Right now
The most recent data we hold from NOAA arrived 4 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 24 June 2026 at 23:45 UTC. It is kept here as a record.
No stronger detection stands among the 49 recorded within 20 km of this point since 16 March 2026 — 4 others scored the same. Another comparable one was recorded here earlier the same day. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Tornado Warning issued June 24 at 6:31PM CDT until June 24 at 6:45PM CDT by NWS Chicago IL
Urban PEI: 1,141,492 within a heuristic 50 km radius; not unique people.
Nearby, since 16 March 2026
- June 24, 2026 · score 76 · 0.0 km
- July 27, 2026 · score 76 · 2.8 km
- June 24, 2026 · score 72 · 5.3 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 76 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 | Critical |
| Calamity Score (ours) | 76 / 100 |
| Legacy data-support index | 0.78/1 |
| Coordinates | 42.8572, -88.4607 |
| Nearest City | Waukesha (25 km) |
| Urban exposure index (PEI) | 1.1M within 50 km |
| Impact Tier | catastrophic |
| Timestamp | 2026-06-24T23:31:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Tornado Warning_noaa_urn:oid:2.49.0.1.840.0.0e9aa3477b2d709fa8dcde1c3dfc7f1b |
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: 2026-06-24T23:31:00.000Z.
First archived: 2026-06-24T23:36:28.969Z. 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 | Tornado Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Cook, IL; Dodge, WI; Fond du Lac, WI |
| Headline | Tornado Warning issued June 24 at 6:31PM CDT until June 24 at 6:45PM CDT by NWS Chicago IL |
| Expires | 2026-06-24T18:45:00-05:00 |
| SenderName | NWS Chicago IL |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.0e9aa3477b2d709fa8dcde1c3dfc7f1b2d32310e.002.1","noaa_urn:oid:2.49.0.1.840.0.dbed989f536073d920bb62cbaeee384a63a0b830.002.1"] |
Safety Information
If a tornado warning is issued: go to a basement or an interior room on the lowest floor, away from windows. A vehicle and a mobile home are not shelter. Cover your head and neck. Wait for the official all-clear before going outside, and watch for downed power lines and gas leaks afterwards.
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.
Review the area, threshold and delivery channel in your account.
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