Severe Flood ● Closed
Flood Warning issued September 20 at 7:10PM CDT until September 21 at 11:00AM CDT by NWS Chicago IL, United States of America
Loading live data… · Marker positions are approximate; severity is labelled in each popup. Sources: USGS, GDACS, NASA EONET, NOAA/NWS, EMSC.
* WHAT...Flooding caused by excessive rainfall on the Green River and
nearby tributaries continues.
* WHERE...Portions of Lee County in north central Illinois...
* WHEN...Until 1100 AM CDT Monday.
* IMPACTS...Creeks and streams have risen out of their banks. Roads
and streets are flooded. Flooding of structures is occurring. High
water may be slow to recede from flooded areas.
* ADDITIONAL DETAILS...
- At 654 PM CDT, emergency management officials reported that
flooding was ongoing along the Green River. Multiple structures
at and near O'Connell's RV Campground remain surrounded by flood
waters as of 700 PM CDT on Sunday, September 20th, and some roads
in the area are still flooded as well.
- Some locations that will experience flooding include...
Amboy.
- http://www.weather.gov/safety/flood
Measurements
| Coordinates | 41.6814, -89.4107 |
|---|---|
| Region | Lee, IL |
| Location Precision | polygon |
| Issuing Authority | United States of America — us-noaa-nws-en |
| Cap Urgency | Expected |
| Cap Certainty | Likely |
| Cap Expires | 2026-09-21T11:00:00-05:00 |
Official source
Warnings courtesy of the issuing national meteorological service, via the WMO Alert Hub.
This is an official warning issued by the authority named above. Follow its instructions and those of your local emergency services.
Severity as published by WMO Alert Hub (national weather services).
View original reportAlso reported by: NWS NWS
This event as JSON · API and licence
Source updated 28 days ago (Sep 21, 2026 00:11 UTC) · we last heard from WMO Alert Hub (national weather services) 27 seconds ago
On a slow connection? Low-bandwidth version — no map, no scripts, under 14 KB.
Satellite view, before and after
The latest clear Sentinel-2 pass before this event and the earliest one after it.
11 Sep 2026, 9 days before this event. 4.9% cloud across the tile.
4 Oct 2026, 14 days after this event. 0% cloud across the tile.
The white ring marks where the event was reported.
Each image is a preview of a whole Sentinel-2 tile — an area of roughly 110 by 110 km, where one pixel is about 320 metres — not a close-up of the event, which may be a small part of it. "Clear" means under 30% cloud across the entire tile, so the exact place that matters can still be hidden. These are pictures for context, not an assessment of damage.
Contains modified Copernicus Sentinel data 2026, found through the Earth Search catalogue (Element 84) and served from the AWS Open Data Sentinel-2 archive.
Official authorities in United States
If you are there, these are the bodies whose instructions apply. This site is not an emergency service and does not issue warnings.
More for United States →What to do
Follow the instructions issued by WMO Alert Hub (national weather services) and your local emergency services. The guidance below is background.
Flood preparation, evacuation decisions, and the dangers of driving or walking through floodwater.
Open Flood Safety Guide →Earlier flood events in United States
Severe and extreme events of the same kind, before this one. Listed for scale, not because they are connected to it.
Nearby & related events
Disclaimer: figures are automatic feeds from the named agencies and may be revised. Do not use this page for life-safety decisions — follow official local emergency services.