 |
| SenderName | NWS Milwaukee/Sullivan WI |
| HasExactCoords | true |
| MergedCount | 10 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.fd874ccf631b3d8e84452d27f7bc0c74ef0610f6.001.1","noaa_urn:oid:2.49.0.1.840.0.947db16cefb85cee2ee10217623cf740b309969f.001.1","noaa_urn:oid:2.49.0.1.840.0.1fefa8128c0200006ee3c374b57016737a3fee0d.001.1","noaa_urn:oid:2.49.0.1.840.0.478399cd9d029080325e4dda7834c5329bf9eefc.001.1","noaa_urn:oid:2.49.0.1.840.0.2d356a85f34eef45a7e40694fab1c8f01ad6d369.001.1","noaa_urn:oid:2.49.0.1.840.0.f0bf7f86555402fc05671fc923acb31eaaa719cb.001.1","noaa_urn:oid:2.49.0.1.840.0.423b7a8a703d3c667d99a1e70bcf747597978803.001.1","noaa_urn:oid:2.49.0.1.840.0.4f182b9e8ed571aa83f3a96a7f28a1c5c151f087.001.1","noaa_urn:oid:2.49.0.1.840.0.86314300f253fa43225d59e4b1109161f78dfdc9.001.1","noaa_urn:oid:2.49.0.1.840.0.61d607570114adcdfa276900315a22995d0a19e1.001.1"] |
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 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.
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