Hazard Report Provided By forecast.weather.gov

Coastal Hazard Message
National Weather Service Chicago IL
322 PM CDT Wed Jun 17 2026

ILZ006-103-104-180430-
/O.CON.KLOT.BH.S.0005.000000T0000Z-260618T0900Z/
Lake IL-Northern Cook-Central Cook-
322 PM CDT Wed Jun 17 2026

...BEACH HAZARDS STATEMENT REMAINS IN EFFECT THROUGH LATE
TONIGHT...

* WHAT...High wave action and dangerous currents expected at Lake
  Michigan beaches. Waves 5 to 8 ft expected.

* WHERE...Lake IL, Northern Cook and Central Cook Counties.

* WHEN...Through late tonight.

* 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 Statement
National Weather Service Chicago IL
806 PM CDT Wed Jun 17 2026

...The Flood Warning continues 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 Thursday afternoon.

&&

ILC031-181915-
/O.EXT.KLOT.FL.W.0045.000000T0000Z-260619T0336Z/
/THNI2.1.ER.260618T0139Z.260618T0600Z.260618T2136Z.NO/
806 PM CDT Wed Jun 17 2026

...FLOOD WARNING NOW IN EFFECT UNTIL LATE TOMORROW EVENING...

* WHAT...Minor flooding is forecast.

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

* WHEN...Until late tomorrow evening.

* IMPACTS...At 11.5 feet, Glenwood Thornton Road threatened north of
  Glenwood.

* ADDITIONAL DETAILS...
  - At 7:45 PM CDT Wednesday the stage was 8.4 feet.
  - Forecast...The river is expected to crest near 12 feet just
    after midnight tonight, then begin a slow fall.
  - Flood stage is 9.0 feet.
  - http://www.weather.gov/safety/flood

&&

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


$$

Ratzer

Flood Statement
National Weather Service Chicago IL
803 PM CDT Wed Jun 17 2026

...The Flood Warning is extended for the following rivers in
Illinois...Indiana...

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

For the Little Calumet River...including Munster (Hohman Avenue)...
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 Thursday afternoon.

&&

ILC031-INC089-181915-
/O.EXT.KLOT.FL.W.0044.000000T0000Z-260619T0000Z/
/LCMI3.1.ER.260617T2221Z.260618T0600Z.260618T1800Z.NO/
803 PM CDT Wed Jun 17 2026

...FLOOD WARNING NOW IN EFFECT UNTIL TOMORROW EVENING...

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

* 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...Until tomorrow evening.

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

* ADDITIONAL DETAILS...
  - At 7:00 PM CDT Wednesday the stage was 12.4 feet.
  - Forecast...The river is expected to crest of near 14 feet
    after midnight tonight.
  - Flood stage is 12.0 feet.
  - http://www.weather.gov/safety/flood

&&

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


$$

Ratzer

Flood Advisory
National Weather Service Chicago IL
702 PM CDT Wed Jun 17 2026

ILC031-INC089-180500-
/O.NEW.KLOT.FA.Y.0044.260618T0002Z-260618T0500Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Cook IL-Lake IN IN-
702 PM CDT Wed Jun 17 2026

...FLOOD ADVISORY IN EFFECT UNTIL MIDNIGHT CDT TONIGHT...

* WHAT...Rivers to remain near bankfull and may result in localized
  flooding near streams and rivers.

* WHERE...Portions of northeast Illinois, including the following
  county, Cook and northwest Indiana, including the following
  county, Lake IN.

* WHEN...Until midnight CDT tonight.

* IMPACTS...Creeks and streams may rise to near bankfull.

* ADDITIONAL DETAILS...
  - At 659 PM CDT, Gauges report rising streams and rivers due to
    earlier heavy rainfall.
  - Some locations that will experience flooding include...
    Hammond, Gary, Tinley Park, Calumet City, Portage,
    Merrillville, Chicago Heights, East Chicago, Schererville,
    Hobart, Lansing, Oak Forest, Harvey, Highland, Munster,
    Dolton, Park Forest, Homewood, Matteson and Frankfort.
  - 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.

&&

LAT...LON 4165 8742 4162 8722 4147 8722 4147 8779
      4155 8779 4162 8769 4164 8759


$$

Yack

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
219 PM CDT Wed Jun 17 2026

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-181930-
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-
219 PM CDT Wed Jun 17 2026 /319 PM EDT Wed Jun 17 2026/

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

.DAY ONE...Tonight.

Weather hazards expected...

  Significant Thunderstorm Risk...with an associated:
     Level 3 of 5 Tornado Risk mainly south of the Kankakee River.
     Level 3 of 5 Damaging Wind Risk...up to 65 mph.
     Level 3 of 5 Large Hail Risk...up to half dollar size.
  Significant Flooding Risk mainly near and south of I-80.
  High Swim Risk Illinois Lake Michigan Beaches.

DISCUSSION...

Thunderstorms are expected this afternoon and early evening. The
strongest storms, currently favored south of the Kankakee River,
will be capable of producing large hail, damaging winds, and
potentially strong tornadoes. Farther north, damaging winds will
be the biggest concern with afternoon storms.

Thunderstorms today will also be capable of producing torrential
rainfall which could lead to localized flash flooding and sudden
river/stream rises.

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

Thursday...
  High Swim Risk Porter County Lake Michigan Beaches.
Saturday...
  Limited Thunderstorm Risk.
Sunday...
  Limited Flooding Risk.
  Limited Thunderstorm Risk.
Monday and Tuesday...
  Limited Thunderstorm Risk.

.SPOTTER INFORMATION STATEMENT...

  Spotters will likely be needed this afternoon and evening.

GENERAL STORM MOTION OF THE DAY:

  Moving toward the east at 50 to 60 mph.

$$

Hazard Report Provided By forecast.weather.gov