Right now
The most recent data we hold from NOAA arrived 3 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 11 June 2026 at 23:45 UTC. It is kept here as a record.
It is the 4th strongest of the 45 detections recorded within 20 km of this point since 10 March 2026. Another comparable one was recorded here earlier the same day. 4 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Tornado Warning issued June 11 at 6:29PM CDT until June 11 at 6:45PM CDT by NWS Chicago IL
An estimated 18,342 people live within 50 km of this point.
Nearby, since 10 March 2026
- June 6, 2026 · score 22 · 11.0 km
- August 10, 2026 · score 63 · 13.7 km
- May 16, 2026 · score 34 · 15.2 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 58 out of 100, at 80 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
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) | 58 / 100 |
| Our confidence | 80% |
| Coordinates | 41.0205, -88.5787 |
| Nearest City | Ottawa (43 km) |
| Population Exposed | 18.3K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-11T23:29:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Tornado Warning_noaa_urn:oid:2.49.0.1.840.0.81f7196756f6bdb433ddd7bc8ae915d1 |
Score Breakdown
Technical Details
| Event | Tornado Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Grundy, IL; Kankakee, IL; Livingston, IL; Woodford, IL; Grundy, IL |
| Headline | Tornado Warning issued June 11 at 6:29PM CDT until June 11 at 6:45PM CDT by NWS Chicago IL |
| Expires | 2026-06-11T18:45:00-05:00 |
| SenderName | NWS Chicago IL |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.81f7196756f6bdb433ddd7bc8ae915d10695b1b2.001.1","noaa_urn:oid:2.49.0.1.840.0.5d1a7ee64e63533fc29a0e6c36f9cefbfdfedfb0.002.1","noaa_urn:oid:2.49.0.1.840.0.87fa9d522f20605a77ef20c40bfae04d12f911d9.002.1"] |
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.
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