This alert expired on 10 August 2026 at 06:15 UTC. It is kept here as a record.
It is the 2nd strongest of the 23 detections recorded within 20 km of this point since 4 April 2026. Another comparable one was recorded here earlier the same day. 11 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued August 9 at 11:00PM CDT until August 10 at 1:15AM CDT by NWS Chicago IL
An estimated 91,299 people live within 50 km of this point.
Nearby, since 4 April 2026
- June 11, 2026 · score 37 · 24.2 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 39 out of 100, at 86 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
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) | 39 / 100 |
| Our confidence | 86% |
| Coordinates | 41.7392, -89.1477 |
| Nearest City | Dixon (30 km) |
| Population Exposed | 91.3K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-10T04:00:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.053c720f423f92eec0d748bbbbbdffa531c53c70.001.1 |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Lee, IL |
| Headline | Flash Flood Warning issued August 9 at 11:00PM CDT until August 10 at 1:15AM CDT by NWS Chicago IL |
| Expires | 2026-08-10T01:15:00-05:00 |
| SenderName | NWS Chicago IL |
| HasExactCoords | true |
| Iem TypeSummary | D |
| Iem City | 5 N Sublette |
| Iem County | Lee |
| Iem State | IL |
| Iem Wfo | LOT |
| Iem Remark | Lee County Sheriffs Office reports tree branches downed near Shaw Road and Inlet Road. Possible tornado. Time estimated by radar. |
| MergedSources | [{"id":"iem_D_41.710_-89.240_1786330920000","source":"iem","severity":"low","severityValue":25,"timestamp":1786330920000,"latitude":41.71,"longitude":-89.24}] |
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.
Want to know when something happens near Dixon?
Calamity.live data shows a weather event with CalamityScore 39/100, near Dixon (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.