Right now
The most recent data we hold from NOAA arrived 11 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
One other detection within 20 km in the last 24 hours, 19 km from here.
This alert expired on 4 July 2026 at 02:45 UTC. It is kept here as a record.
No stronger detection stands among the 100 recorded within 20 km of this point since 31 March 2026 — 20 others scored the same. Another comparable one was recorded here earlier the same day. 31 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 3 at 8:56PM CDT until July 3 at 9:45PM CDT by NWS Chicago IL
Urban PEI: 2,532,275 within a heuristic 50 km radius; not unique people.
Nearby, since 31 March 2026
- July 4, 2026 · score 52 · 6.5 km
- September 4, 2026 · score 46 · 11.4 km
- July 3, 2026 · score 46 · 12.1 km
How we know
3 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 | 41.8767, -88.4519 |
| Nearest City | Wasco (8 km) |
| Urban exposure index (PEI) | 2.5M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-04T01:56:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.19fe2dabc45f10cd6740fa0fae61da2f |
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: 2026-07-04T01:56:00.000Z.
First archived: 2026-07-04T01:58:09.881Z. 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; Kendall, IL; De Kalb, IL; Kane, IL |
| Headline | Severe Thunderstorm Warning issued July 3 at 8:56PM CDT until July 3 at 9:45PM CDT by NWS Chicago IL |
| Expires | 2026-07-03T21:45:00-05:00 |
| SenderName | NWS Chicago IL |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.19fe2dabc45f10cd6740fa0fae61da2ffb8c1412.001.1","noaa_urn:oid:2.49.0.1.840.0.ca030cc7a1364068e25f4507433183d1ce16546e.001.1"] |
| Iem TypeSummary | E |
| Iem City | 1 N Lisle |
| Iem County | DuPage |
| Iem State | IL |
| Iem Wfo | LOT |
| Iem Remark | Water is covering Route 53 at Ironwood Drive. Minor wetland flooding also noted along the DuPage River nearby, as well. |
| MergedSources | [{"id":"iem_G_41.890_-89.080_1783122900000","source":"iem","severity":"low","severityValue":25,"timestamp":1783122900000,"latitude":41.89,"longitude":-89.08},{"id":"iem_E_41.820_-88.070_1783108800000","source":"iem","severity":"low","severityValue":25,"timestamp":1783108800000,"latitude":41.82,"longitude":-88.07}] |
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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