Hazard Report Provided By forecast.weather.gov

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
147 AM CDT Wed Apr 15 2026

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-160700-
Winnebago-Boone-McHenry-Lake IL-Ogle-Lee-De Kalb-Kane-DuPage-
La Salle-Kendall-Grundy-Kankakee-Livingston-Iroquois-Ford-
Northern Cook-Central Cook-Southern Cook-Northern Will-
Southern Will-Eastern Will-Lake IN-Porter-Newton-Jasper-Benton-
147 AM CDT Wed Apr 15 2026 /247 AM EDT Wed Apr 15 2026/

This Hazardous Weather Outlook is for portions of north central
Illinois...northeast Illinois and northwest Indiana.

.DAY ONE...Early this Morning through Tonight.

Weather hazards expected...

  Elevated Thunderstorm Risk...with an associated:
     Level 2 of 5 Damaging Wind Risk...up to 70 mph.
     Level 2 of 5 Large Hail Risk...up to Half Dollar size.
     Level 1 of 5 Tornado Risk.
  Elevated Flooding Risk.

DISCUSSION...

Additional waves of thunderstorms are expected at times early
this morning through tonight, some of which could be strong to
severe, especially in the afternoon and evening.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Thursday...
  Limited Thunderstorm Risk.
Friday into early Saturday morning...
  Limited Thunderstorm Risk...with an associated:
     Level 2 of 5 Severe Thunderstorm Risk.
Sunday Night...
  Elevated Frost Risk.

DISCUSSION...

Additional waves of storms are expected at times through the end
of the week.

.SPOTTER INFORMATION STATEMENT...

  Spotters may be needed at times through this evening.

GENERAL STORM MOTION OF THE DAY:

  Moving toward the east at 40 mph.

$$

Flood Watch
National Weather Service Chicago IL
130 PM CDT Wed Apr 15 2026

ILZ003>006-008-010>013-019>021-023-032-103>108-INZ001-002-010-011-
160230-
/O.CON.KLOT.FA.A.0003.000000T0000Z-260416T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Winnebago-Boone-McHenry-Lake IL-Ogle-Lee-De Kalb-Kane-DuPage-La
Salle-Kendall-Grundy-Kankakee-Livingston-Northern Cook-Central
Cook-Southern Cook-Northern Will-Southern Will-Eastern Will-Lake
IN-Porter-Newton-Jasper-
Including the cities of Channahon, Marseilles, Dwight,
Chesterton, Oswego, Rensselaer, Kankakee, Joliet, Orland Park,
Plainfield, Rockford, McHenry, La Salle, Oak Forest, Sycamore,
Carol Stream, Ottawa, Park Forest, Streator, Morris, Evanston, La
Grange, Hammond, Merrillville, Mokena, Portage, Minooka, Oak
Park, Downers Grove, Gary, Algonquin, Yorkville, Oak Lawn, Elgin,
Bolingbrook, Coal City, Crystal Lake, Beecher, Chicago, Morocco,
Mundelein, Bradley, Palatine, Lombard, Crete, Roselawn,
Valparaiso, Northbrook, Lemont, Waukegan, Wilmington, Schaumburg,
Buffalo Grove, Des Plaines, DeMotte, Kentland, Manhattan,
Woodstock, Wheaton, Cicero, Mendota, Naperville, Pontiac, Aurora,
Belvidere, Byron, Dixon, Plano, DeKalb, Fairbury, Rochelle,
Calumet City, Bourbonnais, Gurnee, Peotone, and Oregon
130 PM CDT Wed Apr 15 2026

...FLOOD WATCH REMAINS IN EFFECT UNTIL 1 AM CDT THURSDAY...

* WHAT...Flash flooding caused by excessive rainfall continues to be
  possible.

* WHERE...Portions of Illinois, including the following areas,
  Boone, Central Cook, De Kalb, DuPage, Eastern Will, Grundy, Kane,
  Kankakee, Kendall, La Salle, Lake IL, Lee, Livingston, McHenry,
  Northern Cook, Northern Will, Ogle, Southern Cook, Southern Will
  and Winnebago and northwest Indiana, including the following
  areas, Jasper, Lake IN, Newton and Porter.

* WHEN...Until 1 AM CDT Thursday.

* IMPACTS...Creeks and streams may rise out of their banks. Flooding
  may occur in poor drainage and urban areas. Roads and streets may
  be flooded.

* ADDITIONAL DETAILS...
  - Additional rounds of showers and thunderstorms are expected
    through this evening. Elevated soil moisture due to recent
    rainfall is expected to increase the susceptibility to flash
    flooding.
  - http://www.weather.gov/safety/flood

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flood Watch for flash flooding means rapid-onset flooding is
possible, but not yet certain, based upon the latest forecasts.
Flash flooding is a dangerous situation. Persons with interests
along area rivers, creeks, and other waterways should monitor the
latest forecasts and be prepared to take action should flooding
develop.

&&

$$

Birk

Flood Warning
National Weather Service Chicago IL
1032 AM CDT Wed Apr 15 2026

...The National Weather Service in Chicago IL has issued a Flood
Warning for the following rivers in Illinois...

  Des Plaines River near Des Plaines affecting Cook County.

  Des Plaines River at Lincolnshire affecting Cook and Lake IL
  Counties.

For the Des Plaines River...including Lincolnshire, Des Plaines,
River Forest, Riverside...Moderate flooding is forecast.

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 late tonight.

&&

ILC031-160945-
/O.NEW.KLOT.FL.W.0019.260415T1617Z-000000T0000Z/
/DSPI2.2.ER.260415T1617Z.260417T1200Z.000000T0000Z.NO/
1032 AM CDT Wed Apr 15 2026

...FLOOD WARNING IN EFFECT FROM THIS MORNING UNTIL FURTHER NOTICE...
...REPLACES RIVER FLOOD WATCH...

* WHAT...Moderate flooding is forecast.

* WHERE...Des Plaines River from Palatine Road in Prospect Heights
  downstream to Irving Park Road in Chicago, including the Des
  Plaines gauge.

* WHEN...From this morning until further notice.

* IMPACTS...At 18.5 feet, Big Bend Road threatened in Des Plaines.

* ADDITIONAL DETAILS...
  - At 9:45 AM CDT Wednesday the stage was 14.9 feet.
  - Forecast...The river is expected to rise above flood stage
    late this morning and approach moderate flood stage tomorrow.
  - Flood stage is 15.0 feet.
  - Flood History...This crest compares to a previous crest of
    19.0 feet on 07/04/1938.
  - http://www.weather.gov/safety/flood

&&

LAT...LON 4212 8794 4212 8784 4197 8780 4196 8790


$$

Flood Warning
National Weather Service Chicago IL
1032 AM CDT Wed Apr 15 2026

...The National Weather Service in Chicago IL has issued a Flood
Warning for the following rivers in Illinois...

  Des Plaines River near Des Plaines affecting Cook County.

  Des Plaines River at Lincolnshire affecting Cook and Lake IL
  Counties.

For the Des Plaines River...including Lincolnshire, Des Plaines,
River Forest, Riverside...Moderate flooding is forecast.

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 late tonight.

&&

ILC031-097-160945-
/O.NEW.KLOT.FL.W.0020.260416T0000Z-000000T0000Z/
/LDRI2.2.ER.260416T0000Z.260417T0000Z.000000T0000Z.NO/
1032 AM CDT Wed Apr 15 2026

...FLOOD WARNING IN EFFECT FROM THIS EVENING UNTIL FURTHER NOTICE...
...REPLACES RIVER FLOOD WATCH...

* WHAT...Moderate flooding is forecast.

* WHERE...Des Plaines River from Townline Road in Libertyville
  downstream to Palatine Road in Prospect Heights, including the
  Lincolnshire gauge.

* WHEN...From this evening 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 9:45 AM CDT Wednesday the stage was 11.5 feet.
  - Forecast...The river is expected to rise above flood stage
    this evening and approach flood stage tomorrow morning.
  - Flood stage is 12.5 feet.
  - Flood History...This crest compares to a previous crest of
    15.1 feet on 09/14/2019.
  - http://www.weather.gov/safety/flood

&&

LAT...LON 4224 8797 4224 8788 4212 8784 4212 8794


$$

DK

Hazard Report Provided By forecast.weather.gov