Right now
The most recent data we hold from NOAA arrived 3 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 12 June 2026 at 03:00 UTC. It is kept here as a record.
It is the 10th strongest of the 41 detections recorded within 20 km of this point since 3 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 June 11 at 6:28PM CDT until June 11 at 10:00PM CDT by NWS Chicago IL
An estimated 909,915 people live within 50 km of this point.
Nearby, since 3 April 2026
- June 10, 2026 · score 41 · 6.0 km
- July 3, 2026 · score 48 · 12.4 km
- June 25, 2026 · score 52 · 15.4 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 41 out of 100, at 80 % 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) | 41 / 100 |
| Our confidence | 80% |
| Coordinates | 42.3137, -88.5933 |
| Nearest City | Woodstock (12 km) |
| Population Exposed | 909.9K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-11T23:28:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.c0cd8510fc2817fdfe013c70c7152e21 |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Lake, IL; McHenry, IL; Winnebago, IL and 1 more areas |
| Headline | Flash Flood Warning issued June 11 at 6:28PM CDT until June 11 at 10:00PM CDT by NWS Chicago IL |
| Expires | 2026-06-11T22:00:00-05:00 |
| SenderName | NWS Chicago IL |
| HasExactCoords | true |
| MergedCount | 4 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.c0cd8510fc2817fdfe013c70c7152e21a5edb71a.001.1","noaa_urn:oid:2.49.0.1.840.0.9206bd0019e0c524820ea2163378cf50608f0d1c.001.1","noaa_urn:oid:2.49.0.1.840.0.77147f920a4267bb75a299817f9bcb2591ca097c.001.1","noaa_urn:oid:2.49.0.1.840.0.57dd150d31602cbcc58b2318b819a6642fa46447.001.1"] |
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.
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