Severe Weather Alerts

Illinois

Flood Warning (Severe)

Winnebago, IL

...The Flood Warning continues for the following rivers in
Wisconsin...Illinois...

Rock River Near Lake Koshkonong affecting Rock and Jefferson
Counties.

Rock River At Fort Atkinson affecting Jefferson County.

Rock River At Afton affecting Winnebago and Rock Counties.

ROCK RIVER near LEBANON-3 E-HWY MM BRIDGE affecting Dodge County.

...The Flood Warning is cancelled for the following rivers in
Wisconsin...

Rock River At Newville affecting Rock County.

* WHAT...Minor flooding is occurring and minor flooding is forecast.

* WHERE...Rock River at Afton.

* WHEN...Until early Thursday morning.

* IMPACTS...At 10.0 feet, Floodwaters affect the property of a home
on South Christian Road on the east side of the river in the Afton
area. Minor erosional flood damage occurs to lowland and
agricultural land adjacent to the river the Afton and Janesville
areas.

* ADDITIONAL DETAILS...
- At 4:00 AM CDT Sunday the stage was 9.7 feet.
- Bankfull stage is 8.0 feet.
- Recent Activity...The maximum river stage in the 24 hours
ending at 4:00 AM CDT Sunday was 9.9 feet.
- Forecast...The river is expected to fall below flood stage
Wednesday evening and continue falling to 8.5 feet Saturday
evening.
- Flood stage is 9.0 feet.
- Flood History...This crest compares to a previous crest of
9.7 feet on 04/11/1922.
- http://www.weather.gov/safety/flood

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Motorists should not attempt to drive around barricades or drive
cars through flooded areas.

Caution is urged when walking near riverbanks.

Additional information is available at www.weather.gov.

The next statement will be issued early this morning at 530 AM CDT.

Start Time
5/3/2026 4:26 AM
End Time
5/3/2026 4:30 PM

Kane, IL; Lake, IL; McHenry, IL

...The Flood Warning continues for the following rivers in
Illinois...

Fox River at Algonquin Lock & Dam tailwater affecting McHenry,
Kane and Lake IL Counties.

* WHAT...Minor flooding is occurring and minor 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 Tuesday morning.

* IMPACTS...At 10.5 feet, Structures threatened along Fox River
Drive in East Dundee. Parking lots threatened in downtown West
Dundee. Low-lying sections of Cornish Park are inundated in
Algonquin. Low-lying sections of Trout Park inundated north of
Elgin.

* ADDITIONAL DETAILS...
- At 6:30 PM CDT Saturday the stage was 10.4 feet.
- Forecast...The river is expected to continue a gradual fall.
- Flood stage is 9.5 feet.
- http://www.weather.gov/safety/flood

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 Sunday afternoon.

Start Time
5/2/2026 7:00 PM
End Time
5/3/2026 1:00 PM

Wisconsin

Flood Warning (Severe)

Rock, WI

...The Flood Warning continues for the following rivers in
Wisconsin...Illinois...

Rock River Near Lake Koshkonong affecting Rock and Jefferson
Counties.

Rock River At Fort Atkinson affecting Jefferson County.

Rock River At Afton affecting Winnebago and Rock Counties.

ROCK RIVER near LEBANON-3 E-HWY MM BRIDGE affecting Dodge County.

...The Flood Warning is cancelled for the following rivers in
Wisconsin...

Rock River At Newville affecting Rock County.

* WHAT...Minor flooding is occurring and minor flooding is forecast.

* WHERE...Rock River at Afton.

* WHEN...Until early Thursday morning.

* IMPACTS...At 10.0 feet, Floodwaters affect the property of a home
on South Christian Road on the east side of the river in the Afton
area. Minor erosional flood damage occurs to lowland and
agricultural land adjacent to the river the Afton and Janesville
areas.

* ADDITIONAL DETAILS...
- At 4:00 AM CDT Sunday the stage was 9.7 feet.
- Bankfull stage is 8.0 feet.
- Recent Activity...The maximum river stage in the 24 hours
ending at 4:00 AM CDT Sunday was 9.9 feet.
- Forecast...The river is expected to fall below flood stage
Wednesday evening and continue falling to 8.5 feet Saturday
evening.
- Flood stage is 9.0 feet.
- Flood History...This crest compares to a previous crest of
9.7 feet on 04/11/1922.
- http://www.weather.gov/safety/flood

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Motorists should not attempt to drive around barricades or drive
cars through flooded areas.

Caution is urged when walking near riverbanks.

Additional information is available at www.weather.gov.

The next statement will be issued early this morning at 530 AM CDT.

Start Time
5/3/2026 4:26 AM
End Time
5/3/2026 4:30 PM

Jefferson, WI; Rock, WI

...The Flood Warning continues for the following rivers in
Wisconsin...Illinois...

Rock River Near Lake Koshkonong affecting Rock and Jefferson
Counties.

Rock River At Fort Atkinson affecting Jefferson County.

Rock River At Afton affecting Winnebago and Rock Counties.

ROCK RIVER near LEBANON-3 E-HWY MM BRIDGE affecting Dodge County.

...The Flood Warning is cancelled for the following rivers in
Wisconsin...

Rock River At Newville affecting Rock County.

* WHAT...Minor flooding is occurring and minor flooding is forecast.

* WHERE...Rock River near Lake Koshkonong.

* WHEN...Until early Wednesday afternoon.

* IMPACTS...At 10.5 feet, Floodwaters reach Oxbow Bend Road in the
area of the gage on the east side of the lake.

* ADDITIONAL DETAILS...
- At 4:00 AM CDT Sunday the stage was 10.4 feet.
- Bankfull stage is 9.0 feet.
- Recent Activity...The maximum river stage in the 24 hours
ending at 4:00 AM CDT Sunday was 10.6 feet.
- Forecast...The river is expected to fall below flood stage
Wednesday morning and continue falling to 9.4 feet Saturday
evening.
- Flood stage is 10.0 feet.
- Flood History...This crest compares to a previous crest of
10.5 feet on 08/30/2007.
- http://www.weather.gov/safety/flood

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Motorists should not attempt to drive around barricades or drive
cars through flooded areas.

Caution is urged when walking near riverbanks.

Additional information is available at www.weather.gov.

The next statement will be issued early this morning at 530 AM CDT.

Start Time
5/3/2026 4:26 AM
End Time
5/3/2026 4:30 PM

Jefferson, WI

...The Flood Warning continues for the following rivers in
Wisconsin...Illinois...

Rock River Near Lake Koshkonong affecting Rock and Jefferson
Counties.

Rock River At Fort Atkinson affecting Jefferson County.

Rock River At Afton affecting Winnebago and Rock Counties.

ROCK RIVER near LEBANON-3 E-HWY MM BRIDGE affecting Dodge County.

...The Flood Warning is cancelled for the following rivers in
Wisconsin...

Rock River At Newville affecting Rock County.

* WHAT...Minor flooding is occurring and minor flooding is forecast.

* WHERE...Rock River at Fort Atkinson.

* WHEN...Until this evening.

* IMPACTS...At 16.0 feet, Floodwaters affect some park land and boat
launches.

* ADDITIONAL DETAILS...
- At 4:00 AM CDT Sunday the stage was 16.0 feet.
- Bankfull stage is 14.5 feet.
- Recent Activity...The maximum river stage in the 24 hours
ending at 4:00 AM CDT Sunday was 16.2 feet.
- Forecast...The river is expected to fall below flood stage
this afternoon and continue falling to 14.6 feet Saturday
evening.
- Flood stage is 16.0 feet.
- Flood History...This crest compares to a previous crest of
16.2 feet on 08/29/2007.
- http://www.weather.gov/safety/flood

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Motorists should not attempt to drive around barricades or drive
cars through flooded areas.

Caution is urged when walking near riverbanks.

Additional information is available at www.weather.gov.

The next statement will be issued early this morning at 530 AM CDT.

Start Time
5/3/2026 4:26 AM
End Time
5/3/2026 4:30 PM

Dodge, WI

...The Flood Warning continues for the following rivers in
Wisconsin...Illinois...

Rock River Near Lake Koshkonong affecting Rock and Jefferson
Counties.

Rock River At Fort Atkinson affecting Jefferson County.

Rock River At Afton affecting Winnebago and Rock Counties.

ROCK RIVER near LEBANON-3 E-HWY MM BRIDGE affecting Dodge County.

...The Flood Warning is cancelled for the following rivers in
Wisconsin...

Rock River At Newville affecting Rock County.

* WHAT...Minor flooding is occurring.

* WHERE...ROCK RIVER near LEBANON-3 E-HWY MM BRIDGE.

* WHEN...Until further notice.

* ADDITIONAL DETAILS...
- At 4:00 AM CDT Sunday the stage was 10.4 feet.
- Bankfull stage is 9.0 feet.
- Recent Activity...The maximum river stage in the 24 hours
ending at 4:00 AM CDT Sunday was 10.5 feet.
- Forecast...No forecast is available for this location.
- Flood stage is 10.0 feet.
- Flood History...This crest compares to a previous crest of
10.4 feet on 12/18/2015.
- http://www.weather.gov/safety/flood

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Motorists should not attempt to drive around barricades or drive
cars through flooded areas.

Caution is urged when walking near riverbanks.

Additional information is available at www.weather.gov.

The next statement will be issued early this morning at 530 AM CDT.

Start Time
5/3/2026 4:26 AM
End Time
5/3/2026 4:30 PM

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