Hazard Report Provided By forecast.weather.gov

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
353 PM CDT Fri Jul 3 2026

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-042100-
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-
353 PM CDT Fri Jul 3 2026 /453 PM EDT Fri Jul 3 2026/

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

.DAY ONE...Tonight.

Weather hazards expected...

  Limited Thunderstorm Risk...with an associated:
     Level 2 of 5 Damaging Wind Risk...up to 60 mph.
     Level 1 of 5 Large Hail Risk...up to quarter size.
  Limited Flooding Risk.
  Elevated Excessive Heat Risk south of I-80 this evening.

DISCUSSION...

Scattered thunderstorms are expected this evening into the
overnight hours. The main severe weather threat will be
damaging wind gusts. Heavy rain and localized flash flooding
will also be possible.

Hot and humid conditions will continue through early this
evening with peak heat indices of 100 to 105 south of I-80.

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

Saturday...
  Limited Flooding Risk.
  Limited Thunderstorm Risk...with an associated:
     Level 1 of 5 Severe Thunderstorm Risk.
Sunday...
  Limited Thunderstorm Risk.

.SPOTTER INFORMATION STATEMENT...

Spotters may be needed this evening and tonight.

GENERAL STORM MOTION OF THE DAY:

Moving toward the east at 40 mph.

$$

Flood Advisory
National Weather Service Chicago IL
1251 AM CDT Sat Jul 4 2026

ILC031-043-041700-
/O.NEW.KLOT.FA.Y.0061.260704T0551Z-260704T1700Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Cook IL-DuPage IL-
1251 AM CDT Sat Jul 4 2026

...FLOOD ADVISORY IN EFFECT UNTIL NOON CDT TODAY...

* WHAT...Flooding caused by excessive rainfall is expected to
  continue.

* WHERE...A portion of northeast Illinois, including Cook and DuPage
  counties

* WHEN...Until noon CDT Saturday.

* IMPACTS...Creeks and streams may rise out of their banks. Slow
  moving or standing water may continue.

* ADDITIONAL DETAILS...
  - At 1244 AM CDT, Doppler radar and automated rain gauges
    indicated heavy rainfall had moved out of the area. Up to 2.5
    inches of rain have fallen due to earlier storms. Although no
    additional heavy rainfall is expected during the next several
    hours, multiple streams continue to rise to near flood stage.
    Standing water in some areas may be slow to recede.
  - Some locations that may continue to experience flooding
    include...
    Chicago, Naperville, Cicero, Arlington Heights, Evanston,
    Schaumburg, Skokie, Des Plaines, Berwyn, Mount Prospect,
    Wheaton, Oak Park, Downers Grove, Glenview, Elmhurst,
    Lombard, Ohare Airport, Carol Stream, Park Ridge and Addison.
  - This includes the following rivers and streams...
    The East Branch DuPage River near Lombard, Morton Arboretum,
    and Lisle.
    Salt Creek near Elmhurst, Oak Brook, and Western Springs.
  - http://www.weather.gov/safety/flood

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flood Advisory means minor flooding along waterways and other poor
drainage areas is imminent or may already be occurring. Persons in
the advisory area should use caution and avoid flood waters.

Be especially cautious at night when it is harder to recognize the
dangers of flooding.

&&

LAT...LON 4207 8797 4208 8767 4199 8764 4197 8762
      4196 8762 4195 8762 4193 8762 4191 8770
      4180 8784 4176 8798 4176 8811 4199 8811


$$

WSL

Flood Warning
National Weather Service Chicago IL
1238 AM CDT Sat Jul 4 2026

ILC031-197-INC089-041700-
/O.NEW.KLOT.FA.W.0009.260704T0538Z-260704T1700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Cook IL-Will IL-Lake IN IN-
1238 AM CDT Sat Jul 4 2026

...FLOOD WARNING IN EFFECT UNTIL NOON CDT TODAY...
...REPLACES FLASH FLOOD WARNINGS PREVIOUSLY IN EFFECT...

* WHAT...Flooding caused by excessive rainfall will continue.

* WHERE...Portions of the following counties, Cook, Will, and Lake.

* WHEN...Until noon CDT Saturday.

* IMPACTS...Creeks and streams are expected to rise out of their
  banks. Underpasses may be flooded. Roads and streets may be
  flooded. High water may recede slowly from flooded areas.

* ADDITIONAL DETAILS...
  - At 1235 AM CDT, doppler radar indicated that heavy rainfall
    had moved out of the area. While the threat for heavy
    rainfall has ended, 1 to locally 5 inches of rain fell from
    earlier thunderstorms. Numerous creeks and streams are rising
    towards flood stage, and water levels will likely remain
    elevated well into Saturday morning. Standing water will
    continue to impact underpasses, low spots, and other poor
    drainage areas.
  - A Flash Flood Warning remains in effect for areas that
    received the heaviest rainfall where multiple creeks continue
    to climb rapidly, including the Midlothian, Homewood, and
    Thornton areas.
  - Some locations that will experience flooding include...
    Chicago, Hammond, Gary, Orland Park, Tinley Park, Oak Lawn,
    Calumet City, Chicago Heights, Roseland, Chicago Lawn,
    Englewood, South Shore, East Chicago, Schererville, Lansing,
    Oak Forest, Harvey, New Lenox, Homer Glen and Highland.
  - http://www.weather.gov/safety/flood

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flood Warning means flooding is imminent or may already be
occurring. Persons along rivers, creeks, and other waterways should
take immediate precautions to protect life and property.

Turn around, don`t drown when encountering flooded roads. Most flood
deaths occur in vehicles.

&&

LAT...LON 4184 8759 4181 8757 4179 8756 4179 8755
      4177 8755 4177 8754 4174 8752 4172 8751
      4170 8749 4169 8746 4169 8744 4168 8742
      4147 8741 4147 8753 4142 8753 4141 8798
      4157 8798 4163 8785


$$

Carlaw

Flood Warning
National Weather Service Chicago IL
1226 AM CDT Sat Jul 4 2026

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

  Little Calumet River at Munster (Hohman Avenue) affecting Lake IN
  and Cook Counties.

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 this afternoon.

&&

ILC031-INC089-041800-
/O.NEW.KLOT.FL.W.0051.260704T0526Z-260704T1800Z/
/LCMI3.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.NO/
1226 AM CDT Sat Jul 4 2026

...FLOOD WARNING IN EFFECT FROM EARLY THIS MORNING TO THIS
AFTERNOON...

* WHAT...River flooding is expected.

* WHERE...Little Calumet River from IN-912 in Hammond downstream to
  confluence with Thorn Creek in South Holland, including the
  Munster (Hohman Avenue) gauge.

* WHEN...From early this morning to this afternoon.

* IMPACTS...At 12.5 feet, Most areas outside of the levee-protected
  area are inundated in Hammond and Munster.

* ADDITIONAL DETAILS...
  - At 12:00 AM CDT Saturday the stage was 11.7 feet.
  - Forecast...The river is expected to crest above flood stage
    overnight tonight.
  - Flood stage is 12.0 feet.
  - http://www.weather.gov/safety/flood

&&

LAT...LON 4163 8756 4159 8740 4153 8743 4157 8758


$$

WSL

Flash Flood Statement
National Weather Service Chicago IL
1208 AM CDT Sat Jul 4 2026

ILC031-040645-
/O.CON.KLOT.FF.W.0023.000000T0000Z-260704T0645Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Cook IL-
1208 AM CDT Sat Jul 4 2026

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 145 AM CDT EARLY THIS
MORNING FOR SOUTHEASTERN COOK COUNTY...

At 1208 AM CDT, The heaviest rainfall has ended. However, doppler
radar and automated rain gauges indicate 2 to 5 inches of rain fell
in the warned area due to earlier thunderstorms, with the highest
amounts near Homewood. Additional rainfall amounts up to 0.5 inches
are possible in the warned area. Flash flooding continues in the
warned area with several creeks and streams rising rapidly towards
and above flood stage.

HAZARD...Significant flash flooding.

SOURCE...Radar and automated gauges.

IMPACT...Rapid-onset, significant flooding of creeks, streams,
         drainage ditches, low-lying areas, and poor drainage
         areas. Widespread street and underpass flooding.
         Possible flooding of structures. Possible flooding of
         highways.

Some locations that will experience flash flooding include...
  Chicago, Hammond, Tinley Park, Calumet City, Chicago Heights,
  Lansing, Oak Forest, Harvey, Blue Island, Dolton, Park Forest,
  Homewood, Alsip, Matteson, Frankfort, Steger, South Holland,
  Country Club Hills, South Deering and Midlothian.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don`t drown when encountering flooded roads. Most flood
deaths occur in vehicles.

&&

LAT...LON 4164 8779 4168 8752 4147 8753 4147 8779

FLASH FLOOD...RADAR AND GAUGE INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

Carlaw

Flood Warning
National Weather Service Chicago IL
1139 PM CDT Fri Jul 3 2026

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

  Thorn Creek at Thornton affecting Cook County.

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 Saturday afternoon.

&&

ILC031-042245-
/O.NEW.KLOT.FL.W.0050.260704T0500Z-260705T1200Z/
/THNI2.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.NO/
1139 PM CDT Fri Jul 3 2026

...FLOOD WARNING IN EFFECT UNTIL SUNDAY MORNING...

* WHAT...River flooding due to heavy rainfall.

* WHERE...Thorn Creek from Near Glenwood downstream to confluence
  with Little Calumet River, including the Thornton gauge.

* WHEN...Until Sunday morning.

* IMPACTS...At 8.0 feet, Athletic fields are inundated at Glenwood
  Academy.
  At 9.0 feet, Water begins to be diverted through Thorn Creek
  Diversion Tunnel.

* ADDITIONAL DETAILS...
  - At 11:00 PM CDT Friday the stage was 7.0 feet.
  - Forecast...The creek is expected to crest near or above flood
    stage overnight tonight.
  - Flood stage is 9.0 feet.
  - http://www.weather.gov/safety/flood

&&

LAT...LON 4161 8760 4158 8754 4151 8760 4154 8767


$$

Carlaw

Hazard Report Provided By forecast.weather.gov