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 3 July 2026 at 22:15 UTC. It is kept here as a record.
It is the 4th strongest of the 69 detections recorded within 20 km of this point since 10 March 2026. Another comparable one was recorded here earlier the same day. 8 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 3 at 4:54PM CDT until July 3 at 5:15PM CDT by NWS Chicago IL
Urban PEI: 2,100,444 within a heuristic 50 km radius; not unique people.
Nearby, since 10 March 2026
- July 3, 2026 · score 52 · 0.0 km
- July 3, 2026 · score 46 · 4.9 km
- August 12, 2026 · score 52 · 7.1 km
How we know
8 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 | 0.87/1 |
| Coordinates | 41.3633, -87.7183 |
| Nearest City | Park Forest (15 km) |
| Urban exposure index (PEI) | 2.1M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-03T21:54:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.cb0f6a3b584904576b27e02be5a99dacb4b4fe41.001.1 |
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: 2026-07-03T21:54:00.000Z.
First archived: 2026-07-03T22:06:07.079Z. 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 | Will, IL |
| Headline | Severe Thunderstorm Warning issued July 3 at 4:54PM CDT until July 3 at 5:15PM CDT by NWS Chicago IL |
| Expires | 2026-07-03T17:15:00-05:00 |
| 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_G_41.520_-87.540_1783108860000","source":"iem","severity":"low","severityValue":25,"timestamp":1783108860000,"latitude":41.52,"longitude":-87.54},{"id":"iem_D_41.430_-88.230_1783105920000","source":"iem","severity":"low","severityValue":25,"timestamp":1783105920000,"latitude":41.43,"longitude":-88.23},{"id":"iem_D_41.580_-87.750_1783107900000","source":"iem","severity":"low","severityValue":25,"timestamp":1783107900000,"latitude":41.58,"longitude":-87.75},{"id":"iem_D_41.560_-87.730_1783107660000","source":"iem","severity":"low","severityValue":25,"timestamp":1783107660000,"latitude":41.56,"longitude":-87.73},{"id":"iem_D_41.730_-87.560_1783103400000","source":"iem","severity":"low","severityValue":25,"timestamp":1783103400000,"latitude":41.73,"longitude":-87.56},{"id":"iem_D_41.560_-87.490_1783108320000","source":"iem","severity":"low","severityValue":25,"timestamp":1783108320000,"latitude":41.56,"longitude":-87.49},{"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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