This alert expired on 24 June 2026 at 23:45 UTC. It is kept here as a record.
It is the 5th strongest of the 41 detections recorded within 20 km of this point since 16 March 2026. Another comparable one was recorded here earlier the same day. One more was recorded here in the fortnight before it.
What the source measured
NOAA reported: Tornado Warning issued June 24 at 6:23PM CDT until June 24 at 6:45PM CDT by NWS Chicago IL
An estimated 521,485 people live within 50 km of this point.
Nearby, since 16 March 2026
- June 24, 2026 · score 76 · 5.3 km
- August 9, 2026 · score 43 · 5.8 km
- July 27, 2026 · score 76 · 6.2 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 72 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) | 72 / 100 |
| Our confidence | 78% |
| Coordinates | 42.8837, -88.5148 |
| Nearest City | Oconomowoc (25 km) |
| Population Exposed | 521.5K within 50 km |
| Impact Tier | catastrophic |
| Timestamp | 2026-06-24T23:23:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Tornado Warning_noaa_urn:oid:2.49.0.1.840.0.40c6b44437077759af7c6dbccb397289 |
Score Breakdown
Technical Details
| Event | Tornado Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Cook, IL; Kane, IL; Dodge, WI; Fond du Lac, WI; Green Lake, WI |
| Headline | Tornado Warning issued June 24 at 6:23PM 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:2.49.0.1.840.0.40c6b44437077759af7c6dbccb397289e1cafe8c.001.1","noaa_urn:oid:2.49.0.1.840.0.504884c4f016d9c5f69e3edd6ebe231290e70cbd.001.1"] |
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 Oconomowoc?
Calamity.live data shows a weather event with CalamityScore 72/100, near Oconomowoc (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.