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 12 August 2026 at 14:45 UTC. It is kept here as a record.
It is the 3rd strongest of the 43 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: Severe Thunderstorm Warning issued August 12 at 9:11AM CDT until August 12 at 9:45AM CDT by NWS Chicago IL
Urban PEI: 251,154 within a heuristic 50 km radius; not unique people.
Nearby, since 10 March 2026
- March 10, 2026 · score 67 · 4.5 km
- June 12, 2026 · score 16 · 13.9 km
- May 16, 2026 · score 43 · 16.2 km
How we know
3 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 43 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) | 43 / 100 |
| Legacy data-support index | 0.91/1 |
| Coordinates | 41.0973, -89.6970 |
| Nearest City | North Peoria (43 km) |
| Urban exposure index (PEI) | 251.2K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-12T14:11:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.981f4d2ba3e1b6fe7e54a119805a6c9a |
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: 2026-08-12T14:11:00.000Z.
First archived: 2026-08-12T14:15:14.106Z. 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 | La Salle, IL; De Kalb, IL; Lee, IL; Grundy, IL; Kane, IL; Kendall, IL and 3 more areas |
| Headline | Severe Thunderstorm Warning issued August 12 at 9:11AM CDT until August 12 at 9:45AM CDT by NWS Chicago IL |
| Expires | 2026-08-12T09:45:00-05:00 |
| SenderName | NWS Chicago IL |
| HasExactCoords | true |
| MergedCount | 6 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.981f4d2ba3e1b6fe7e54a119805a6c9a2a86c38e.001.1","noaa_urn:oid:2.49.0.1.840.0.b265da5a850d76cb2c0419d6b2bb1b606bc0d7c7.002.1","noaa_urn:oid:2.49.0.1.840.0.23904b0b9be13a2459b9d505508627e951bef0ac.001.1","noaa_urn:oid:2.49.0.1.840.0.94711bcfd930ddfaf8cbd4b144d3b25bb7d2e3f4.002.1","noaa_urn:oid:2.49.0.1.840.0.7f256132b80b7b7d9474d28bbf081b2b16e33c0e.002.1","noaa_urn:oid:2.49.0.1.840.0.44fc8c35dd0208e9e8943126f19919da64f035b1.001.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 50 |
| Iem Unit | MPH |
| Iem City | Cambridge |
| Iem County | Henry |
| Iem State | IL |
| Iem Wfo | DVN |
| MergedSources | [{"id":"iem_R_41.660_-90.080_1786539900000","source":"iem","severity":"low","severityValue":25,"timestamp":1786539900000,"latitude":41.66,"longitude":-90.08},{"id":"iem_G_41.310_-90.190_1786540440000","source":"iem","severity":"low","severityValue":25,"timestamp":1786540440000,"latitude":41.31,"longitude":-90.19}] |
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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