Headline:
Flood Warning issued April 20 at 11:08AM CDT by NWS Chicago IL
Event:
Flood Warning
Urgency:
Expected
Effective:
April 20, 2026 - 9:08am
Expires:
April 21, 2026 - 3:15am
Description:
...Forecast flooding changed from Moderate to Major severity for the
following rivers in Illinois...
Fox River at Algonquin Lock & Dam tailwater affecting Lake IL,
Kane and McHenry Counties.
For the Fox River (Illinois)...including Algonquin Lock & Dam
tailwater, Montgomery...Major flooding is forecast.
* WHAT...Moderate flooding is occurring and major flooding is
forecast.
* WHERE...Fox River from Johnsburg downstream to Red Gate Road in
St. Charles, including the Algonquin Lock & Dam tailwater gauge.
* WHEN...Until further notice.
* IMPACTS...At 12.0 feet, Structures threatened along River Street,
Johnson Street, and Maiden Lane in East Dundee. North Harrison
Street threatened near Riverside Park in Algonquin. Washington
Street threatened in Carpentersville. Water Street, Edwards
Avenue, and Elgin Avenue threatened in East Dundee. Bayview Road
threatened in Elgin. Low-lying areas of Festival Park are
threatened in Elgin.
At 12.5 feet, Residences threatened along Edwards Avenue in East
Dundee. Prairie Trail is threatened at the river in Algonquin.
Parking lots threatened in downtown Carpentersville. Low-lying
parking lots threatened at Judson College in Elgin.
* ADDITIONAL DETAILS...
- At 10:30 AM CDT Monday the stage was 11.7 feet.
- Recent Activity...The river stage has been climbing slowly
over the last several days.
- Forecast...The river is expected to crest near 12.2 feet on
Thursday.
- Flood stage is 9.5 feet.
- Flood History...This crest compares to a previous crest of
11.8 feet on 05/23/2020.
- http://www.weather.gov/safety/flood
Instruction:
A Flood Warning means water levels above flood stage are imminent or
may already be occurring. Persons along rivers and streams in the
warned area should take immediate precautions to protect life and
property.
These forecasts are based on observed precipitation as well as
forecast precipitation 24 hours into the future. Changes to the
rainfall forecast, or any additional rainfall after 24 hours, may
cause changes to these river forecasts.
Additional information is available at www.weather.gov.
The next statement will be issued by late tonight.
Area Description:
Kane, IL; Lake, IL; McHenry, IL
Forcast Office:
NWS Chicago IL
Sender:
w-nws.webmaster@noaa.gov