Right now
The most recent data we hold from NOAA arrived 12 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 02:15 UTC. It is kept here as a record.
No stronger detection stands among the 68 recorded within 20 km of this point since 31 March 2026 — 13 others scored the same. The last comparable one was on 3 July 2026. 26 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 3 at 8:22PM CDT until July 3 at 9:15PM CDT by NWS Chicago IL
Urban PEI: 2,587,264 within a heuristic 50 km radius; not unique people.
Nearby, since 31 March 2026
- July 3, 2026 · score 46 · 1.1 km
- September 2, 2026 · score 46 · 8.1 km
- June 25, 2026 · score 52 · 9.6 km
How we know
7 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 52 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) | 52 / 100 |
| Legacy data-support index | 0.90/1 |
| Coordinates | 42.0114, -88.4457 |
| Nearest City | Wasco (9 km) |
| Urban exposure index (PEI) | 2.6M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-04T01:22:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.347e1d100ea240db94b0bfc0574ae6c4e2d0c8cb.001.1 |
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: 2026-07-04T01:22:00.000Z.
First archived: 2026-07-04T01:47:23.165Z. 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 | De Kalb, IL; Kane, IL |
| Headline | Severe Thunderstorm Warning issued July 3 at 8:22PM CDT until July 3 at 9:15PM CDT by NWS Chicago IL |
| Expires | 2026-07-03T21:15:00-05:00 |
| SenderName | NWS Chicago IL |
| HasExactCoords | true |
| Iem TypeSummary | G |
| Iem Magnitude | 67 |
| Iem Unit | MPH |
| Iem City | Mokena |
| Iem County | Will |
| Iem State | IL |
| Iem Wfo | LOT |
| Iem Remark | Measured gust to 67 mph. Tree limbs blown down. |
| MergedSources | [{"id":"iem_D_41.570_-87.790_1783107480000","source":"iem","severity":"low","severityValue":25,"timestamp":1783107480000,"latitude":41.57,"longitude":-87.79},{"id":"iem_D_41.590_-87.890_1783107180000","source":"iem","severity":"low","severityValue":25,"timestamp":1783107180000,"latitude":41.59,"longitude":-87.89},{"id":"iem_G_41.890_-89.080_1783122900000","source":"iem","severity":"low","severityValue":25,"timestamp":1783122900000,"latitude":41.89,"longitude":-89.08},{"id":"iem_H_41.510_-88.080_1783106520000","source":"iem","severity":"low","severityValue":25,"timestamp":1783106520000,"latitude":41.51,"longitude":-88.08},{"id":"iem_E_41.820_-88.070_1783108800000","source":"iem","severity":"low","severityValue":25,"timestamp":1783108800000,"latitude":41.82,"longitude":-88.07},{"id":"iem_G_41.530_-87.880_1783107000000","source":"iem","severity":"low","severityValue":25,"timestamp":1783107000000,"latitude":41.53,"longitude":-87.88}] |
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.
Review the area, threshold and delivery channel in your account.
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