This alert expired on 24 June 2026 at 23:48 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. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Tornado Warning issued June 24 at 6:39PM CDT until June 24 at 6:45PM CDT by NWS Chicago IL
An estimated 1,141,492 people live within 50 km of this point.
Nearby, since 16 March 2026
- July 27, 2026 · score 76 · 2.8 km
- June 24, 2026 · score 72 · 5.3 km
- August 9, 2026 · score 43 · 5.6 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, at 78 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Event Data
| Type | Severe weather |
| Severity | critical |
| Calamity Score (ours) | 76 / 100 |
| Our confidence | 78% |
| Coordinates | 42.8572, -88.4607 |
| Nearest City | Waukesha (25 km) |
| Population Exposed | 1.1M within 50 km |
| Impact Tier | catastrophic |
| Timestamp | 2026-06-24T23:39:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Tornado Warning_noaa_urn:oid:2.49.0.1.840.0.6d243d63ec8a8aea047da2c252f3b5fe |
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 6:39PM CDT until June 24 at 6:45PM CDT by NWS Chicago IL |
| Expires | 2026-06-24T18:48:00-05:00 |
| SenderName | NWS Chicago IL |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.6d243d63ec8a8aea047da2c252f3b5fe3bda3c38.001.1","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 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 Waukesha?
Calamity.live data shows a weather event with CalamityScore 76/100, near Waukesha (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.