Hazard Report Provided By forecast.weather.gov

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
1218 PM CDT Fri Apr 17 2026

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-181730-
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-
1218 PM CDT Fri Apr 17 2026 /118 PM EDT Fri Apr 17 2026/

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

.DAY ONE...This Afternoon and Tonight.

Weather hazards expected...

 Significant Thunderstorm Risk...with an associated:
 Level 3 of 5 Damaging Wind Risk...up to 70 mph.
     Level 2 of 5 Tornado Risk.
     Level 1 of 5 Large Hail Risk...up to one inch in diameter.
  Elevated Flooding Risk.


DISCUSSION...

A line of thunderstorms is expected to work across northern
Illinois this evening. Thunderstorms may be severe with damaging
wind gusts, hail, and perhaps a few tornadoes. Heavy rain may
also lead to instances of flash flooding.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Saturday...
  Elevated Frost and  Freeze Risk.
Sunday...
  Significant Frost and Freeze Risk.

.SPOTTER INFORMATION STATEMENT...

  Spotters will likely be needed this evening.

GENERAL STORM MOTION OF THE DAY:

  Moving toward the northeast at 45 mph and then becoming east.

$$

Flood Watch
National Weather Service Chicago IL
1148 AM CDT Fri Apr 17 2026

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-180100-
/O.NEW.KLOT.FA.A.0004.260417T2000Z-260418T1000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
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-
Including the cities of Downers Grove, Ottawa, Oregon, Oak Park,
Palatine, Beecher, Minooka, Oxford, Plano, Morris, Chesterton,
Manhattan, Mundelein, Oak Forest, Belvidere, Lombard, Gurnee,
Mokena, Cicero, Waukegan, Bourbonnais, Fairbury, Chicago, Dwight,
Algonquin, Marseilles, Rockford, Gary, DeKalb, Crete, Plainfield,
Dixon, Channahon, Morocco, Fowler, Kentland, Oswego, Coal City,
Portage, Bradley, Evanston, La Salle, Kankakee, Elgin,
Naperville, Wilmington, Oak Lawn, Streator, La Grange, Mendota,
Valparaiso, Lemont, Pontiac, Roselawn, Woodstock, Watseka, Park
Forest, Bolingbrook, Joliet, Des Plaines, McHenry, Gibson City,
Calumet City, Northbrook, Gilman, Yorkville, Wheaton,
Merrillville, Buffalo Grove, Hammond, Peotone, Rensselaer,
Schaumburg, Byron, Orland Park, Sycamore, Rochelle, Aurora,
DeMotte, Paxton, Carol Stream, and Crystal Lake
1148 AM CDT Fri Apr 17 2026 /1248 PM EDT Fri Apr 17 2026/

...FLOOD WATCH IN EFFECT FROM 3 PM CDT /4 PM EDT/ THIS AFTERNOON
THROUGH LATE TONIGHT...

* WHAT...Flash flooding caused by excessive rainfall is possible.

* WHERE...Portions of Illinois, including the following areas,
  Boone, Central Cook, De Kalb, DuPage, Eastern Will, Ford, Grundy,
  Iroquois, 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, Benton, Jasper, Lake IN, Newton and Porter.

* WHEN...From 3 PM CDT  /4 PM EDT/ this afternoon through late
  tonight.

* IMPACTS...Creeks and streams may rise out of their banks. Ongoing
  river flooding may worsen. Flooding may occur in poor drainage and
  urban areas. Roads and streets may be flooded. Area creeks and
  streams are already elevated, increasing the risk of flooding due
  to additional rainfall.

* ADDITIONAL DETAILS...
  - Locally heavy showers and thunderstorms with rainfall rates
    up to 1 to 2 inches per hour may occur across the area later
    today through the overnight hours. Despite the expected
    relatively fast storm movement, anomalously high atmospheric
    moisture content will support high rainfall rates. In many
    areas, soil moisture remains very high, including areas near
    the Illinois-Wisconsin border where nearly saturated soils
    exist due to recent rainfall. While many areas may see
    lighter accumulations less than 0.5 inches, soils will be
    sensitive to rainfall. Areas near and downstream of heavy
    rainfall, particularly urban areas and locations in far
    northern Illinois, may see flash flooding and river flooding
    impacts, some locally significant.
  - 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.

&&

$$

WSL

Flood Watch
National Weather Service Chicago IL
1104 AM CDT Fri Apr 17 2026

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

  Kankakee River at Dunns Bridge affecting Porter and Jasper
  Counties.

...The Flood Watch continues for the following rivers in Indiana...

  Kankakee River at Shelby affecting Newton and Lake IN Counties.

For the Kankakee River...including Dunns Bridge, Shelby...flooding
is possible.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flood Watch means water levels above flood stage are possible, but
not yet certain, based upon the latest forecasts. Persons along
rivers and streams in the watch area should monitor the latest
forecasts and be prepared to take action should flooding develop.

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.

&&

INZ002-011-181015-
/O.NEW.KLOT.FL.A.0024.260420T0600Z-260424T0000Z/
/DBRI3.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.NO/
1104 AM CDT Fri Apr 17 2026

...FLOOD WATCH IN EFFECT FROM LATE SUNDAY NIGHT TO THURSDAY
EVENING...

* WHAT...Flooding is possible.

* WHERE...Kankakee River from US-421 south of La Crosse downstream
  to IN-49 south of Kouts, including the Dunns Bridge gauge.

* WHEN...From late Sunday night to Thursday evening.

* IMPACTS...At 10.0 feet, Low-lying agricultural land is inundated
  near the river.

* ADDITIONAL DETAILS...
  - At 10:00 AM CDT Friday the stage was 8.6 feet.
  - Forecast...Flood stage may be reached early Monday morning.
  - Flood stage is 10.0 feet.
  - http://www.weather.gov/safety/flood

&&

LAT...LON 4128 8728 4132 8713 4129 8689 4121 8687
      4118 8697 4117 8725

$$

Hazard Report Provided By forecast.weather.gov