Right now
The most recent data we hold from NOAA arrived 40 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 4 July 2026 at 20:45 UTC. It is kept here as a record.
It is the 14th strongest of the 32 detections recorded within 20 km of this point since 10 March 2026. 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: Severe Thunderstorm Warning issued July 4 at 3:20PM CDT until July 4 at 3:45PM CDT by NWS Chicago IL
Nearby, since 10 March 2026
- July 4, 2026 · score 22 · 1.8 km
- June 11, 2026 · score 46 · 7.0 km
- July 4, 2026 · score 63 · 9.9 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 22 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) | 22 / 100 |
| Legacy data-support index | 0.58/1 |
| Coordinates | 40.8286, -88.4223 |
| Nearest City | Bourbonnais (57 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-07-04T20:20:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.9661b1a12b822de9ee0e101cebbee6a3 |
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: 2026-07-04T20:20:00.000Z.
First archived: 2026-07-04T20:30:37.889Z. 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 | Kane, IL; Kendall, IL; Vermilion, IL; McLean, IL; Woodford, IL and 2 more areas |
| Headline | Severe Thunderstorm Warning issued July 4 at 3:20PM CDT until July 4 at 3:45PM CDT by NWS Chicago IL |
| Expires | 2026-07-04T15:45:00-05:00 |
| SenderName | NWS Chicago IL |
| HasExactCoords | true |
| MergedCount | 5 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.9661b1a12b822de9ee0e101cebbee6a358c869b3.001.1","noaa_urn:oid:2.49.0.1.840.0.36d16663049919b2abb1640730ec08058641bd40.001.1","noaa_urn:oid:2.49.0.1.840.0.d10e8fd2906c137bb6ddc00c0e7c78938c8b3af2.001.1","noaa_urn:oid:2.49.0.1.840.0.c308c802f3fddc40f8c8822ce712b930b094fed6.001.1","noaa_urn:oid:2.49.0.1.840.0.9178d9a23c5cd3776fed47e4ef79da8b5cc17c08.001.1"] |
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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