Hazard Report Provided By forecast.weather.gov

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
230 AM CDT Tue Jul 28 2026

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-290730-
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-
230 AM CDT Tue Jul 28 2026 /330 AM EDT Tue Jul 28 2026/

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

.DAY ONE...Today and Tonight.

Weather hazards expected...

  High Swim Risk Lake Michigan Beaches.

DISCUSSION...

Gusty northerly winds will lead to high waves and dangerous
swimming conditions at Lake Michigan beaches beginning late
tonight.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

Friday night and Saturday...
  Elevated Flooding Risk.
  Limited Thunderstorm Risk.
Sunday...
  Limited Thunderstorm Risk.

.SPOTTER INFORMATION STATEMENT...

  Spotter activation will not be necessary through tonight.

$$

Coastal Hazard Message
National Weather Service Chicago IL
1102 AM CDT Tue Jul 28 2026

ILZ006-103-104-INZ001-002-290015-
/O.CON.KLOT.BH.S.0009.000000T0000Z-260729T1500Z/
Lake IL-Northern Cook-Central Cook-Lake IN-Porter-
1102 AM CDT Tue Jul 28 2026

...BEACH HAZARDS STATEMENT REMAINS IN EFFECT THROUGH WEDNESDAY
MORNING...

* WHAT...High wave action and dangerous currents expected at
  Lake Michigan beaches. Waves 7 to 11 ft expected.

* WHERE...In Illinois, Lake, Northern Cook and Central Cook
  Counties. In Indiana, Lake and Porter Counties.

* WHEN...Through Wednesday morning.

* IMPACTS...Swimming conditions will be life threatening,
  especially for inexperienced swimmers. For information on swim
  advisories or bans at Chicago beaches: www. cpdbeaches. com.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain out of the water to avoid dangerous swimming conditions
and do not venture out onto piers, jetties, breakwalls, or other
shoreline structures.

&&

$$

Flood Warning
National Weather Service Chicago IL
756 PM CDT Mon Jul 27 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.

For the Thorn Creek...including Thornton...Minor 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 Tuesday afternoon.

&&

ILC031-281900-
/O.NEW.KLOT.FL.W.0062.260728T0348Z-260728T1951Z/
/THNI2.1.ER.260728T0348Z.260728T0600Z.260728T1350Z.NO/
756 PM CDT Mon Jul 27 2026

...FLOOD WARNING IN EFFECT UNTIL EARLY TUESDAY AFTERNOON...

* WHAT...Minor flooding is forecast.

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

* WHEN...Until early Tuesday afternoon.

* IMPACTS...At 9.0 feet, Water begins to be diverted through Thorn
  Creek Diversion Tunnel.

* ADDITIONAL DETAILS...
  - At 7:45 PM CDT Monday the stage was 8.2 feet.
  - Forecast...The river is expected to rise above flood stage
    late this evening to a crest of 9.6 feet just after midnight
    tonight. It will then fall below flood stage Tuesday morning.
  - Flood stage is 9.0 feet.
  - http://www.weather.gov/safety/flood

&&

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


$$

Hazard Report Provided By forecast.weather.gov