Hazard Report Provided By forecast.weather.gov

Coastal Hazard Message
National Weather Service Chicago IL
902 PM CDT Sun Jun 21 2026

ILZ006-103-221015-
/O.CON.KLOT.BH.S.0006.260622T0300Z-260623T0900Z/
Lake IL-Northern Cook-
902 PM CDT Sun Jun 21 2026

...BEACH HAZARDS STATEMENT REMAINS IN EFFECT THROUGH LATE MONDAY
NIGHT...

* WHAT...High wave action and dangerous currents expected at
  Lake Michigan beaches. Waves 4 to 7 ft expected.

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

* WHEN...Through late Monday night.

* IMPACTS...Swimming conditions will be life threatening,
  especially for inexperienced swimmers.

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
1229 AM CDT Mon Jun 22 2026

ILC031-INC089-127-221115-
/O.NEW.KLOT.FA.W.0005.260622T0529Z-260622T1115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Cook IL-Lake IN IN-Porter IN-
1229 AM CDT Mon Jun 22 2026

...FLOOD WARNING IN EFFECT UNTIL 615 AM CDT THIS MORNING...
...REPLACES FLOOD ADVISORY...

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

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

* WHEN...Until 615 AM CDT.

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

* ADDITIONAL DETAILS...
  - At 1221 AM CDT, Doppler radar and automated rain gauges
    indicated between 2 and 2.5 inches of rain have fallen today.
    River gauges on area streams and creeks indicate that
    flooding is ongoing in the warned area as a result of this
    heavy rainfall. This is particularly the case along the
    portions of the Little Calumet, Thorn Creek, Butterfield
    Creek and Hart Ditch.
  - The heavy rainfall is expected to come to an end overnight,
    but area streams and rivers will remain elevated through the
    night.
  - Some locations that will experience flooding include...
    Chicago, Hammond, Gary, Tinley Park, Calumet City, Portage,
    Merrillville, Valparaiso, Chicago Heights, Roseland, East
    Chicago, Schererville, Hobart, Lansing, Oak Forest, Harvey,
    Highland, Blue Island, Munster and Dolton.
  - 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.

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

&&

LAT...LON 4164 8778 4172 8751 4169 8746 4169 8741
      4167 8739 4166 8740 4163 8728 4164 8719
      4166 8714 4166 8710 4172 8695 4172 8692
      4171 8693 4152 8693 4148 8721 4147 8779


$$

Birk

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
859 PM CDT Sun Jun 21 2026

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-230200-
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-
859 PM CDT Sun Jun 21 2026 /959 PM EDT Sun Jun 21 2026/

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

.DAY ONE...Tonight.

Weather hazards expected...

  Limited Flooding Risk.
  High Swim Risk Lake Michigan Beaches.

DISCUSSION...

Localized flooding may persist through the night as rain
gradually ends, particularly along the Interstate 80 corridor from
the southern Chicago metro through northwest Indiana.

Strong onshore winds will cause the threat for rip currents at
southern Lake Michigan beaches to increase through tonight.

.DAYS TWO THROUGH SEVEN...Sunday through Saturday.

Monday...
  High Swim Risk Lake Michigan Beaches.
Wednesday through Saturday...
  Limited Thunderstorm Risk.

DISCUSSION...

An elevated danger for rip currents at southern Lake Michigan
beaches will continue into Monday.

Periodic thunderstorm chances are currently forecasted Wednesday
through Saturday.

.SPOTTER INFORMATION STATEMENT...

  Spotter activation will not be necessary through tonight.

$$

Flood Warning
National Weather Service Chicago IL
843 PM CDT Sun Jun 21 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 Cook
  and Lake IN Counties.

  Thorn Creek at Thornton affecting Cook County.

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 Monday afternoon.

&&

ILC031-INC089-221945-
/O.NEW.KLOT.FL.W.0046.260622T0447Z-260623T0600Z/
/LCMI3.1.ER.260622T0447Z.260622T1200Z.260623T0000Z.NO/
843 PM CDT Sun Jun 21 2026

...FLOOD WARNING IN EFFECT FROM THIS EVENING TO EARLY TUESDAY
MORNING...

* WHAT...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...From late this evening to late Monday evening.

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

* ADDITIONAL DETAILS...
  - At 8:00 PM CDT Sunday the stage was 10.4 feet.
  - Forecast...The river is expected to rise above flood stage
    late this evening to a crest of around 13 feet tomorrow
    morning. It will then fall below flood stage tomorrow
    evening.
  - Flood stage is 12.0 feet.
  - http://www.weather.gov/safety/flood

&&

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


$$

Flood Warning
National Weather Service Chicago IL
843 PM CDT Sun Jun 21 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 Cook
  and Lake IN Counties.

  Thorn Creek at Thornton affecting Cook County.

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 Monday afternoon.

&&

ILC031-221945-
/O.NEW.KLOT.FL.W.0047.260622T0900Z-260623T0200Z/
/THNI2.1.ER.260622T0900Z.260622T1800Z.260622T2000Z.NO/
843 PM CDT Sun Jun 21 2026

...FLOOD WARNING IN EFFECT FROM LATE TONIGHT TO 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...From late tonight to Monday evening.

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

* ADDITIONAL DETAILS...
  - At 8:15 PM CDT Sunday the stage was 5.6 feet.
  - Forecast...The river is expected to rise above flood stage
    late tonight to a crest of just above 9 feet tomorrow morning
    or around midday. It will then fall below flood stage
    tomorrow afternoon.
  - 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