Weather Warnings for Illinois

Issued by the National Weather Service

Current watches, warnings, and advisories for Illinois
Alerts Updated: April 21, 2026, 2:38 am  UTC


Flood Warning issued April 20 at 9:38PM CDT until April 21 at 9:00AM CDT by NWS Milwaukee/Sullivan WI

Summary: ...The Flood Warning is extended for the following rivers in Wisconsin...Illinois... Sugar River At Brodhead affecting Green, Winnebago and Rock Counties. ...The Flood Warning continues for the following rivers in Wisconsin...Illinois... Rock River At Newville affecting Rock County. Rock River Near Lake Koshkonong affecting Rock and Jefferson Counties. Rock River At Fort Atkinson affecting Jefferson County. Rock River At Afton affecting Rock and Winnebago Counties. Rock River At Jefferson affecting Jefferson County. Rock River At Watertown affecting Jefferson County. ROCK RIVER near LEBANON-3 E-HWY MM BRIDGE affecting Dodge County. Crawfish River At Milford affecting Jefferson County. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Sugar River at Brodhead. * WHEN...Until late tomorrow morning. * IMPACTS...At 5.0 feet, Some roads become flooded about 6 miles downstream in Avon Township in Rock County. In the Avon Bottoms area of Rock County, some minor flooding develops in Sugar River Park, including the boat ramp. * ADDITIONAL DETAILS... - At 9:00 PM CDT Monday the stage was 5.2 feet. - Bankfull stage is 4.5 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 9:00 PM CDT Monday was 6.2 feet. - Forecast...The river is expected to fall below flood stage by early Tuesday morning. - Flood stage is 5.0 feet. - Flood History...This crest compares to a previous crest of 5.2 feet on 03/13/1972. - http://www.weather.gov/safety/flood
Severity:  Severe    Effective:  April 20, 2026, 9:38 pm      Expires:  April 21, 2026, 9:00 am
Area:  Winnebago, IL; Green, WI; Rock, WI


Flood Warning issued April 20 at 9:38PM CDT by NWS Milwaukee/Sullivan WI

Summary: ...The Flood Warning is extended for the following rivers in Wisconsin...Illinois... Sugar River At Brodhead affecting Green, Winnebago and Rock Counties. ...The Flood Warning continues for the following rivers in Wisconsin...Illinois... Rock River At Newville affecting Rock County. Rock River Near Lake Koshkonong affecting Rock and Jefferson Counties. Rock River At Fort Atkinson affecting Jefferson County. Rock River At Afton affecting Rock and Winnebago Counties. Rock River At Jefferson affecting Jefferson County. Rock River At Watertown affecting Jefferson County. ROCK RIVER near LEBANON-3 E-HWY MM BRIDGE affecting Dodge County. Crawfish River At Milford affecting Jefferson County. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Rock River at Afton. * WHEN...Until further notice. * IMPACTS...At 11.1 feet, Floodwaters affect Riverside Park and a road in Riverside park on the north side of Janesville and South River Road on the south side of Janesville. Floodwaters affect low spots on South River Rd on the south side of Janesville. Floodwaters affect a home on South Christian Rd on the east side of the river in the Afton area. There is extensive lowland and agricultural land flooding in the Afton and Janesville areas. * ADDITIONAL DETAILS... - At 8:00 PM CDT Monday the stage was 10.4 feet. - Bankfull stage is 8.0 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 8:00 PM CDT Monday was 10.4 feet. - Forecast...The river is expected to rise to 11.0 feet early Thursday afternoon. Additional rises are possible thereafter. - Flood stage is 9.0 feet. - Flood History...This crest compares to a previous crest of 11.0 feet on 09/13/1915. - http://www.weather.gov/safety/flood
Severity:  Severe    Effective:  April 20, 2026, 9:38 pm      Expires:  April 21, 2026, 9:45 am
Area:  Winnebago, IL; Rock, WI


Flood Warning issued April 20 at 9:30PM CDT by NWS St Louis MO

Summary: ...The Flood Warning is extended for the following rivers in Illinois...Missouri... Mississippi River at Chester. ...The Flood Warning continues for the following rivers in Illinois...Missouri... Mississippi River at Grafton. Mississippi River at Canton. Mississippi River at Saverton. Mississippi River at Winfield. Mississippi River at Hannibal. Mississippi River at Clarksville. Mississippi River at Louisiana. ...The Flood Warning is cancelled for the following rivers in Illinois...Missouri... Mississippi River at Lock & Dam 21. River forecasts are based on observed precipitation and forecast precipitation for the next 24 hours. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Mississippi River at Hannibal. * WHEN...Until further notice. * IMPACTS...At 19.0 feet, The Corps of Engineers begins flood fight procedures. At this level, preparations are made to install two flood gates at Hill Street and Center Street if the forecast exceeds 20.5 feet. * ADDITIONAL DETAILS... - At 8:15 PM CDT Monday the stage was 19.5 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 8:15 PM CDT Monday was 19.8 feet. - Forecast...The river is expected to fall to 18.2 feet Monday, April 27. - Flood stage is 17.0 feet.
Severity:  Severe    Effective:  April 20, 2026, 9:30 pm      Expires:  April 22, 2026, 9:30 am
Area:  Pike, IL; Marion, MO


Flood Warning issued April 20 at 9:30PM CDT by NWS St Louis MO

Summary: ...The Flood Warning is extended for the following rivers in Illinois...Missouri... Mississippi River at Chester. ...The Flood Warning continues for the following rivers in Illinois...Missouri... Mississippi River at Grafton. Mississippi River at Canton. Mississippi River at Saverton. Mississippi River at Winfield. Mississippi River at Hannibal. Mississippi River at Clarksville. Mississippi River at Louisiana. ...The Flood Warning is cancelled for the following rivers in Illinois...Missouri... Mississippi River at Lock & Dam 21. River forecasts are based on observed precipitation and forecast precipitation for the next 24 hours. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Mississippi River at Louisiana. * WHEN...Until further notice. * IMPACTS...At 17.0 feet, The parking area at the boat house floods. * ADDITIONAL DETAILS... - At 9:00 PM CDT Monday the stage was 18.3 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 9:00 PM CDT Monday was 18.3 feet. - Forecast...The river is expected to fall to 16.7 feet Monday, April 27. - Flood stage is 15.0 feet.
Severity:  Severe    Effective:  April 20, 2026, 9:30 pm      Expires:  April 22, 2026, 9:30 am
Area:  Pike, IL; Pike, MO


Flood Warning issued April 20 at 9:30PM CDT by NWS St Louis MO

Summary: ...The Flood Warning is extended for the following rivers in Illinois...Missouri... Mississippi River at Chester. ...The Flood Warning continues for the following rivers in Illinois...Missouri... Mississippi River at Grafton. Mississippi River at Canton. Mississippi River at Saverton. Mississippi River at Winfield. Mississippi River at Hannibal. Mississippi River at Clarksville. Mississippi River at Louisiana. ...The Flood Warning is cancelled for the following rivers in Illinois...Missouri... Mississippi River at Lock & Dam 21. River forecasts are based on observed precipitation and forecast precipitation for the next 24 hours. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Mississippi River at Clarksville. * WHEN...Until further notice. * IMPACTS...At 29.0 feet, Water enters the parking lot entrance at the Clarksville Riverfront Park. * ADDITIONAL DETAILS... - At 9:00 PM CDT Monday the stage was 28.4 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 9:00 PM CDT Monday was 28.4 feet. - Forecast...The river is expected to fall to 27.0 feet Monday, April 27. - Flood stage is 25.0 feet.
Severity:  Severe    Effective:  April 20, 2026, 9:30 pm      Expires:  April 22, 2026, 9:30 am
Area:  Calhoun, IL; Pike, MO


Flood Warning issued April 20 at 9:30PM CDT by NWS St Louis MO

Summary: ...The Flood Warning is extended for the following rivers in Illinois...Missouri... Mississippi River at Chester. ...The Flood Warning continues for the following rivers in Illinois...Missouri... Mississippi River at Grafton. Mississippi River at Canton. Mississippi River at Saverton. Mississippi River at Winfield. Mississippi River at Hannibal. Mississippi River at Clarksville. Mississippi River at Louisiana. ...The Flood Warning is cancelled for the following rivers in Illinois...Missouri... Mississippi River at Lock & Dam 21. River forecasts are based on observed precipitation and forecast precipitation for the next 24 hours. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Mississippi River at Saverton. * WHEN...Until further notice. * ADDITIONAL DETAILS... - At 8:00 PM CDT Monday the stage was 18.1 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 8:00 PM CDT Monday was 18.4 feet. - Forecast...The river is expected to fall to 16.5 feet Monday, April 27. - Flood stage is 16.0 feet.
Severity:  Severe    Effective:  April 20, 2026, 9:30 pm      Expires:  April 22, 2026, 9:30 am
Area:  Pike, IL; Ralls, MO


Flood Warning issued April 20 at 9:30PM CDT by NWS St Louis MO

Summary: ...The Flood Warning is extended for the following rivers in Illinois...Missouri... Mississippi River at Chester. ...The Flood Warning continues for the following rivers in Illinois...Missouri... Mississippi River at Grafton. Mississippi River at Canton. Mississippi River at Saverton. Mississippi River at Winfield. Mississippi River at Hannibal. Mississippi River at Clarksville. Mississippi River at Louisiana. ...The Flood Warning is cancelled for the following rivers in Illinois...Missouri... Mississippi River at Lock & Dam 21. River forecasts are based on observed precipitation and forecast precipitation for the next 24 hours. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Mississippi River at Canton. * WHEN...Until further notice. * IMPACTS...At 16.6 feet, Front Street leading to the campground and Corps park campgrounds flood at this height. * ADDITIONAL DETAILS... - At 8:00 PM CDT Monday the stage was 15.8 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 8:00 PM CDT Monday was 16.0 feet. - Forecast...The river is expected to fall to 15.1 feet Monday, April 27. - Flood stage is 15.0 feet.
Severity:  Severe    Effective:  April 20, 2026, 9:30 pm      Expires:  April 22, 2026, 9:30 am
Area:  Adams, IL; Lewis, MO


Flood Warning issued April 20 at 9:30PM CDT by NWS St Louis MO

Summary: ...The Flood Warning is extended for the following rivers in Illinois...Missouri... Mississippi River at Chester. ...The Flood Warning continues for the following rivers in Illinois...Missouri... Mississippi River at Grafton. Mississippi River at Canton. Mississippi River at Saverton. Mississippi River at Winfield. Mississippi River at Hannibal. Mississippi River at Clarksville. Mississippi River at Louisiana. ...The Flood Warning is cancelled for the following rivers in Illinois...Missouri... Mississippi River at Lock & Dam 21. River forecasts are based on observed precipitation and forecast precipitation for the next 24 hours. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Mississippi River at Winfield. * WHEN...Until further notice. * IMPACTS...At 28.3 feet, Near this height, Lakeview Drive becomes impassable and Kampville Road begins flooding in northern St. Charles County. * ADDITIONAL DETAILS... - At 9:00 PM CDT Monday the stage was 28.2 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 9:00 PM CDT Monday was 28.2 feet. - Forecast...The river is expected to rise to a crest of 28.3 feet tomorrow morning. - Flood stage is 26.0 feet.
Severity:  Severe    Effective:  April 20, 2026, 9:30 pm      Expires:  April 22, 2026, 9:30 am
Area:  Calhoun, IL; Lincoln, MO


Flood Warning issued April 20 at 9:30PM CDT until April 24 at 11:30PM CDT by NWS St Louis MO

Summary: ...The Flood Warning is extended for the following rivers in Illinois...Missouri... Mississippi River at Chester. ...The Flood Warning continues for the following rivers in Illinois...Missouri... Mississippi River at Grafton. Mississippi River at Canton. Mississippi River at Saverton. Mississippi River at Winfield. Mississippi River at Hannibal. Mississippi River at Clarksville. Mississippi River at Louisiana. ...The Flood Warning is cancelled for the following rivers in Illinois...Missouri... Mississippi River at Lock & Dam 21. River forecasts are based on observed precipitation and forecast precipitation for the next 24 hours. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Mississippi River at Chester. * WHEN...Until Friday evening. * IMPACTS...At 28.0 feet, Unleveed islands near Chester and the prison farm floods. * ADDITIONAL DETAILS... - At 9:00 PM CDT Monday the stage was 27.1 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 9:00 PM CDT Monday was 27.3 feet. - Forecast...The river is expected to rise to a crest of 28.1 feet Wednesday morning. It will then fall below flood stage Thursday afternoon. - Flood stage is 27.0 feet.
Severity:  Severe    Effective:  April 20, 2026, 9:30 pm      Expires:  April 22, 2026, 9:30 am
Area:  Jackson, IL; Randolph, IL; Perry, MO; Ste. Genevieve, MO


Flood Warning issued April 20 at 9:30PM CDT by NWS St Louis MO

Summary: ...The Flood Warning is extended for the following rivers in Illinois...Missouri... Mississippi River at Chester. ...The Flood Warning continues for the following rivers in Illinois...Missouri... Mississippi River at Grafton. Mississippi River at Canton. Mississippi River at Saverton. Mississippi River at Winfield. Mississippi River at Hannibal. Mississippi River at Clarksville. Mississippi River at Louisiana. ...The Flood Warning is cancelled for the following rivers in Illinois...Missouri... Mississippi River at Lock & Dam 21. River forecasts are based on observed precipitation and forecast precipitation for the next 24 hours. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Mississippi River at Grafton. * WHEN...Until further notice. * IMPACTS...At 21.0 feet, Water begins flooding the floor at the Palisades Marina in Portage Des Sioux. Access to homes along North Shore Drive in eastern St. Charles County becomes cut off near this height. * ADDITIONAL DETAILS... - At 9:00 PM CDT Monday the stage was 20.5 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 9:00 PM CDT Monday was 20.5 feet. - Forecast...The river is expected to rise to a crest of 20.7 feet early tomorrow afternoon. - Flood stage is 20.0 feet.
Severity:  Severe    Effective:  April 20, 2026, 9:30 pm      Expires:  April 22, 2026, 9:30 am
Area:  Jersey, IL; St. Charles, MO


Flood Warning issued April 20 at 9:28PM CDT until April 28 at 10:00AM CDT by NWS Quad Cities IA IL

Summary: ...The Flood Warning continues for the following rivers in Iowa... Illinois...Missouri... Mississippi River at Ill. City LD16 affecting Rock Island and Muscatine Counties. Mississippi River at Rock Island LD15 affecting Rock Island, Muscatine and Scott Counties. Mississippi River at Muscatine affecting Rock Island, Muscatine, Louisa and Mercer Counties. Mississippi River at Gregory Landing affecting Hancock and Clark Counties. Mississippi River at New Boston LD17 affecting Louisa and Mercer Counties. Mississippi River at Keithsburg affecting Henderson, Louisa, Mercer and Des Moines Counties. Mississippi River at Burlington affecting Hancock, Lee, Henderson and Des Moines Counties. Mississippi River at Gladstone LD18 affecting Henderson and Des Moines Counties. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Mississippi River at Ill. City LD16. * WHEN...Until Tuesday, April 28. * IMPACTS...At 16.0 feet, Water affects the park at Andalusia. * ADDITIONAL DETAILS... - At 9:00 PM CDT Monday the stage was 15.0 feet and rising. - Forecast...The river is expected to rise to a crest of 15.8 feet Thursday evening. It will then fall below flood stage Monday, April 27. - Flood stage is 15.0 feet.
Severity:  Severe    Effective:  April 20, 2026, 9:28 pm      Expires:  April 21, 2026, 9:30 pm
Area:  Muscatine, IA; Rock Island, IL


Flood Warning issued April 20 at 9:28PM CDT by NWS Quad Cities IA IL

Summary: ...The Flood Warning continues for the following rivers in Iowa... Illinois...Missouri... Mississippi River at Ill. City LD16 affecting Rock Island and Muscatine Counties. Mississippi River at Rock Island LD15 affecting Rock Island, Muscatine and Scott Counties. Mississippi River at Muscatine affecting Rock Island, Muscatine, Louisa and Mercer Counties. Mississippi River at Gregory Landing affecting Hancock and Clark Counties. Mississippi River at New Boston LD17 affecting Louisa and Mercer Counties. Mississippi River at Keithsburg affecting Henderson, Louisa, Mercer and Des Moines Counties. Mississippi River at Burlington affecting Hancock, Lee, Henderson and Des Moines Counties. Mississippi River at Gladstone LD18 affecting Henderson and Des Moines Counties. * WHAT...Moderate flooding is occurring and moderate flooding is forecast. * WHERE...Mississippi River at Keithsburg. * WHEN...Until further notice. * IMPACTS...At 16.0 feet, Water is over the campground and boat ramp in Keithsburg. * ADDITIONAL DETAILS... - At 8:30 PM CDT Monday the stage was 15.6 feet and rising. - Forecast...The river is expected to rise to a crest of 15.9 feet Wednesday evening. - Flood stage is 14.0 feet.
Severity:  Severe    Effective:  April 20, 2026, 9:28 pm      Expires:  April 21, 2026, 9:30 pm
Area:  Des Moines, IA; Louisa, IA; Henderson, IL; Mercer, IL


Flood Warning issued April 20 at 9:28PM CDT by NWS Quad Cities IA IL

Summary: ...The Flood Warning continues for the following rivers in Iowa... Illinois...Missouri... Mississippi River at Ill. City LD16 affecting Rock Island and Muscatine Counties. Mississippi River at Rock Island LD15 affecting Rock Island, Muscatine and Scott Counties. Mississippi River at Muscatine affecting Rock Island, Muscatine, Louisa and Mercer Counties. Mississippi River at Gregory Landing affecting Hancock and Clark Counties. Mississippi River at New Boston LD17 affecting Louisa and Mercer Counties. Mississippi River at Keithsburg affecting Henderson, Louisa, Mercer and Des Moines Counties. Mississippi River at Burlington affecting Hancock, Lee, Henderson and Des Moines Counties. Mississippi River at Gladstone LD18 affecting Henderson and Des Moines Counties. * WHAT...Moderate flooding is occurring and moderate flooding is forecast. * WHERE...Mississippi River at Gladstone LD18. * WHEN...Until further notice. * ADDITIONAL DETAILS... - At 9:00 PM CDT Monday the stage was 12.4 feet and rising. - Forecast...The river is expected to rise to a crest of 12.6 feet Wednesday evening. - Flood stage is 10.0 feet.
Severity:  Severe    Effective:  April 20, 2026, 9:28 pm      Expires:  April 21, 2026, 9:30 pm
Area:  Des Moines, IA; Henderson, IL


Flood Warning issued April 20 at 9:28PM CDT by NWS Quad Cities IA IL

Summary: ...The Flood Warning continues for the following rivers in Iowa... Illinois...Missouri... Mississippi River at Ill. City LD16 affecting Rock Island and Muscatine Counties. Mississippi River at Rock Island LD15 affecting Rock Island, Muscatine and Scott Counties. Mississippi River at Muscatine affecting Rock Island, Muscatine, Louisa and Mercer Counties. Mississippi River at Gregory Landing affecting Hancock and Clark Counties. Mississippi River at New Boston LD17 affecting Louisa and Mercer Counties. Mississippi River at Keithsburg affecting Henderson, Louisa, Mercer and Des Moines Counties. Mississippi River at Burlington affecting Hancock, Lee, Henderson and Des Moines Counties. Mississippi River at Gladstone LD18 affecting Henderson and Des Moines Counties. * WHAT...Moderate flooding is occurring and moderate flooding is forecast. * WHERE...Mississippi River at Burlington. * WHEN...Until further notice. * IMPACTS...At 17.5 feet, Water affects Riverview Drive in Riverview Park in Fort Madison. * ADDITIONAL DETAILS... - At 9:00 PM CDT Monday the stage was 17.1 feet and rising. - Forecast...The river is expected to rise to a crest of 17.3 feet Wednesday morning. - Flood stage is 15.0 feet.
Severity:  Severe    Effective:  April 20, 2026, 9:28 pm      Expires:  April 21, 2026, 9:30 pm
Area:  Des Moines, IA; Lee, IA; Hancock, IL; Henderson, IL


Flood Warning issued April 20 at 9:28PM CDT by NWS Quad Cities IA IL

Summary: ...The Flood Warning continues for the following rivers in Iowa... Illinois...Missouri... Mississippi River at Ill. City LD16 affecting Rock Island and Muscatine Counties. Mississippi River at Rock Island LD15 affecting Rock Island, Muscatine and Scott Counties. Mississippi River at Muscatine affecting Rock Island, Muscatine, Louisa and Mercer Counties. Mississippi River at Gregory Landing affecting Hancock and Clark Counties. Mississippi River at New Boston LD17 affecting Louisa and Mercer Counties. Mississippi River at Keithsburg affecting Henderson, Louisa, Mercer and Des Moines Counties. Mississippi River at Burlington affecting Hancock, Lee, Henderson and Des Moines Counties. Mississippi River at Gladstone LD18 affecting Henderson and Des Moines Counties. * WHAT...Moderate flooding is occurring and moderate flooding is forecast. * WHERE...Mississippi River at New Boston LD17. * WHEN...Until further notice. * IMPACTS...At 18.1 feet, Lock and Dam 17 is closed. * ADDITIONAL DETAILS... - At 9:10 PM CDT Monday the stage was 16.5 feet and rising. - Forecast...The river is expected to rise to a crest of 17.2 feet Friday morning. - Flood stage is 15.0 feet.
Severity:  Severe    Effective:  April 20, 2026, 9:28 pm      Expires:  April 21, 2026, 9:30 pm
Area:  Louisa, IA; Mercer, IL


Flood Warning issued April 20 at 9:28PM CDT by NWS Quad Cities IA IL

Summary: ...The Flood Warning continues for the following rivers in Iowa... Illinois...Missouri... Mississippi River at Ill. City LD16 affecting Rock Island and Muscatine Counties. Mississippi River at Rock Island LD15 affecting Rock Island, Muscatine and Scott Counties. Mississippi River at Muscatine affecting Rock Island, Muscatine, Louisa and Mercer Counties. Mississippi River at Gregory Landing affecting Hancock and Clark Counties. Mississippi River at New Boston LD17 affecting Louisa and Mercer Counties. Mississippi River at Keithsburg affecting Henderson, Louisa, Mercer and Des Moines Counties. Mississippi River at Burlington affecting Hancock, Lee, Henderson and Des Moines Counties. Mississippi River at Gladstone LD18 affecting Henderson and Des Moines Counties. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Mississippi River at Muscatine. * WHEN...Until further notice. * IMPACTS...At 18.0 feet, Water affects most of the Riverside Park parking lot. * ADDITIONAL DETAILS... - At 8:15 PM CDT Monday the stage was 16.7 feet and rising. - Forecast...The river is expected to rise to a crest of 17.6 feet early Friday morning. - Flood stage is 16.0 feet.
Severity:  Severe    Effective:  April 20, 2026, 9:28 pm      Expires:  April 21, 2026, 9:30 pm
Area:  Louisa, IA; Muscatine, IA; Mercer, IL; Rock Island, IL


Flood Warning issued April 20 at 9:28PM CDT by NWS Quad Cities IA IL

Summary: ...The Flood Warning continues for the following rivers in Iowa... Illinois...Missouri... Mississippi River at Ill. City LD16 affecting Rock Island and Muscatine Counties. Mississippi River at Rock Island LD15 affecting Rock Island, Muscatine and Scott Counties. Mississippi River at Muscatine affecting Rock Island, Muscatine, Louisa and Mercer Counties. Mississippi River at Gregory Landing affecting Hancock and Clark Counties. Mississippi River at New Boston LD17 affecting Louisa and Mercer Counties. Mississippi River at Keithsburg affecting Henderson, Louisa, Mercer and Des Moines Counties. Mississippi River at Burlington affecting Hancock, Lee, Henderson and Des Moines Counties. Mississippi River at Gladstone LD18 affecting Henderson and Des Moines Counties. * WHAT...Minor flooding is occurring and moderate flooding is forecast. * WHERE...Mississippi River at Rock Island LD15. * WHEN...Until further notice. * IMPACTS...At 16.0 feet, Water affects sidewalks along the river at Le Claire Park. Water also affects Credit Island Lane and Moline's River Drive in the 4700 block. * ADDITIONAL DETAILS... - At 9:00 PM CDT Monday the stage was 15.3 feet and rising. - Forecast...The river is expected to rise to a crest of 16.0 feet Thursday evening. - Flood stage is 15.0 feet.
Severity:  Severe    Effective:  April 20, 2026, 9:28 pm      Expires:  April 21, 2026, 9:30 pm
Area:  Muscatine, IA; Scott, IA; Rock Island, IL


Flood Warning issued April 20 at 9:28PM CDT by NWS Quad Cities IA IL

Summary: ...The Flood Warning continues for the following rivers in Iowa... Illinois...Missouri... Mississippi River at Ill. City LD16 affecting Rock Island and Muscatine Counties. Mississippi River at Rock Island LD15 affecting Rock Island, Muscatine and Scott Counties. Mississippi River at Muscatine affecting Rock Island, Muscatine, Louisa and Mercer Counties. Mississippi River at Gregory Landing affecting Hancock and Clark Counties. Mississippi River at New Boston LD17 affecting Louisa and Mercer Counties. Mississippi River at Keithsburg affecting Henderson, Louisa, Mercer and Des Moines Counties. Mississippi River at Burlington affecting Hancock, Lee, Henderson and Des Moines Counties. Mississippi River at Gladstone LD18 affecting Henderson and Des Moines Counties. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Mississippi River at Gregory Landing. * WHEN...Until further notice. * IMPACTS...At 16.0 feet, Water affects buildings in unprotected low areas. * ADDITIONAL DETAILS... - At 9:00 PM CDT Monday the stage was 16.1 feet steady. - Recent Activity...The river is currently undergoing a broad crest. - Forecast...The river is expected to fall to 15.6 feet Monday, April 27. - Flood stage is 15.0 feet.
Severity:  Severe    Effective:  April 20, 2026, 9:28 pm      Expires:  April 21, 2026, 9:30 pm
Area:  Hancock, IL; Clark, MO


Flood Warning issued April 20 at 9:26PM CDT by NWS Milwaukee/Sullivan WI

Summary: ...The Flood Warning is extended for the following rivers in Wisconsin... Fox River Lower At Waukesha affecting Waukesha County. ...The Flood Warning continues for the following rivers in Wisconsin...Illinois... Fox River Lower Near New Munster affecting Kenosha and Lake Counties. * WHAT...Major flooding is occurring and major flooding is forecast. * WHERE...Fox River Lower near New Munster. * WHEN...Until further notice. * IMPACTS...At 15.0 feet, Highway 50 is closed due to floodwaters over the highway. There is widespread flooding in the Town of Wheatland and Village of Salem Lakes. Floodwaters are into the lower levels of some homes in those areas along Riverside Drive, Shorewood Drive, 101st Street and Shorewood Terrace. * ADDITIONAL DETAILS... - At 8:00 PM CDT Monday the stage was 14.7 feet. - Bankfull stage is 10.0 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 8:00 PM CDT Monday was 15.0 feet. - Forecast...The river is expected to gradually fall to moderate flood Tuesday night and then minor flood later Thursday. - Flood stage is 11.0 feet. - Flood History...This crest compares to a previous crest of 14.5 feet on 04/20/2013. - http://www.weather.gov/safety/flood
Severity:  Severe    Effective:  April 20, 2026, 9:26 pm      Expires:  April 21, 2026, 9:30 am
Area:  Lake, IL; Kenosha, WI


Flood Warning issued April 20 at 9:24PM CDT by NWS Lincoln IL

Summary: ...The Flood Warning continues for the following rivers in Illinois... Illinois River at Peoria affecting Peoria, Tazewell and Woodford Counties. Illinois River near Havana affecting Mason, Cass and Fulton Counties. Illinois River at Beardstown affecting Morgan, Brown, Cass and Schuyler Counties. .The following forecasts are based on observed precipitation, soil moisture conditions, and forecast precipitation. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Illinois River at Beardstown. * WHEN...Until further notice. * IMPACTS...At 18.0 feet, Seepage problems begin in the Lost Creek Drainage and Levee District. * ADDITIONAL DETAILS... - At 8:45 PM CDT Monday the stage was 16.3 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 8:45 PM CDT Monday was 16.3 feet. - Forecast...The river is expected to rise to a crest of 16.5 feet tomorrow morning. - Flood stage is 14.0 feet. - http://www.weather.gov/safety/flood
Severity:  Severe    Effective:  April 20, 2026, 9:24 pm      Expires:  April 21, 2026, 1:30 pm
Area:  Brown, IL; Cass, IL; Morgan, IL; Schuyler, IL


Flood Warning issued April 20 at 9:24PM CDT by NWS Lincoln IL

Summary: ...The Flood Warning continues for the following rivers in Illinois... Illinois River at Peoria affecting Peoria, Tazewell and Woodford Counties. Illinois River near Havana affecting Mason, Cass and Fulton Counties. Illinois River at Beardstown affecting Morgan, Brown, Cass and Schuyler Counties. .The following forecasts are based on observed precipitation, soil moisture conditions, and forecast precipitation. * WHAT...Minor flooding is occurring and moderate flooding is forecast. * WHERE...Illinois River near Havana. * WHEN...Until further notice. * ADDITIONAL DETAILS... - At 8:45 PM CDT Monday the stage was 16.3 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 8:45 PM CDT Monday was 16.3 feet. - Forecast...The river is expected to rise to a crest of 17.0 feet Thursday evening. - Flood stage is 14.0 feet. - http://www.weather.gov/safety/flood
Severity:  Severe    Effective:  April 20, 2026, 9:24 pm      Expires:  April 21, 2026, 1:30 pm
Area:  Cass, IL; Fulton, IL; Mason, IL


Flood Warning issued April 20 at 9:24PM CDT until April 24 at 1:00AM CDT by NWS Lincoln IL

Summary: ...The Flood Warning continues for the following rivers in Illinois... Illinois River at Peoria affecting Peoria, Tazewell and Woodford Counties. Illinois River near Havana affecting Mason, Cass and Fulton Counties. Illinois River at Beardstown affecting Morgan, Brown, Cass and Schuyler Counties. .The following forecasts are based on observed precipitation, soil moisture conditions, and forecast precipitation. * WHAT...Minor flooding is forecast. * WHERE...Illinois River at Peoria. * WHEN...From Tuesday evening to early Friday morning. * IMPACTS...At 18.0 feet, Some flooding begins to bottomland not protected by levees. * ADDITIONAL DETAILS... - At 8:45 PM CDT Monday the stage was 17.6 feet. - Forecast...The river is expected to rise above flood stage tomorrow evening to a crest of 18.1 feet Wednesday morning. It will then fall below flood stage Thursday evening. - Flood stage is 18.0 feet. - http://www.weather.gov/safety/flood
Severity:  Severe    Effective:  April 20, 2026, 9:24 pm      Expires:  April 21, 2026, 1:30 pm
Area:  Peoria, IL; Tazewell, IL; Woodford, IL


Flood Warning issued April 20 at 9:08PM CDT by NWS Chicago IL

Summary: ...The Flood Warning continues for the following rivers in Illinois... Des Plaines River at Lincolnshire affecting Cook and Lake IL Counties. Des Plaines River near Des Plaines affecting Cook County. Des Plaines River near Russell affecting Lake IL County. Des Plaines River near Gurnee affecting Lake IL County. * WHAT...Moderate flooding is occurring and forecasted to continue. * WHERE...Des Plaines River from IL/WI state line downstream to US-41 in Gurnee, including the Russell gauge. * WHEN...Until further notice. * IMPACTS...At 9.5 feet, Residential structures threatened along Russell Road between the river and Kilbourne Road. Industrial parking lots threatened along Kilbourne Road. * ADDITIONAL DETAILS... - At 8:30 PM CDT Monday the stage was 9.2 feet. - Forecast...The river will continue to slowly fall throughout the week. - Flood stage is 7.0 feet. - http://www.weather.gov/safety/flood
Severity:  Severe    Effective:  April 20, 2026, 9:08 pm      Expires:  April 21, 2026, 3:15 pm
Area:  Lake, IL


Flood Warning issued April 20 at 9:08PM CDT by NWS Chicago IL

Summary: ...The Flood Warning continues for the following rivers in Illinois... Des Plaines River at Lincolnshire affecting Cook and Lake IL Counties. Des Plaines River near Des Plaines affecting Cook County. Des Plaines River near Russell affecting Lake IL County. Des Plaines River near Gurnee affecting Lake IL County. * WHAT...Moderate flooding is occurring and forecasted to continue. * WHERE...Des Plaines River from Townline Road in Libertyville downstream to Palatine Road in Prospect Heights, including the Lincolnshire gauge. * WHEN...Until further notice. * IMPACTS...At 15.0 feet, Structures threatened along IL-22 (Half-Day Road) just east of the river. Multiple structures threatened near and west of US-45 (Milwaukee Avenue) and Deerfield Road. Deerfield Road threatened near the river. Multiple trails inundated in Half-Day Forest Preserve. * ADDITIONAL DETAILS... - At 8:45 PM CDT Monday the stage was 15.1 feet. - Forecast...The river has crested, and now will gradually fall through the week. - Flood stage is 12.5 feet. - http://www.weather.gov/safety/flood
Severity:  Severe    Effective:  April 20, 2026, 9:08 pm      Expires:  April 21, 2026, 3:15 pm
Area:  Cook, IL; Lake, IL


Flood Warning issued April 20 at 9:08PM CDT by NWS Chicago IL

Summary: ...The Flood Warning continues for the following rivers in Illinois... Des Plaines River at Lincolnshire affecting Cook and Lake IL Counties. Des Plaines River near Des Plaines affecting Cook County. Des Plaines River near Russell affecting Lake IL County. Des Plaines River near Gurnee affecting Lake IL County. * WHAT...Moderate flooding is occurring and forecasted to continue. * WHERE...Des Plaines River from US-41 in Gurnee downstream to Townline Road in Vernon Hills, including the Gurnee gauge. * WHEN...Until further notice. * IMPACTS...At 10.0 feet, Residences threatened along Kilbourne Road and near O'Plaine Road and McClure Avenue in Gurnee. Businesses threatened along Old Grand Avenue near IL-132 in Gurnee. IL-132 (Grand Avenue) is threatened east of the river in Gurnee. * ADDITIONAL DETAILS... - At 8:30 PM CDT Monday the stage was 10.4 feet. - Forecast...The river will continue to gradually fall through the week. - Flood stage is 7.0 feet. - http://www.weather.gov/safety/flood
Severity:  Severe    Effective:  April 20, 2026, 9:08 pm      Expires:  April 21, 2026, 3:15 pm
Area:  Lake, IL


Flood Warning issued April 20 at 9:08PM CDT by NWS Chicago IL

Summary: ...The Flood Warning continues for the following rivers in Illinois... Des Plaines River at Lincolnshire affecting Cook and Lake IL Counties. Des Plaines River near Des Plaines affecting Cook County. Des Plaines River near Russell affecting Lake IL County. Des Plaines River near Gurnee affecting Lake IL County. * WHAT...Moderate flooding is occurring and forecasted to continue. * WHERE...Des Plaines River from Palatine Road in Prospect Heights downstream to Irving Park Road in Chicago, including the Des Plaines gauge. * WHEN...Until further notice. * IMPACTS...At 18.5 feet, Big Bend Road threatened in Des Plaines. * ADDITIONAL DETAILS... - At 8:45 PM CDT Monday the stage was 18.0 feet. - Forecast...The river is currently cresting. It will begin a slow fall starting tomorrow. - Flood stage is 15.0 feet. - http://www.weather.gov/safety/flood
Severity:  Severe    Effective:  April 20, 2026, 9:08 pm      Expires:  April 21, 2026, 3:15 pm
Area:  Cook, IL


Flood Warning issued April 20 at 9:04PM CDT by NWS Chicago IL

Summary: ...The Flood Warning continues for the following rivers in Illinois... Fox River at Montgomery affecting Kane and Kendall Counties. Fox River at Algonquin Lock & Dam tailwater affecting Kane, McHenry and Lake IL Counties. * WHAT...Minor flooding is occurring and forecasted to continue. * WHERE...Fox River from Red Gate Road in St. Charles downstream to Millington, including the Montgomery gauge. * WHEN...Until further notice. * IMPACTS...At 13.5 feet, Low-lying parking lots at city hall and Boy Scout Island are threatened in St. Charles. Fox River Trail is threatened at St. Mary Park in St. Charles. * ADDITIONAL DETAILS... - At 8:00 PM CDT Monday the stage was 13.6 feet. - Forecast...The river is expected to remain nearly steady until further notice. - Flood stage is 13.5 feet. - http://www.weather.gov/safety/flood
Severity:  Severe    Effective:  April 20, 2026, 9:04 pm      Expires:  April 21, 2026, 3:15 pm
Area:  Kane, IL; Kendall, IL


Flood Warning issued April 20 at 9:04PM CDT by NWS Chicago IL

Summary: ...The Flood Warning continues for the following rivers in Illinois... Fox River at Montgomery affecting Kane and Kendall Counties. Fox River at Algonquin Lock & Dam tailwater affecting Kane, McHenry and Lake IL Counties. * WHAT...Moderate flooding is occurring and major flooding is forecasted. * 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. * ADDITIONAL DETAILS... - At 8:30 PM CDT Monday the stage was 11.8 feet. - Forecast...The river is expected to continue slowly rising through the week. It is expected to reach Major flood stage at some point Wednesday night into Thursday. - Flood stage is 9.5 feet. - http://www.weather.gov/safety/flood
Severity:  Severe    Effective:  April 20, 2026, 9:04 pm      Expires:  April 21, 2026, 3:15 pm
Area:  Kane, IL; Lake, IL; McHenry, IL


Flood Warning issued April 20 at 9:01PM CDT by NWS Chicago IL

Summary: ...The Flood Warning continues for the following rivers in Illinois... Illinois River at La Salle affecting La Salle, Bureau and Putnam Counties. * WHAT...Minor flooding is occurring and forecasted to continue. * WHERE...Illinois River from Starved Rock Lock and Dam downstream to confluence with Big Bureau Creek, including the La Salle gauge. * WHEN...Until further notice. * IMPACTS...At 22.0 feet, Lower parking lot at Starved Rock State Park is inundated east of La Salle. High water levels begin to impact shipping interests along the river. * ADDITIONAL DETAILS... - At 8:45 PM CDT Monday the stage was 21.1 feet. - Forecast...The river is expected to only gradually fall through the week. It may fall below flood stage by the end of this week. - Flood stage is 20.0 feet. - http://www.weather.gov/safety/flood
Severity:  Severe    Effective:  April 20, 2026, 9:01 pm      Expires:  April 21, 2026, 3:15 pm
Area:  Bureau, IL; La Salle, IL; Putnam, IL


Flood Warning issued April 20 at 8:58PM CDT by NWS Chicago IL

Summary: ...The Flood Warning is extended for the following rivers in Illinois... Rock River at Byron affecting Ogle County. ...The Flood Warning continues for the following rivers in Illinois... Rock River at Rockton affecting Winnebago County. Rock River at Latham Park affecting Winnebago County. * WHAT...Moderate flooding is occurring and forecasted to continue. * WHERE...Rock River from Swanson Road in Roscoe downstream to Shorewood Park in Loves Park, including the Latham Park gauge. * WHEN...Until further notice. * IMPACTS...At 11.5 feet, Queen Oaks Drive is threatened in Machesney Park. Lower-level of elevated structures threatened along Harbor Lights Court west of Machesney Park. Ritter Drive is threatened north of Baldwin Drive in Machesney Park. * ADDITIONAL DETAILS... - At 8:30 PM CDT Monday the stage was 11.4 feet. - Forecast...The river is expected to only gradually fall throughout the week. It will remain in Moderate flood stage through at least the end of this week. - Flood stage is 9.0 feet. - http://www.weather.gov/safety/flood
Severity:  Severe    Effective:  April 20, 2026, 8:58 pm      Expires:  April 21, 2026, 3:00 pm
Area:  Winnebago, IL


Flood Warning issued April 20 at 8:58PM CDT by NWS Chicago IL

Summary: ...The Flood Warning is extended for the following rivers in Illinois... Rock River at Byron affecting Ogle County. ...The Flood Warning continues for the following rivers in Illinois... Rock River at Rockton affecting Winnebago County. Rock River at Latham Park affecting Winnebago County. * WHAT...Moderate flooding is occurring and forecasted to continue. * WHERE...Rock River from Confluence with Kishwaukee River to Castle Rock State Park near Oregon, including the Byron gauge. * WHEN...Until further notice. * IMPACTS...At 13.5 feet, Numerous low-lying structures downstream of Byron are flooded. * ADDITIONAL DETAILS... - At 8:15 PM CDT Monday the stage was 14.4 feet. - Forecast...The river is expected to only gradually fall throughout the week. It will remain in Moderate flood stage through at least the end of this week. - Flood stage is 13.0 feet. - http://www.weather.gov/safety/flood
Severity:  Severe    Effective:  April 20, 2026, 8:58 pm      Expires:  April 21, 2026, 3:00 pm
Area:  Ogle, IL


Flood Warning issued April 20 at 8:58PM CDT by NWS Chicago IL

Summary: ...The Flood Warning is extended for the following rivers in Illinois... Rock River at Byron affecting Ogle County. ...The Flood Warning continues for the following rivers in Illinois... Rock River at Rockton affecting Winnebago County. Rock River at Latham Park affecting Winnebago County. * WHAT...Moderate flooding is occurring and forecasted to continue. * WHERE...Rock River from Prairie Hill Road downstream to Swanson Road in Roscoe, including the Rockton gauge. * WHEN...Until further notice. * IMPACTS...At 12.0 feet, Multiple low-lying roads threatened along the river in Roscoe. * ADDITIONAL DETAILS... - At 8:30 PM CDT Monday the stage was 12.2 feet. - Forecast...The river is expected to only gradually fall throughout the week. It will remain in Moderate flood stage through at least the end of this week. - Flood stage is 10.0 feet. - http://www.weather.gov/safety/flood
Severity:  Severe    Effective:  April 20, 2026, 8:58 pm      Expires:  April 21, 2026, 3:00 pm
Area:  Winnebago, IL


Flood Warning issued April 20 at 8:55PM CDT by NWS Chicago IL

Summary: ...The Flood Warning continues for the following rivers in Illinois... Pecatonica River near Shirland affecting Winnebago County. * WHAT...Moderate flooding is occurring and forecasted to continue. * WHERE...Pecatonica River from Winnebago County line downstream to confluence with the Rock River, including the Shirland gauge. * WHEN...Until further notice. * IMPACTS...At 14.0 feet, Structures threatened at Rivers Edge Campground east of Shirland. * ADDITIONAL DETAILS... - At 8:00 PM CDT Monday the stage was 14.1 feet. - Forecast...The river is currently cresting, and will begin falling tomorrow morning. The river is not expected to fall below Flood Stage through at least the end of the week. - Flood stage is 12.0 feet. - http://www.weather.gov/safety/flood
Severity:  Severe    Effective:  April 20, 2026, 8:55 pm      Expires:  April 21, 2026, 3:00 pm
Area:  Winnebago, IL


Flood Warning issued April 20 at 8:54PM CDT by NWS Quad Cities IA IL

Summary: ...The Flood Warning is extended for the following rivers in Illinois... Pecatonica River at Freeport affecting Stephenson County. ...The Flood Warning continues for the following rivers in Illinois... Rock River at Como affecting Whiteside County. Rock River at Moline affecting Rock Island and Henry IL Counties. Rock River near Joslin affecting Rock Island, Henry IL and Whiteside Counties. * WHAT...Moderate flooding is occurring and major flooding is forecast. * WHERE...Rock River at Moline. * WHEN...Until further notice. * IMPACTS...At 14.0 feet, Major Flood Stage. Water affects South Shore Drive and North Shore Drive in Moline west of the 27th Street bridge. Water limits access to homes on South Shore Drive east of the I-74 bridge. Water also affects portions of 60th Street south of John Deere Road. * ADDITIONAL DETAILS... - At 8:30 PM CDT Monday the stage was 13.8 feet rising. - Forecast...The river is expected to rise to a crest of 14.0 feet tomorrow morning. - Flood stage is 12.0 feet.
Severity:  Severe    Effective:  April 20, 2026, 8:54 pm      Expires:  April 21, 2026, 9:00 pm
Area:  Henry, IL; Rock Island, IL


Flood Warning issued April 20 at 8:54PM CDT by NWS Quad Cities IA IL

Summary: ...The Flood Warning is extended for the following rivers in Illinois... Pecatonica River at Freeport affecting Stephenson County. ...The Flood Warning continues for the following rivers in Illinois... Rock River at Como affecting Whiteside County. Rock River at Moline affecting Rock Island and Henry IL Counties. Rock River near Joslin affecting Rock Island, Henry IL and Whiteside Counties. * WHAT...Moderate flooding is occurring and moderate flooding is forecast. * WHERE...Rock River near Joslin. * WHEN...Until further notice. * IMPACTS...At 16.0 feet, Water affects much of Barstow Road between Barstow and Osborn. Water also affects homes in Osborn. * ADDITIONAL DETAILS... - At 7:45 PM CDT Monday the stage was 15.7 feet and rising. - Forecast...The river is expected to rise to a crest of 16.0 feet early tomorrow afternoon. - Flood stage is 12.0 feet.
Severity:  Severe    Effective:  April 20, 2026, 8:54 pm      Expires:  April 21, 2026, 9:00 pm
Area:  Henry, IL; Rock Island, IL; Whiteside, IL


Flood Warning issued April 20 at 8:54PM CDT until April 22 at 9:00PM CDT by NWS Quad Cities IA IL

Summary: ...The Flood Warning is extended for the following rivers in Illinois... Pecatonica River at Freeport affecting Stephenson County. ...The Flood Warning continues for the following rivers in Illinois... Rock River at Como affecting Whiteside County. Rock River at Moline affecting Rock Island and Henry IL Counties. Rock River near Joslin affecting Rock Island, Henry IL and Whiteside Counties. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Rock River at Como. * WHEN...Until late Wednesday evening. * IMPACTS...At 12.8 feet, Water begins to encroach into properties on Regan Road northeast of Como. * ADDITIONAL DETAILS... - At 8:30 PM CDT Monday the stage was 13.3 feet. - Recent Activity...The river is just coming off the crest. - Forecast...The river is expected to fall below flood stage early Wednesday afternoon and continue falling to 10.6 feet Monday, April 27. - Flood stage is 12.5 feet.
Severity:  Severe    Effective:  April 20, 2026, 8:54 pm      Expires:  April 21, 2026, 9:00 pm
Area:  Whiteside, IL


Flood Warning issued April 20 at 8:54PM CDT until April 22 at 3:00AM CDT by NWS Quad Cities IA IL

Summary: ...The Flood Warning is extended for the following rivers in Illinois... Pecatonica River at Freeport affecting Stephenson County. ...The Flood Warning continues for the following rivers in Illinois... Rock River at Como affecting Whiteside County. Rock River at Moline affecting Rock Island and Henry IL Counties. Rock River near Joslin affecting Rock Island, Henry IL and Whiteside Counties. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Pecatonica River at Freeport. * WHEN...Until early Wednesday morning. * IMPACTS...At 13.0 feet, Flood Stage. Water affects low lying sections of Freeport mainly east of the Pecatonica River. * ADDITIONAL DETAILS... - At 8:30 PM CDT Monday the stage was 13.3 feet. - Recent Activity...The river is just coming off the crest. - Forecast...The river is expected to fall below flood stage tomorrow evening and continue falling to 10.5 feet Monday, April 27. - Flood stage is 13.0 feet.
Severity:  Severe    Effective:  April 20, 2026, 8:54 pm      Expires:  April 21, 2026, 9:00 pm
Area:  Stephenson, IL


Flood Warning issued April 20 at 8:43PM CDT by NWS St Louis MO

Summary: ...The Flood Warning continues for the following rivers in Illinois... Illinois River at Hardin. River forecasts are based on observed precipitation and forecast precipitation for the next 24 hours. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Illinois River at Hardin. * WHEN...Until further notice. * IMPACTS...At 25.0 feet, Flood Stage. Lowland flooding of unprotected agricultural land begins. * ADDITIONAL DETAILS... - At 8:30 PM CDT Monday the stage was 26.0 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 8:30 PM CDT Monday was 26.0 feet. - Forecast...The river is expected to rise to a crest of 26.6 feet Wednesday morning. - Flood stage is 25.0 feet.
Severity:  Severe    Effective:  April 20, 2026, 8:43 pm      Expires:  April 22, 2026, 8:45 am
Area:  Calhoun, IL; Greene, IL; Jersey, IL


Flood Warning issued April 20 at 4:39PM CDT until April 29 at 1:00PM CDT by NWS Chicago IL

Summary: * WHAT...Flooding caused by excessive rainfall continues. * WHERE...A portion of northeast Illinois, including the following counties, Lake IL and McHenry. * WHEN...Until further notice. * IMPACTS...Numerous roads, yards, structures, and park land are expected to flood along the Fox River Chain of Lakes. * ADDITIONAL DETAILS... - At 438 PM CDT, River gauges along the Fox River Chain of Lakes indicated water levels continuing to rise slowly. Water levels exceeded moderate flood stage earlier today. The latest forecast from the Illinois Department of Natural Resources indicates that water levels may near major flood stage by the middle of this week. - Water levels are expected to remain above flood stage at least through the middle of next week, assuming no additional rainfall occurs. Impacts from this flood may be similar to those experienced in May of 1973, October of 1986, or June of 2008. - Some locations that will experience flooding include areas along the Fox River Chain of Lakes, including Nippersink Lake, Fox Lake, Pistakee Lake, Petite Lake, Lake Marie, Channel Lake, and Lake Catherine. - http://www.weather.gov/safety/flood
Severity:  Severe    Effective:  April 20, 2026, 4:39 pm      Expires:  April 29, 2026, 1:00 pm
Area:  Lake, IL; McHenry, IL