This alert expired on 1 August 2026 at 21:45 UTC. It is kept here as a record.
It is the 5th strongest of the 164 detections recorded within 20 km of this point since 15 March 2026. Another comparable one was recorded here earlier the same day. 6 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued August 1 at 2:20PM CDT until August 1 at 4:45PM CDT by NWS Lincoln IL
An estimated 160,515 people live within 50 km of this point.
Nearby, since 15 March 2026
- July 27, 2026 · score 58 · 13.2 km
How we know
Confirmed by 6 independent sources, including NOAA.
Our own score for this event is 43 out of 100, at 90 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Event Data
| Type | Severe weather |
| Severity | medium |
| Calamity Score (ours) | 43 / 100 |
| Our confidence | 90% |
| Coordinates | 40.2780, -87.7700 |
| Nearest City | Danville (21 km) |
| Population Exposed | 160.5K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-01T19:20:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.30a76325cb6a93da6c56603b6f8e83b65dd3d9bb.001.1 |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Vermilion, IL |
| Headline | Flash Flood Warning issued August 1 at 2:20PM CDT until August 1 at 4:45PM CDT by NWS Lincoln IL |
| Expires | 2026-08-01T16:45:00-05:00 |
| SenderName | NWS Lincoln IL |
| HasExactCoords | true |
| Iem TypeSummary | R |
| Iem Magnitude | 4.02 |
| Iem Unit | Inch |
| Iem City | 1 NNE Danville |
| Iem County | Vermilion |
| Iem State | IL |
| Iem Wfo | ILX |
| MergedSources | [{"id":"iem_C_40.040_-88.160_1785617160000","source":"iem","severity":"low","severityValue":25,"timestamp":1785617160000,"latitude":40.04,"longitude":-88.16},{"id":"iem_F_40.130_-87.640_1785611100000","source":"iem","severity":"low","severityValue":25,"timestamp":1785611100000,"latitude":40.13,"longitude":-87.64},{"id":"iem_R_40.150_-87.630_1785615120000","source":"iem","severity":"low","severityValue":25,"timestamp":1785615120000,"latitude":40.15,"longitude":-87.63},{"id":"iem_C_40.270_-87.620_1785616920000","source":"iem","severity":"low","severityValue":25,"timestamp":1785616920000,"latitude":40.27,"longitude":-87.62},{"id":"iem_R_40.150_-87.630_1785615720000","source":"iem","severity":"low","severityValue":25,"timestamp":1785615720000,"latitude":40.15,"longitude":-87.63}] |
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 10 February 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 Danville?
Calamity.live data shows a weather event with CalamityScore 43/100, near Danville (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.