Right now
The most recent data we hold from NOAA arrived 17 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 1 August 2026 at 14:30 UTC. It is kept here as a record.
It is the 56th strongest of the 175 detections recorded within 20 km of this point since 10 March 2026. Another comparable one was recorded here earlier the same day. 7 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued August 1 at 6:25AM CDT until August 1 at 9:30AM CDT by NWS Chicago IL
Urban PEI: 2,389,048 within a heuristic 50 km radius; not unique people.
Nearby, since 10 March 2026
- July 27, 2026 · score 76 · 2.9 km
- August 10, 2026 · score 52 · 3.9 km
- March 11, 2026 · score 58 · 4.6 km
How we know
6 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 46 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) | 46 / 100 |
| Legacy data-support index | 0.92/1 |
| Coordinates | 41.6033, -88.2800 |
| Nearest City | Plainfield (7 km) |
| Urban exposure index (PEI) | 2.4M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-01T11:25:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.e9327d96c8517f2a7fbe65cd8e829c8aa196e9ea.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: 2026-08-01T11:25:00.000Z.
First archived: 2026-08-01T12:40:57.604Z. 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 | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Kendall, IL; Will, IL |
| Headline | Flash Flood Warning issued August 1 at 6:25AM CDT until August 1 at 9:30AM CDT by NWS Chicago IL |
| Expires | 2026-08-01T09:30:00-05:00 |
| SenderName | NWS Chicago IL |
| HasExactCoords | true |
| Iem TypeSummary | R |
| Iem Magnitude | 1.59 |
| Iem Unit | Inch |
| Iem City | NWS Chicago-Romeoville |
| Iem County | Will |
| Iem State | IL |
| Iem Wfo | LOT |
| Iem Remark | Since 1 am, 1.59 inches at NWS. |
| MergedSources | [{"id":"iem_R_41.630_-88.230_1785583800000","source":"iem","severity":"low","severityValue":25,"timestamp":1785583800000,"latitude":41.63,"longitude":-88.23},{"id":"iem_R_41.640_-88.440_1785584400000","source":"iem","severity":"low","severityValue":25,"timestamp":1785584400000,"latitude":41.64,"longitude":-88.44},{"id":"iem_R_41.830_-88.330_1785582000000","source":"iem","severity":"low","severityValue":25,"timestamp":1785582000000,"latitude":41.83,"longitude":-88.33},{"id":"iem_E_41.610_-88.280_1785583200000","source":"iem","severity":"low","severityValue":25,"timestamp":1785583200000,"latitude":41.61,"longitude":-88.28},{"id":"iem_R_41.600_-88.080_1785583800000","source":"iem","severity":"low","severityValue":25,"timestamp":1785583800000,"latitude":41.6,"longitude":-88.08}] |
Safety Information
During flooding: never walk, swim, or drive through floodwaters. Six inches of moving water can knock you down, and one foot of water can sweep away a vehicle. Move to higher ground if waters rise. After flooding, avoid contact with floodwater which may contain sewage, chemicals, or debris. Follow local emergency service guidance.
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.
Want to know when something happens near Plainfield?