Right now
The most recent data we hold from NOAA arrived 4 hours 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 5 July 2026 at 01:00 UTC. It is kept here as a record.
It is the 9th strongest of the 26 detections recorded within 20 km of this point since 18 April 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: Flash Flood Warning issued July 4 at 2:58PM CDT until July 4 at 8:00PM CDT by NWS Quad Cities IA IL
Urban PEI: 133,448 within a heuristic 50 km radius; not unique people.
Nearby, since 18 April 2026
- August 12, 2026 · score 43 · 15.0 km
- August 12, 2026 · score 67 · 15.7 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 | 0.88/1 |
| Coordinates | 41.5681, -88.8993 |
| Nearest City | Ottawa (25 km) |
| Urban exposure index (PEI) | 133.4K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-04T19:58:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.bd4c19d57942e4538e6de434d674c9c1 |
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: 2026-07-04T19:58:00.000Z.
First archived: 2026-07-04T20:04:43.114Z. 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 | Bureau, IL; Putnam, IL; Kane, IL; Kendall, IL; De Kalb, IL; La Salle, IL; Lee, IL |
| Headline | Flash Flood Warning issued July 4 at 2:58PM CDT until July 4 at 8:00PM CDT by NWS Quad Cities IA IL |
| Expires | 2026-07-04T20:00:00-05:00 |
| SenderName | NWS Quad Cities IA IL |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.bd4c19d57942e4538e6de434d674c9c183614cd0.001.1","noaa_urn:oid:2.49.0.1.840.0.607823aa809cc8a895f06545ae9460c99ade2940.001.1","noaa_urn:oid:2.49.0.1.840.0.4f50cd4b11b288a6ea330ad6bd4e1d2a9da61a28.001.1"] |
| Iem TypeSummary | F |
| Iem City | 2 N Hampshire |
| Iem County | Kane |
| Iem State | IL |
| Iem Wfo | LOT |
| Iem Remark | A few inches of standing water were reported along Big Timber Rd near Prairie Ridge. |
| MergedSources | [{"id":"iem_R_41.570_-89.350_1783194240000","source":"iem","severity":"low","severityValue":25,"timestamp":1783194240000,"latitude":41.57,"longitude":-89.35},{"id":"iem_F_42.130_-88.520_1783193700000","source":"iem","severity":"low","severityValue":25,"timestamp":1783193700000,"latitude":42.13,"longitude":-88.52}] |
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 Ottawa?